学ぶ Understanding Variable Scope | Variable and Assignment Mistakes

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count = 10

def increment():
    count = count + 1  # Tries to increment the global 'count'
    print("Inside function:", count)

increment()
print("Outside function:", count)

Variable scope in Python determines where a variable can be accessed or modified. In the code above, there is a variable count defined outside the function, making it a global variable. Inside the increment function, the code tries to increment count without declaring it as global. Python treats any assignment to a variable name inside a function as creating a new local variable unless you explicitly declare it as global using the global keyword. Because of this, count = count + 1 inside the function tries to use a local count that has not been initialized, resulting in an UnboundLocalError. To modify the global variable inside a function, you must declare it as global within the function.