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 Challenging 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 Negative Indexing and String Length 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 Pythons 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

Explore the for Loop in Python

When looping through a specific set of values, the for loop is the ideal choice in Python. Unlike some other languages, it does not require a predefined counter variable. Instead, it uses an iterator variable, which does not need to be declared beforehand.

Python for loops work with various sequence types, including lists, tuples, strings, and dictionaries. For example, when iterating over a string:


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# Initial string
word = 'Codefinity'

# Initialize a for loop
for i in word:
  print(i, end = ' ')

Note

The variable i acts as an iterator, taking on the value of each character in the string word during each iteration of the for loop. As the loop runs, i sequentially represents each character in "Codefinity", printing them one by one.

As demonstrated, the loop iterates through each character (or element) in the string. Likewise, when looping through a list, it processes each item in the list one by one.


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# Initial list
values = [1, [2, 3], 4, "code"]

# Initialize a for loop
for el in values:
  print(el, end = ' ')

Note

The for loop doesn't require a predefined counter variable. Any variable name can be used, though programmers often choose common names like i or j. In the second example, el was used as a shorthand for 'element'.

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Section 5. Chapter 3

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