I have a python script and I am receiving the following error:
Traceback (most recent call last):
File "C:\Users\Tim\Desktop\pop-erp\test.py", line 1, in <module>
s = Something()
NameError: name 'Something' is not defined
Here is the code that causes the problem:
s = Something()
s.out()
class Something:
def out():
print("it works")
This is being run with Python 3.3.0 under Windows 7 x86-64.
Why can't the Something
class be found?
This question is related to
python
python-3.x
nameerror
You must define the class before creating an instance of the class. Move the invocation of Something
to the end of the script.
You can try to put the cart before the horse and invoke procedures before they are defined, but it will be an ugly hack and you will have to roll your own as defined here:
Note that sometimes you will want to use the class type name inside its own definition, for example when using Python Typing module, e.g.
class Tree:
def __init__(self, left: Tree, right: Tree):
self.left = left
self.right = right
This will also result in
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
Source: Stackoverflow.com