Web Reference: Mar 27, 2026 · By default, one cannot modify a global variable inside a function without declaring it as global. If you try, Python will raise an error because it treats variable as local. When we declare variables inside a function, these variables will have a local scope (within the function). We cannot access them outside the function. These types of variables are called local variables. For example, Output Here, the message variable is local to the greet()function, so it can only be accessed within the function. That's why we get... If you operate with the same variable name inside and outside of a function, Python will treat them as two separate variables, one available in the global scope (outside the function) and one available in the local scope (inside the function):
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