python how to declare a global variable
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Title: A Beginner's Guide to Declaring Global Variables in Python
Introduction:
In Python, variables can be categorized as either local or global. Local variables are those declared within a function and are only accessible within that function's scope. On the other hand, global variables are declared outside of any function and can be accessed throughout the entire script. In this tutorial, we'll focus on understanding and declaring global variables in Python.
Declaring Global Variables:
To declare a global variable in Python, you simply need to use the global keyword before the variable name. This tells Python that the variable should be treated as a global variable, even if it is assigned a value within a function.
Syntax:
Example:
Output:
In this example, global_var is declared outside the function, making it a global variable. The my_function function is then able to access and print the value of the global variable. Finally, the global variable is accessed again outside the function, demonstrating its accessibility throughout the script.
Modifying Global Variables:
Global variables can also be modified from within functions. To do this, you need to use the global keyword when assigning a new value to the variable inside the function.
Example:
Output:
In this example, the modify_global_variable function uses the global keyword to indicate that it is modifying the global variable global_var. The value of the global variable is incremented by 5 inside the function, and the modified value is then printed both inside and outside the function.
Conclusion:
Understanding global variables in Python is essential for writing modular and reusable code. By using the global keyword, you can declare and modify global variables, making them accessible across different parts of your Python script.
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