Example1 Example2 0 1 10 1 2 20 2 3 30 3 4 40 4 5 50. 2. Load data. Rather than defining and initializing the variable manually, you can load the data from a file ...Oct 24, 2019 · The fix is easy: define the __file__ variable to the name of the py module you are testing. In the interpreter type: __file__ = 'modulename.py'. Then run the script again. This method has never caused an issue for me. Share. BPO 39513 Nosy @vsajip, @vstinner, @serhiy-storchaka, @tirkarthi Superseder bpo-26789: logging: Trying to log during Python finalization with NameError: name 'open' is not defined Note: these values reflect the state of the issue at the ...NameError is a kind of error in Python that occurs when executing a function, variable, library, or string without quotes that have been typed in the code without any previous Declaration. When the interpreter, upon execution, cannot identify the global or local name throws a NameError.Jan 8, 2019 · 1. global bgcolor does not define, declare, or otherwise create a variable. It simply states that a global variable by that name, not a local variable, should be used. You still need to ensure it is defined before your first use in DISPLAYSURF.fill (bgcolor). Specifically, you need to assign a value to the variable before the first time you ... Jun 13, 2017 · Teams. Q&A for work. Connect and share knowledge within a single location that is structured and easy to search. Learn more about Teams In your case, instead of returning 'edit', it is trying to evaluate the variable name edit, which you have not defined. To solve this, make sure to run your script with Python 3: $ python3 my_script.py. Or, on the off chance that you actually want to use Python 2; raw_input () provides the same functionality as input () does in Python 3.The "NameError: name '__file__' is not defined'" occurs when we use the __file__ global variable in an interactive shell. To solve the error, create a Python script and run the script with the python script_name.py command instead. shell. Traceback (most recent call last): File "<stdin>", line 1, in <module> NameError: name '__file__' is not ...Let’s now look at the above scenarios in detail. The scipy module is not imported. It can happen that you are trying to use the scipy module without even importing it. This is because Python does not recognize the scipy library and its functions until it is imported into the code.You have imported the math module using a different name. How to fix the NameError: name 'math' is not defined? The math library in Python is a built-in module that provides various mathematical operations and functions. It includes functions for basic arithmetic operations, trigonometric functions, logarithmic functions, and more.3 Answers. The recommended way to use MySQL with Django is to install mysqlclient instead of mysql-connector-python. If you use mysql-connector-python, then you need to change the ENGINE to 'mysql.connector.django' in your DATABASES setting ( docs ).3 Answers. Because model has not been defined before using it in the line classes = model.predict (images, batch_size=10). First define a model and then use it, for eg; from sklearn.linear_model import LinearRegression x = 30 * np.random.random ( (20, 1)) y = 0.5 * x + 1.0 + np.random.normal (size=x.shape) model = LinearRegression () model.fit ...Actually, I found the solution to this. If we use the import from __future__ import annotations it will read the file and it won't have that problem, so we can reference different things in the order that we want.I have a Python version 3.3.0 and I am not sure why it does not let me do long for b and m here... I tried to look up the answers on here and but nothing helped...thanks. NameError: global name 'long' is not defined power = long (b) % long (m) There's no more long. Let it go (BTW, int is the new long)13. So as a full answer: If you use the python package mysqlclient you still need to install the mysql client from Oracle/MySQL. This contains the C-library that the python package uses. To make things more confusing: the python package is in fact written in C for speed increases. To install this library on MacOS:Nov 25, 2021 · NameError: name 'nn' is not defined. 4. Pytorch Error, RuntimeError: expected scalar type Long but found Double. 1. Pytorch - AttributeError: 'tuple' object has no ... I though removing the SELF would have resolved the issue quicker and cleaner, although at this stage I dont really care if the SELF is there or not. In that case how would I define 1) "self._request" 2) def _request (self, method, uri, timeout=5, auth=True, params=None) – hdsouza. Sep 2, 2021 at 14:00. Add a comment.When I type in number in Entry it says name (of Entry) is not defined. I'm very new at programing and this is an school project. In this project I'm trying to make value calculator. marka1=float (marka.get ())*1*3.79 NameError: name 'marka' is not defined. Code:The resulting error was this: NameError: name 'math' is not defined. This happened because the interpreter did not recognize the math keyword. Along with other math methods in Python, we must first import the math module to use it. Here's a fix: import math x = 5.5 print(math.ceil(x)) # 6.Jan 26, 2020 · 1. It has has to do with how you imported the json module. By using the * notation, you are importing everything in the json module. When importing a module in this way, you do not need to specify the module a function came from. When importing, you have two options, import the module (and reference the module name when using it), or import ... NameError: name 'geek' is not defined. 3. Defining variable after usage: In the following example, even though the variable geek is defined in the program, it is defined after its usage. Since Python interprets the code from top to bottom, this will raise NameErrorFeb 1, 2023 · The Python "NameError: name 'plt' is not defined" occurs when we use the pyplot module without importing it first. To solve the error, install matplotlib and import plt (import matplotlib.pyplot as plt) before using it. Open your terminal in your project's root directory and install the matplotlib module. shell. Jan 8, 2019 · 1. global bgcolor does not define, declare, or otherwise create a variable. It simply states that a global variable by that name, not a local variable, should be used. You still need to ensure it is defined before your first use in DISPLAYSURF.fill (bgcolor). Specifically, you need to assign a value to the variable before the first time you ... Jan 7, 2014 · Traceback (most recent call last): File "simple.py", line 4, in <module> class Simple (object): File "simple.py", line 9, in Simple for i in xrange (self.a): NameError: name 'self' is not defined. Python interprets the loop code in the execution scope of the class body. Whatever ends up in the namespace after executing the code in the class ... To fix this error, you can either access pandas using the name that you have used in the import statement or import pandas without an alias. import pandas as pd. # create a dataframe. df = pd.DataFrame( {. 'Name': ['Jim', 'Pam', 'Dwight'], 'Age': [25, 26, 28] }) # display the dataframe. Apr 16, 2022 · 2. TLDR; use this command=app.destroy instead of this command=quito. quit is not defined occurs because the function quito doesn't have access to such variable named quit hence not defined . Assign the command at the quit button to point to app.destroy like so - command=app.destroy that supposed to work because you provide an instance of the ... Reason of the “NameError: name ‘request’ is not defined” in Python. The request is a protocol known as the interaction between the client and server. When talking about the request, we are talking about the HTML request. In the Python programming language, NameError: name ‘request’ is not defined occurs when working with Flask or ...3 Answers. Sorted by: 1. The while loop currently will run forever because the case is always true, newTask == "y". In order to exit the loop newTask needs to be set to something other than "y" causing the case to become false, newTask = "n". On the other hand it appears that your program doesn't need to be within a newTask while loop at all ...Jan 8, 2019 · 1. global bgcolor does not define, declare, or otherwise create a variable. It simply states that a global variable by that name, not a local variable, should be used. You still need to ensure it is defined before your first use in DISPLAYSURF.fill (bgcolor). Specifically, you need to assign a value to the variable before the first time you ... Reloading updates module variables, but does not remove old ones, so if you rename something the old name will still exist. If you change class definitions, existing objects will still have the old type.Jan 14, 2011 · I'd recommend putting a import pdb;pdb.set_trace () first in the InfraPy.py file to make sure you are in the right file, and step through the definition of InfraPy.py to see what is happening. If you don't get a breakpoint, you are importing another file than you think. You can also dir (InfraPy) after importing it, and check which file you are ... Causes of the NameError: name not defined. The following are the most common causes due to which you receive the NameError: name not defined: Misspelled variable or function name. Try to call a variable or function before the declaration. Forget to define a variable. Try to access a local variable. Try to print a single word.In the above traceback, the exception was a NameError, which means that there is a reference to some name (variable, function, class) that hasn’t been defined. In this case, the name referenced is someon. The final line in this case has enough information to help you fix the problem.Teams. Q&A for work. Connect and share knowledge within a single location that is structured and easy to search. Learn more about TeamsAug 2, 2015 · 3 Answers. Sorted by: 1. The while loop currently will run forever because the case is always true, newTask == "y". In order to exit the loop newTask needs to be set to something other than "y" causing the case to become false, newTask = "n". On the other hand it appears that your program doesn't need to be within a newTask while loop at all ... Aug 24, 2020 · NameError: name is not defined. In python, nameerror name is not defined is raised when we try to use the variable or function name which is not valid. Example: value = ['Mango', 'Apple', 'Orange'] print(values) After writing the above code, Ones you will print “ values ” then the error will appear as a “ NameError: name ‘values’ is ... Python NameError: name '' is not defined (though it sure seems like it is) Load 4 more related questions Show fewer related questions Sorted by: Reset to ...A NameError is raised when you try to use a variable or a function name that is not valid. In Python, code runs from top to bottom. This means that you cannot declare a variable after you try to use it in your code.NameError: name 'db' is not defined. Ask Question Asked 3 years, 3 months ago. Modified 3 years, 3 months ago. Viewed 3k times 0 I've made a simple code using python ... 2. TLDR; use this command=app.destroy instead of this command=quito. quit is not defined occurs because the function quito doesn't have access to such variable named quit hence not defined . Assign the command at the quit button to point to app.destroy like so - command=app.destroy that supposed to work because you provide an instance of the ...Jun 9, 2020 · 1 Answer. clear_message () belongs to MainPage class so when calling it inside that class, you need to use self. prefix. Also, you need to use self as a parameter when defining the method since it is a member of a class. def clear_message (self): #self here user_key.delete (0, 'END') psw_key.delete (0, 'END') Additionally, since clear_message ... Nov 25, 2021 · NameError: name 'nn' is not defined. 4. Pytorch Error, RuntimeError: expected scalar type Long but found Double. 1. Pytorch - AttributeError: 'tuple' object has no ... Jun 30, 2022 · NameError: name '_mysql' is not defined after setting change to mysql 3 Django connect mysql problem, NameError: name '_mysql' is not defined NameError: name ‘screen’ is not defined. Did you mean: ‘Screen’? 21st January 2023; ImportError: cannot import name ‘screen’ from ‘turtle’ 21st January 2023; ModuleNotFoundError: No module named ‘Turtle’ 21st January 2023; Python Quiz Code Sachin Vs Virat 2023 21st January 2023; NameError: name ‘Self’ is not defined.You have imported the math module using a different name. How to fix the NameError: name 'math' is not defined? The math library in Python is a built-in module that provides various mathematical operations and functions. It includes functions for basic arithmetic operations, trigonometric functions, logarithmic functions, and more.今回はPythonのNameErrorについて解説します。 1. NameErrorとは 2. NameErrorの対応方法 3. まとめ 関連記事 1. NameErrorとは NameErrorはPythonの組み込み例外の1つで、「名前が見つからなかった」というエラーです。 このエラーは、変数や関数などを参照した…1. Since you installed using pip install nltk, it must have likely installed the latest published version of the code. Seems like there is a bug in the code there, as can be seen in the latest version (3.7) source code here. The issue in version 3.7 is that on line 1680, the function lemma_from_key is being called, but it does not exist.Jun 13, 2017 · Teams. Q&A for work. Connect and share knowledge within a single location that is structured and easy to search. Learn more about Teams The fix is easy: define the __file__ variable to the name of the py module you are testing. In the interpreter type: __file__ = 'modulename.py'. Then run the script again. This method has never caused an issue for me. Share.Oct 15, 2020 · Our code returns [0, 1, 2], which is all the numbers in the range of 0 and 3 (exclusive of 3). The xrange() function returns a list of numbers.. Python 3 removed the xrange() function in favor of a new function called range(). Sep 1, 2023 · Causes of the NameError: name not defined. The following are the most common causes due to which you receive the NameError: name not defined: Misspelled variable or function name. Try to call a variable or function before the declaration. Forget to define a variable. Try to access a local variable. Try to print a single word. Teams. Q&A for work. Connect and share knowledge within a single location that is structured and easy to search. Learn more about Teams I though removing the SELF would have resolved the issue quicker and cleaner, although at this stage I dont really care if the SELF is there or not. In that case how would I define 1) "self._request" 2) def _request (self, method, uri, timeout=5, auth=True, params=None) – hdsouza. Sep 2, 2021 at 14:00. Add a comment.Jul 27, 2020 · 13. So as a full answer: If you use the python package mysqlclient you still need to install the mysql client from Oracle/MySQL. This contains the C-library that the python package uses. To make things more confusing: the python package is in fact written in C for speed increases. To install this library on MacOS: NameError: name 'geek' is not defined. 3. Defining variable after usage: In the following example, even though the variable geek is defined in the program, it is defined after its usage. Since Python interprets the code from top to bottom, this will raise NameErrorJun 30, 2022 · NameError: name '_mysql' is not defined after setting change to mysql 3 Django connect mysql problem, NameError: name '_mysql' is not defined Jun 30, 2022 · NameError: name '_mysql' is not defined after setting change to mysql 3 Django connect mysql problem, NameError: name '_mysql' is not defined You should use raw_input because you are using python-2.7. When you use input () on a variable (for example: s = input ('Name: ') ), it will execute the command ON the Python environment without saving what you wrote on the variable ( s) and create an error if what you wrote is not defined. You should use raw_input because you are using python-2.7. When you use input () on a variable (for example: s = input ('Name: ') ), it will execute the command ON the Python environment without saving what you wrote on the variable ( s) and create an error if what you wrote is not defined.1. Solution: stop copying random code from other places and wonder why it does not work. Instead write code yourself that you do understand. Having globals is very often a very bad idea, particularly if you do not know what you are doing and how to build a somewhat clean application. – luk2302. Sep 21, 2022 at 8:40.Sep 1, 2023 · Causes of the NameError: name not defined. The following are the most common causes due to which you receive the NameError: name not defined: Misspelled variable or function name. Try to call a variable or function before the declaration. Forget to define a variable. Try to access a local variable. Try to print a single word. 1 Answer. clear_message () belongs to MainPage class so when calling it inside that class, you need to use self. prefix. Also, you need to use self as a parameter when defining the method since it is a member of a class. def clear_message (self): #self here user_key.delete (0, 'END') psw_key.delete (0, 'END') Additionally, since clear_message ...You have imported the math module using a different name. How to fix the NameError: name 'math' is not defined? The math library in Python is a built-in module that provides various mathematical operations and functions. It includes functions for basic arithmetic operations, trigonometric functions, logarithmic functions, and more.The above code defines a function named “name” using the keyword “def”. This function is accessed and returns the value “5” successfully. But when we tried to access a sample() function, we encountered the “NameError”, which shows that the “name ‘sample’ is not defined”. This is because this function does not exist in ...I'd recommend putting a import pdb;pdb.set_trace () first in the InfraPy.py file to make sure you are in the right file, and step through the definition of InfraPy.py to see what is happening. If you don't get a breakpoint, you are importing another file than you think. You can also dir (InfraPy) after importing it, and check which file you are ...try: # Python 2 forward compatibility range = xrange except NameError: pass # Python 2 code transformed from range (...) -> list (range (...)) and # xrange (...) -> range (...). The latter is preferable for codebases that want to aim to be Python 3 compatible only in the long run, it is easier to then just use Python 3 syntax whenever possible ...Nov 16, 2015 · So then you'd just want to do: try: a = input () control (a, x, y, z, k) That way, 'a' is initialized before you run the control function. You need to assign values not just to the variable a but also to other variables x, y, z, and k which you're passing here -> control (a, x, y, z, k) # for example: a= 'ADDITION' x= 1 y= 2 z=3 k=4 # and then ... 1. First thing first: always try to avoid using the global keyword. It causes instability i code as it gets longer and complex. Anyways, your code says global is not defined because you don't have the global variable named browser defined outside of the function scopes. Remove the global keyword.You have imported the math module using a different name. How to fix the NameError: name 'math' is not defined? The math library in Python is a built-in module that provides various mathematical operations and functions. It includes functions for basic arithmetic operations, trigonometric functions, logarithmic functions, and more. I'd recommend putting a import pdb;pdb.set_trace () first in the InfraPy.py file to make sure you are in the right file, and step through the definition of InfraPy.py to see what is happening. If you don't get a breakpoint, you are importing another file than you think. You can also dir (InfraPy) after importing it, and check which file you are ...Dec 27, 2022 · Teams. Q&A for work. Connect and share knowledge within a single location that is structured and easy to search. Learn more about Teams In Python 2.x input is basically doing eval (input ()). You can read up on eval here. Basically it tries to evaluate the given expression. Since numbers and strings are expressions themselves, it will try to run your h input as literally h instead of a str. Once again use raw_input () to avoid this in Python 2.x. How to fix NameError: name ‘Y’ is not defined? we use the input () function for user input but input is a string or text, not a code so in our case we need to convert the code Y in to string “Y” then we are able to fix this error, for more clarification please see the above example. For more information Visit Amol Blog Code YouTube Channel.line 37, in <module> for i in word: NameError: name 'word' is not defined. when I try to run this program. Here is the relevant code: def Pig_word0 (word): "" "This is a function which can make string translate to pig latin and first letter become capital." "" # Determined string include a, e, i, o, u or not Prefix = [] for i in word: if i in ...I though removing the SELF would have resolved the issue quicker and cleaner, although at this stage I dont really care if the SELF is there or not. In that case how would I define 1) "self._request" 2) def _request (self, method, uri, timeout=5, auth=True, params=None) – hdsouza. Sep 2, 2021 at 14:00. Add a comment.Jun 7, 2009 · Reloading updates module variables, but does not remove old ones, so if you rename something the old name will still exist. If you change class definitions, existing objects will still have the old type. 1 Answer. clear_message () belongs to MainPage class so when calling it inside that class, you need to use self. prefix. Also, you need to use self as a parameter when defining the method since it is a member of a class. def clear_message (self): #self here user_key.delete (0, 'END') psw_key.delete (0, 'END') Additionally, since clear_message ...I have a Python version 3.3.0 and I am not sure why it does not let me do long for b and m here... I tried to look up the answers on here and but nothing helped...thanks. NameError: global name 'long' is not defined power = long (b) % long (m) There's no more long. Let it go (BTW, int is the new long)Nov 23, 2019 · 1 Answer. In Python 3.x, use int instead of long. PEP 237: Essentially, long renamed to int. That is, there is only one built-in integral type, named int; but it behaves mostly like the old long type. Causes of the NameError: name not defined. The following are the most common causes due to which you receive the NameError: name not defined: Misspelled variable or function name. Try to call a variable or function before the declaration. Forget to define a variable. Try to access a local variable. Try to print a single word.NameError: name 'geek' is not defined. 3. Defining variable after usage: In the following example, even though the variable geek is defined in the program, it is defined after its usage. Since Python interprets the code from top to bottom, this will raise NameErrorAug 2, 2015 · 3 Answers. Sorted by: 1. The while loop currently will run forever because the case is always true, newTask == "y". In order to exit the loop newTask needs to be set to something other than "y" causing the case to become false, newTask = "n". On the other hand it appears that your program doesn't need to be within a newTask while loop at all ... The Python interpreter throws the NameError exception if it encounters an undefined variable or function name. To fix it, you must figure out why the variable is not defined—the most frequent bugs are (1) to use the variable or function name in the code before it was defined, or (2) to misspell the name in either the definition or the usage.NameError: name 'XXX' is not defined. I have a function def viterbi (). One of the input variabless is sequence. Later on in the function I am calling sequence. However, by doing so, it returns: def viterbi (sequence, p_start=None, p_trans=None, p_stop=None, p_emiss=None): length = len (sequence) num_states = len (p_start) best_path ...To fix this error, you can either access pandas using the name that you have used in the import statement or import pandas without an alias. import pandas as pd. # create a dataframe. df = pd.DataFrame( {. 'Name': ['Jim', 'Pam', 'Dwight'], 'Age': [25, 26, 28] }) # display the dataframe. 1. Since you installed using pip install nltk, it must have likely installed the latest published version of the code. Seems like there is a bug in the code there, as can be seen in the latest version (3.7) source code here. The issue in version 3.7 is that on line 1680, the function lemma_from_key is being called, but it does not exist.Teams. Q&A for work. Connect and share knowledge within a single location that is structured and easy to search. Learn more about Teams1 import logging as lg. 3 # log a warning message "Watch out!" ----> 4 logging.warning ('Watch out!') NameError: name 'logging' is not defined. We get a NameError: name 'logging' is not defined. This is because we have imported the logging module with the name lg but we’re trying to use it using the name logging.Feb 1, 2023 · The Python "NameError: name 'plt' is not defined" occurs when we use the pyplot module without importing it first. To solve the error, install matplotlib and import plt (import matplotlib.pyplot as plt) before using it. Open your terminal in your project's root directory and install the matplotlib module. shell. Jun 9, 2020 · 1 Answer. clear_message () belongs to MainPage class so when calling it inside that class, you need to use self. prefix. Also, you need to use self as a parameter when defining the method since it is a member of a class. def clear_message (self): #self here user_key.delete (0, 'END') psw_key.delete (0, 'END') Additionally, since clear_message ...
Let’s now look at the above scenarios in detail. The scipy module is not imported. It can happen that you are trying to use the scipy module without even importing it. This is because Python does not recognize the scipy library and its functions until it is imported into the code.. New hampshire 10 day forecast
Oct 14, 2022 · Saved searches Use saved searches to filter your results more quickly 3 Answers. Sorted by: 1. The while loop currently will run forever because the case is always true, newTask == "y". In order to exit the loop newTask needs to be set to something other than "y" causing the case to become false, newTask = "n". On the other hand it appears that your program doesn't need to be within a newTask while loop at all ...class GameLogic (object): def __init__ (self): self._player = Player (7) class Player (object): def __init__ (self,move_count): self.move_count = move_count. This is not my original code. I simplified my original code to show my mistake. Part of my original code is down below. class GameLogic: def __init__ (self, dungeon_name="game1.txt ...Jun 30, 2022 · NameError: name '_mysql' is not defined after setting change to mysql 3 Django connect mysql problem, NameError: name '_mysql' is not defined You have imported the math module using a different name. How to fix the NameError: name 'math' is not defined? The math library in Python is a built-in module that provides various mathematical operations and functions. It includes functions for basic arithmetic operations, trigonometric functions, logarithmic functions, and more. Example1 Example2 0 1 10 1 2 20 2 3 30 3 4 40 4 5 50. 2. Load data. Rather than defining and initializing the variable manually, you can load the data from a file ...The fix is easy: define the __file__ variable to the name of the py module you are testing. In the interpreter type: __file__ = 'modulename.py'. Then run the script again. This method has never caused an issue for me. Share.Feb 2, 2023 · Traceback (most recent call last): File line 4, in <module> print__age(14) NameError: name 'print__age' is not defined This issue is similar to the previous example but applied to function. Although there is a “print age” function, the function name is print, underscore, and age; however, I used double underscore __ when I called the function. Jul 27, 2022 · 今回はPythonのNameErrorについて解説します。 1. NameErrorとは 2. NameErrorの対応方法 3. まとめ 関連記事 1. NameErrorとは NameErrorはPythonの組み込み例外の1つで、「名前が見つからなかった」というエラーです。 このエラーは、変数や関数などを参照した… Oct 15, 2020 · Our code returns [0, 1, 2], which is all the numbers in the range of 0 and 3 (exclusive of 3). The xrange() function returns a list of numbers.. Python 3 removed the xrange() function in favor of a new function called range(). Feb 1, 2023 · To solve the error, we have to import the random module. main.py. # import random module first import random n1 = random.randint(1, 10) print(n1) s1 = random.choice(['a', 'b', 'c']) print(s1) Even though the random module is in the Python standard library, we still have to import it before using it. Make sure you haven't used a capital letter r ... NameError: name ‘screen’ is not defined. Did you mean: ‘Screen’? 21st January 2023; ImportError: cannot import name ‘screen’ from ‘turtle’ 21st January 2023; ModuleNotFoundError: No module named ‘Turtle’ 21st January 2023; Python Quiz Code Sachin Vs Virat 2023 21st January 2023; NameError: name ‘Self’ is not defined.Apr 16, 2022 · 2. TLDR; use this command=app.destroy instead of this command=quito. quit is not defined occurs because the function quito doesn't have access to such variable named quit hence not defined . Assign the command at the quit button to point to app.destroy like so - command=app.destroy that supposed to work because you provide an instance of the ... NameError: name 'Tree' is not defined That's because the class has not been defined yet at this point. The workaround is using so called Forward Reference, i.e. wrapping a class name in a string, i.e. class Tree: def __init__(self, left: 'Tree', right: 'Tree'): self.left = left self.right = rightFeb 11, 2013 · NameError: name 'Tree' is not defined That's because the class has not been defined yet at this point. The workaround is using so called Forward Reference, i.e. wrapping a class name in a string, i.e. class Tree: def __init__(self, left: 'Tree', right: 'Tree'): self.left = left self.right = right on Oct 27, 2017. shadiakiki1986 mentioned this issue on Oct 27, 2017. Safe-to-close issues #129. Closed. maxpumperla closed this as completed on Oct 27, 2017.NameError: global name 'xrange' is not defined in Python 3. 370. Could not find a version that satisfies the requirement tensorflow. 185. NameError: global name ... NameError: name 'Tree' is not defined That's because the class has not been defined yet at this point. The workaround is using so called Forward Reference, i.e. wrapping a class name in a string, i.e. class Tree: def __init__(self, left: 'Tree', right: 'Tree'): self.left = left self.right = right.