python change value of global variable in function
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title: changing the value of a global variable in python functions: a tutorial
introduction:
global variables in python are variables that are declared outside any function or block of code and can be accessed from anywhere within the program. sometimes, there might be a need to modify the value of a global variable from within a function. in this tutorial, we will explore how to change the value of a global variable inside a python function.
code example:
let's start with a simple example:
explanation:
declare a global variable:
here, we declare a global variable named global_variable and initialize it with the value 10.
define a function to change the global variable:
the function change_global_variable takes a parameter new_value and modifies the global variable global_variable using the global keyword.
access and display initial value:
this prints the initial value of the global variable before calling the function.
call the function to change the global variable's value:
the function is called with the argument 20, which sets the global variable to this new value.
display updated value:
finally, we print the updated value of the global variable after calling the function.
conclusion:
by using the global keyword inside a function, you can modify the value of a global variable. however, it's important to use global variables judiciously, as excessive use can make code less modular and harder to understand. always consider other alternatives, such as passing variables as parameters to functions, before resorting to global variables.
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