Why Does Redefining the `str` Function Cause a TypeError in Python?

Overwriting Built-in Functions

Why does the code snippet below result in a TypeError the second time it's executed?

def example(parameter):
    global str
    str = str(parameter)
    print(str)

example(1)
example(2)

When executing the first time, the program runs without issues. However, upon calling it a second time, an error is thrown:

TypeError: 'str' object is not callable

Analysis

This error occurs because the code redefines the built-in str function within the example function. By using the global keyword and assigning a new value to str, the code overwrites the original implementation of the string type.

Resolution

To fix this issue, avoid redefining built-in functions like str. Instead, use a different name for the local variable and remove the global statement:

def example(parameter):
    local_string = str(parameter)
    print(local_string)

The above is the detailed content of Why Does Redefining the `str` Function Cause a TypeError in Python?. For more information, please follow other related articles on the PHP Chinese website!