local variable vs global variable in python

Veröffentlicht am: 20 Januar 2024
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In Python, variables can be categorized as either local or global, based on their scope and accessibility within a program. Understanding the difference between local and global variables is crucial for writing efficient and maintainable code. In this tutorial, we'll explore the concepts of local and global variables in Python with code examples.
A local variable is a variable declared inside a function or a block of code. It is accessible only within that specific function or block, and its scope is limited to the boundaries of that function or block.
In this example, local_variable is defined within the example_function(). Attempting to access it outside the function will result in an error.
A global variable is a variable declared outside any function or block. It is accessible throughout the entire program, making it available for use in any part of the code.
Here, global_variable is declared outside the function, making it accessible both inside and outside the example_function().
It is possible to have variables with the same name at both the local and global levels. When a local variable shares its name with a global variable, the local variable takes precedence within its scope.
In this case, the example_function() has a local variable named global_variable. Inside the function, the local variable is used, and outside the function, the global variable is accessed.
Understanding the distinction between local and global variables is essential for writing clear, maintainable, and error-free Python code. Proper use of local and global variables enhances code readability and helps prevent unintentional side effects in your programs.
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