Writing Python functions

by vsasikalabe Updated: Feb 22, 2023

Guide Kit

A function is a block of code. It always runs when it is called. In a function, you can pass data as a parameter. Data returned because of a function. Arguments are passed into functions. Here, arguments are information. Inside the parentheses, arguments are denoted after the function name. Just separate them with a comma. We can add as many arguments as possible.

To define a function in Python, the following four steps are used:

To declare the function use the keyword def and follow up with the function name.
To execute the functions add statements.
They should be within the function's parentheses after adding the parameters to the function.
The end line always is with a colon.

Call the function within a policy after declaring your functions. The User-defined functions are used to encapsulate and reuse functionality in your policy. The Function keyword pursued by the function's name and a comma-separated list with the parameters is the syntax for a function declaration.

We display the details using the python functions, where the user name, contact number, username, and password are displayed. Here some conditions are applied to that details. The name and user name must be letters. Otherwise, it shows an alert message; the contact number and password must be numeric. Finally, the entered details are shown using a print statement.

Here is an example of how to write Python Functions:

Fig : Preview of the output that you will get on running this code from your IDE.

Code

Writing Python functions

PythonLines of Code : 23License : Strong Copyleft (CC BY-SA 4.0)

Dependent Libraries :

def bank_account(name, number, username, password):
    if not name.isalpha():
        print('Your name must only contain letters!')
        return 'Invalid'
    try:
        number = int(number)
        password = int(password)
    except ValueError:
        print('Your number and password must be numeric!')
        return 'Invalid'
    return name, number, username, password


new_name = input("(alphas) Please Enter Your Name: ")
new_number = input("(ints) What's your number please: ")
new_username = input("Enter your UserName: ")
new_password = input("(ints) Enter your Password: ")

print("Your details:", bank_account(new_name,
                                    new_number,
                                    new_username,
                                    new_password))

Instructions

Follow the steps carefully to get the output easily.

Copy the snippet using the 'copy' and paste it in your IDE.
Add required dependencies and import them in Python file.
Run the file to generate the output.

I hope you found this useful.

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Environment Tested

I tested this solution in the following versions. Be mindful of changes when working with other versions.

The solution is created in PyCharm 2021.3.
The solution is tested on Python 3.9.7.

Using this solution, we are able to write Python functions with simple steps. This process also facilities an easy way to use, hassle-free method to create a hands-on working version of code which would help us to Write Python functions.

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