May 7, 2015 · Python’s boolean constants are capitalized: True and False with upper case T and F respectively. The lower-case variants are just valid free names for variables, so you could use them for whatever you want, e.g. true = False (not recommended ;P).

Feb 23, 2025 · Learn how to fix Python NameError: Name 'True' Not Defined. Understand causes, solutions, and examples for beginners.

Dec 21, 2019 · If use true it means variable true, if use True it is boolean value true in python. So correct way is: return ({"userid" : row.userid ,"data": {"url": row.url},"bool":True})

Nov 17, 2014 · Your specific issue of NameError: name 'guess' is not defined is because guess is defined in your main function, but the while loop that it is failing on is outside of that function. Your indention is entirely wrong for this application.

Apr 15, 2022 · 本文介绍了在Python中遇到NameError，提示'true'未定义的问题。问题源于将布尔值误写为小写的'true'，而非大写的'True'。在Python中，布尔类型是大小写敏感的，正确写法应为True和False。解决方法是将代码中的true更正为True，并展示了使用not关键字进行逻辑判断的示 …

May 11, 2023 · How to fix “nameerror name true is not defined”? To fix the nameerror: name ‘true’ is not defined error message in Python, ensure that “True” is capitalized. Solution 1: Use correct boolean value

Feb 23, 2025 · Fixing a NameError involves identifying the root cause and correcting it. Here are some steps to help you resolve it. 1. Check for Typos. Double-check your code for any misspelled variable or function names. Correcting typos often resolves the issue. 2. Define Variables and Functions Before Use.

Jul 2, 2020 · You execute your Python program and you see an error, "NameError: name ... is not defined". What does it mean? Let's see how you can quickly fix it.

Feb 23, 2025 · Learn about Python NameError: Name is Not Defined, its causes, and how to fix it. Suitable for beginners with examples and solutions.

Feb 19, 2024 · Learn what is the NameError: name is not defined in Python error, its root causes and how to fix it using different techniques.