How do I call a Variable from Another Function in Python?

A variable is a way of storing values in the Python programming language so they can be used later in the program. These variables frequently find use within functions, necessitating the need to access a variable from another function. We shall examine Python's methods for calling a variable from another function in this article.

In Python, calling a variable from another function can be done in several ways

• Global Variables

• Return Statement

• Passing as Arguments

Let's take a closer look at each of these techniques

Using Global Variables

A global variable is a variable that can be accessed from any place in the program. Regardless of where the variable was initially declared, this property of global variables enables the retrieval of its values from any function inside the program.

Example

def first_function():
    global message
    message = "I am a global variable"

def second_function():
    print(message)

first_function()
second_function()

The output will be

I am a global variable

Use caution while utilizing global variables because they can be changed from any function.

Using Return Statement

An alternative method of calling a variable from another function is through the use of the return statement. A return statement allows for the passing of a value from within a function to an external location. This enables the storage of the returned value from a function into a designated variable.

Example

def first_function():
    return "I am a returned variable"

def second_function():
    result = first_function()
    print(result)

second_function()

The output will be

I am a returned variable

Using Function Arguments

The most clean and recommended approach is to pass variables as arguments to functions. This provides better control and avoids the pitfalls of global variables.

Example

def first_function():
    data = "I am passed as argument"
    second_function(data)

def second_function(received_data):
    print(received_data)

first_function()

The output will be

I am passed as argument

Comparison of Methods

Conclusion

When calling a variable from another function in Python, using function arguments and return statements is generally preferred over global variables. These methods provide better control, maintainability, and reduce the risk of unexpected side effects in your code.