git blame for line-by-line history - Mini Project: Build & Apply

git blame for line-by-line history

📖 Scenario: You are working on a small project with a file called app.py. You want to find out who last changed each line in this file to understand the history better.

🎯 Goal: Learn how to use git blame to see line-by-line history of changes in a file.

📋 What You'll Learn

Have a git repository initialized

Have a file named app.py with at least 3 lines of code

Use git blame to see who last changed each line

💡 Why This Matters

🌍 Real World

Developers often need to find out who last changed a specific line of code to understand why a change was made or to ask questions.

💼 Career

Knowing how to use <code>git blame</code> is essential for debugging, code reviews, and collaborating in software development teams.

1

Create a file app.py with 3 lines of code

Create a file called app.py with these exact lines:
print('Hello World')
print('Welcome to git blame')
print('This is line 3')

Git

# Create the file app.py with the 3 lines exactly as instructed
# Your code here

Need a hint?

Use a text editor or command line to create app.py with the exact lines.

2

Add and commit the file to git

Add the file app.py to git staging area using git add app.py and commit it with the message Initial commit with app.py using git commit -m "Initial commit with app.py"

Git

print('Hello World')
print('Welcome to git blame')
print('This is line 3')
# Add app.py to git and commit with message "Initial commit with app.py"
# Your code here

Need a hint?

Use git add to stage and git commit -m to commit with the exact message.

3

Modify the second line in app.py

Change the second line in app.py to print('Welcome to the git blame tutorial') exactly, then add and commit the change with message Update welcome message

Git

print('Hello World')
print('Welcome to git blame')
print('This is line 3')

# Modify the second line as instructed
# Add and commit the change with message "Update welcome message"
# Your code here

Need a hint?

Edit the file to change the second line exactly, then stage and commit with the exact message.

4

Use git blame to see line-by-line history of app.py

Run the command git blame app.py to display who last changed each line in app.py.

Git

print('Hello World')
print('Welcome to the git blame tutorial')
print('This is line 3')

# Run git blame on app.py below
# Your code here

Need a hint?

Simply run git blame app.py to see the line-by-line history.