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Tkinter. Wenn du dir nicht sicher bist, in welchem der anderen Foren du die Frage stellen sollst, dann bist du hier im Forum für allgemeine Fragen sicher richtig. Foren-Übersicht. Now if you are in an interactive session, it should go like this:I am trying to define a basic function in python but I always get the following error when I run a simple test program;It would help if you showed the code you are using for the simple test program. For that reason, you should keep your declarations at top. Now then, if we run the interactive python session: is not defined. In current versions of python, you can use "in" to check existence in both List and Dicts of defined vars: A good example of this is the __file__ var, which is not defined when the python interpreter is run interactively from a DOS shell, or if a py2exe executable is run.. __file__ is normally found in the variable List returned by "dir()", so you can avoid raising an exception by using: How do you check if a variable is not defined in Python? Foren-Übersicht. Python-Forum.de.

Now if you are in an interactive session, it should go like this:I am trying to define a basic function in python but I always get the following error when I run a simple test program;It would help if you showed the code you are using for the simple test program. Pythonのプログラムをつくっていて、”NameError: name ‘xxx’ is not defined”というエラーの意味や、このエラーが表示されたときのなおし方についてのページです。 If you are using Python 3.x, raw_input has been renamed to input.Quoting the Python 3.0 release notes,. 0. Python GUI-Toolkits. Python独学ならTech-Joho TOP > Python用語辞典 > NameError: name ‘xxx’ is not defined . The Overflow Blog Podcast 226: Programming tutorials can be a real drag Traceback (most recent call last): File "", line 1, in getcwd() NameError: name 'getcwd' is not defined Now, I use the other form of import… >>> from os import * >>> getcwd >>> getcwd() 'C:\\Program Files\\Python38' So either I do something wrong or there is a problem… I did some search and found this problem reported on GitHub… BUT it … All other marks are property of their respective owners.It is generally considered unusual in Python not to know whether a variable has already been defined. Das deutsche Python-Forum. © 2020 ActiveState Software Inc. All rights reserved. 0. TL;DR. input function in Python 2.7, evaluates whatever your enter, as a Python expression. They have to be declared first. os.getcwd() 2. alternative is to do from os import getcwd, then you can do detcwd() 3. the worst (discouraged) approach is to use star import - from os import * In all 3 cases the full module is imported. Wenn du dir nicht sicher bist, in welchem der anderen Foren du die Frage stellen sollst, dann bist du hier im Forum für allgemeine Fragen sicher richtig. You can change which python you're using with your IDE, if you've already downloaded python 3.x it shouldn't be too hard to switch. For that reason, you should keep your declarations at top.I hope this explains how the declaration works.if working with IDLE installed version of PythonThanks for contributing an answer to Stack Overflow!Now then, if we run the interactive python session:

Attempting to access a variable that hasn't previously been defined will raise an exception.You want to take different courses of action based on whether a variable is defined or not.Many situations which might be thought would give rise to undefined variables, such as processing configuration files or web forms, can be better handled by employing a dictionary and testing for the presence of a key with the has_key() method. Fragen zu Tkinter. Foren-Übersicht. 1. when you do import os you need to fully qualify which function you want to use e.g. $ python program.py Traceback (most recent call last): File "program.py", line 3, in pyth_test(1,2) NameError: name 'pyth_test' is not defined As noted, python cannot find the module for the reasons outlined above. If you simply want to read strings, then use raw_input function in Python 2.7, which will not evaluate the read strings.. Anyone know how to deal with this?Python doesn't have a specific function to test whether a variable is defined, since all variables are expected to have been defined before use - even if initially just assigned the None object. Is raised when you tried to use a variable, method or function that is not initialized (at least not before). python documentation: NameError: name '???' So this will work:To subscribe to this RSS feed, copy and paste this URL into your RSS reader.You should see the output you desire. (I apologize for the basic question, I've never programmed before and am trying to learn Python as a hobby)In python functions aren't accessible magically from everywhere (like they are in say, php). Jun 23, 2020 in Python by Sumana . Python-Forum.de. For that reason, you should keep your declarations at top. Now then, if we run the interactive python session: In Python terms, variables are not variables as conceptualised in other languages like C/C++/Java, they are simply names. Seit 2002 Diskussionen rund um die Programmiersprache Python. $ python program.py Traceback (most recent call last): File "program.py", line 3, in pyth_test(1,2) NameError: name 'pyth_test' is not defined As noted, python cannot find the module for the reasons outlined above. Seit 2002 Diskussionen rund um die Programmiersprache Python. Now to explain what went wrong, let's modify our program this way:As noted, python cannot find the module for the reasons outlined above.