TypeError: 'NoneType' object is not iterable in Python

The TypeError: 'NoneType' object is not iterable error message is raised when you are trying to iterate over an object that has a value of None, which is not iterable. This means that you are trying to use a for loop or some other kind of iteration on an object that has a value of None, which is not allowed in Python.

Here's an example of code that will raise this error:

items = None

try:
    for item in items:
        print(item)
except Exception as e:
    print(e)

This code will raise the TypeError: 'NoneType' object is not iterable error because the items variable has a value of None, which is not iterable.

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To fix this error, you need to make sure that the object you are trying to iterate over is a valid iterable object, such as a list, a tuple, or a string. You can also use an if statement to check if the object is None before attempting to iterate over it.

For example:

items = None

if items is not None:
    for item in items:
        print(item)

print("done without error")

This code will not raise the TypeError error because the if statement will prevent the for loop from being executed if items is None.