May 1, 2017 · You need to separate your class from the main code as below because interpreter thinks that the line 4 and what is after that belong to your class: class Agent: def hello(self, first_name): return "Bien le bonjour" + first_name + "!"

May 23, 2012 · Despite importing the .py file containing my class, Python is insistent that the class doesn't actually exist. Class definition in testmodule.py: class Greeter: def __init__(self, arg1=None): self.text = arg1 def say_hi(self): return self.text

Feb 23, 2025 · NameError is a common error in Python. It happens when a name is not defined. This can occur in functions and classes. By understanding its causes, you can avoid it. Always define names before using them. Check your code for typos. For more details, visit Python NameError: Name is Not Defined.

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.

Sep 17, 2019 · It looks like the error line is in a function called main. If the class definition is not in the same file before main is called, that could cause the error. Thanks, that was the issue (solved with an import). it seems that it takes a parameter for me.

Dec 4, 2021 · If I make a small change and put the class name in quotes: def simple_factory(cls, s:str, i:int) -> 'Foo': I don't get the error and the factory method behaves exactly as I expect it to.

21 hours ago · NameError: name 'a' is not defined. In Python, you can catch all such errors and exceptions by wrapping the code in a try-except block. try: print(a) except NameError: ... What if you want to check if a specific class attribute is defined or not? In this case, you can use hasattr() function. The hasattr() function is used to check if an object ...

I'm on python 3.8.10 in case it's a version-specific bug or something. Why is this? The class doesn't exist in the namespace until after it's been defined, which means you can't use the class's name in contexts that evaluate at definition time, like type hints.

Feb 11, 2013 · The solution to this problem is to invoke your classes and functions after you define them. Python does not have any way to forward declare classes or methods so the only option is to put the invocations of functions at the end of the program rather than the beginning.

May 17, 2019 · Some issues in your code . You are missing a self argument in def avg_start_speed(): assuming you want to use it as a class method. (I see you using self inside the function definition as well). So it will be def avg_start_speed(self): You also define spreadsheet outside the class.