Introduction to Python

Course Content

Introduction to Python

Introduction to Python

1. First Acquaintance with Python

The Very First Steps in Python How to Use Comments for Readability Perform Simple Math in Python Handle More Complex Math in Python Bringing Python Fundamentals Together

2. Variables and Types in Python

How to Store Numbers in Python Python Naming Rules for Variables How to Work with Variables in Python Data Types in Python Challenge: Converting Kilometers to Miles Store Text with Strings in Python String Indexing in Python String Slicing in Python Challenge: Retrieving Letters from String String Concatenation in Python

3. Conditional Statements in Python

Boolean Data Type in Python Challenge: Working with Comparison Operators How to Combine Conditions in Python Challenge: Working with Logical Operators Membership Operators and Type Comparisons in Python How to Use if/else Expressions in Python Challenge: Running a Grocery Store Challenge: Creating Odd and Even Logic if/elif/else Expressions Challenge: Running Grocery Store Extended Challenge: Weather Adviser

4. Other Data Types in Python

Python Lists Common List Methods in Python Challenge: Updating List Nested Lists in Python Challenge: Retrieving Information from Nested List Python Tuples Common Tuple Methods in Python Challenge: Updating Tuple Nested Tuples in Python Challenge: Retrieving Information from Nested Tuple Python Dictionaries Challenge: Creating Dictionary Common Dictionary Methods in Python Challenge: Updating Dictionary

5. Loops in Python

Explore the while Loop in Python Challenge: Working with the While Loop Explore the for Loop in Python Challenge: Working with the For Loop Range Function in Python Challenge: Using the Range Function How to Iterate Over Indexes in Python Explore Nested Loops in Python

6. Functions in Python

Built-in Functions in Python Challenge: Converting Heights How to Create Functions in Python Challenge: Writing First Function Use of if/else Statements in Python Functions Challenge: Identifying Positive Values Functions Without Return in Python Challenge: Creating Logging Function Modifying Functions in Python Challenge: Updating Logic of the Function Lambda Functions in Python Challenge: Creating Lambda Function

Use of if/else Statements in Python Functions

Everything discussed previously can be encapsulated within a function for enhanced efficiency and reusability.

For example, consider the earlier if/else statement used to determine whether a number is odd or even. Initially, that code was limited to a specific, predefined number. Evaluating a different number would require either duplicating the entire conditional block or manually altering the number being tested each time.

A more efficient approach involves defining a function that accepts a number as an input parameter. The conditional logic to check for odd or even numbers can then reside within this function, allowing it to be easily called with any number as an argument. This eliminates the need for redundant code or manual edits each time a new number needs to be evaluated.


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# Define a function
def is_odd(n):
  if n % 2 == 0:
    return "even"
  else:
    return "odd"

# Testing function
print('2 is', is_odd(2))
print('3 is', is_odd(3))

Note

A number is considered even if it can be divided by 2 without leaving a remainder. The % operator is used to determine this remainder.

Clearly, the function correctly identifies 2 as even and 3 as odd. This function can be invoked repeatedly with different numbers as needed.

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Section 6. Chapter 5

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