python set global variable inside function
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Certainly! In Python, when you want to set a global variable inside a function, you need to use the global keyword to indicate that you are referring to a global variable rather than creating a new local variable. Here's a tutorial with a code example:
In Python, variables defined inside a function are considered local to that function by default. However, if you want to modify a global variable from within a function, you need to use the global keyword. This tutorial will guide you through the process of setting global variables inside a function with a simple example.
Global Variable Declaration:
We start by declaring a global variable named global_variable and assigning it an initial value of 10.
Function Definition:
Next, we define a function called modify_global_variable that will modify the global variable.
Use of global Keyword:
Inside the function, we use the global keyword followed by the name of the global variable (global_variable). This tells Python that we are referring to the global variable and not creating a new local variable with the same name.
Modification Inside the Function:
We modify the global variable by adding 5 to its current value.
Printing Inside the Function:
We print the updated value of the global variable inside the function.
Function Invocation:
We call the function to execute its code and modify the global variable.
Printing Outside the Function:
Finally, we print the value of the global variable outside the function to see that it has been modified.
Using the global keyword allows you to modify global variables from within a function in Python. Keep in mind that excessive use of global variables can make code harder to understand and maintain, so use them judiciously.
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