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Defining and Calling Functions in Python

Introduction
Setting Up Your Python Environment
Installing Python and PyCharm IDE Creating and Running Your First Python Program
Python Data Types
Numeric Types String Types Boolean Types None Type
Operators and Expressions
Arithmetic Operators Comparison Operators Logical Operators Bitwise Operators Assignment Operators Operator Precedence
Control Flow Statements
Conditional Statements Loops Break and Continue Statements Exception Handling
Functions and Modules
Defining and Calling Functions Function Arguments and Return Values Lambda Functions Modules and Packages
Python Data Structures
Lists Tuples Dictionaries Sets Arrays
ObjectOriented Programming in Python
Classes and Objects Attributes and Methods Inheritance and Polymorphism Abstract Classes and Interfaces
File Handling
Opening and Closing Files Reading and Writing Text Files Reading and Writing Binary Files CSV Files
Regular Expressions
Basic Regular Expressions and Metacharacters Anchors and Quantifiers Grouping and Capturing Lookarounds
Datetime and Timezones
Date and Time Objects Date and Time Formatting Timezone and Daylight Saving Time Handling
Debugging and Testing
Debugging Techniques Debugging Tools in PyCharm Unit Testing with PyTest
Web Scraping with Python
Requesting Data with urllib Parsing HTML with Beautiful Soup Extracting and Storing Data
Database Handling with Python
Connecting to Databases Performing CRUD Operations Database Access with ORM (ObjectRelational Mapping)
Introduction to Data Science with Python
NumPy Pandas Matplotlib ScikitLearn
GUI Programming with Python
Creating GUI Applications GUI Toolkits (Tkinter, PyQt, wxWidgets)
Network Programming with Python
Socket Programming Creating and Running a Simple Web Server Connecting to APIs
Best Practices and Tips
Python Coding Standards Code Organization Writing Efficient Code Tips and Tricks for Python Development
Conclusion and Next Steps.

Defining and Calling Functions

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In Python, a function is a block of code that performs a specific task and can be called multiple times within a program. A function can take inputs as arguments and can also return values as output.

To define a function, the "def" keyword is used, followed by the function name, and then the parameters (if any) are enclosed in parentheses. The code inside the function is indented and contains the logic of the function.

Here's an example:

 
                    
def add_numbers(x, y):
    result = x + y
    return result

In this example, the function "add_numbers" takes two arguments, x and y, and returns the result of adding them together.

Once a function is defined, it can be called elsewhere in the program using its name and passing in the appropriate arguments.

Here's an example of how to call the "add_numbers" function:

 
                    
sum = add_numbers(4, 6)
print(sum)

This will output "10" because the "add_numbers" function was called with arguments 4 and 6, and returned the result of 10. The variable "sum" is then assigned the value of 10, and this value is printed to the console using the "print" function.

March 25, 2023

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