Comments
Part of the Fundamentals section of Coddy's Python journey — lesson 3 of 77.
Comments are notes you write inside your code. Python completely ignores them - they exist only to help humans understand the code.
To write a single-line comment, use the # symbol. Everything after # on that line is ignored:
# This is a comment
print("Hello!")A comment can also be written at the end of a line, after the code:
print("Hello!") # This prints Hello!For comments that span several lines, use triple quotes (""") before and after the text:
"""
This is a multi-line comment.
Python ignores all of it.
"""
print("Welcome!")Comments can also temporarily disable a line of code without deleting it:
# print("This line will NOT run")
print("This line will run")
Challenge
BeginnerFix the code so that only Hello, Python! is printed.
- Replace the
?with the symbol that turns a line into a comment - The first line should become a comment so it does NOT run
- Only change the line that starts with
?
Cheat sheet
Comments in Python:
- Notes for humans - Python ignores them
- Can disable code temporarily without deleting it
Single-line comment:
# This is a comment
print("Hello!") # Comment after codeMulti-line comment:
"""
This is a
multi-line comment
"""Disabling code:
# print("This will NOT run")
print("This will run")Try it yourself
# Type your code below
? print("Goodbye!")
print("Hello, Python!")
Test yourselfThis lesson includes a short quiz. Start the lesson to answer it and track your progress.
All lessons in Fundamentals
4Operators Part 2
Logical Operators Part 1Logical Operators Part 2Recap - Simple LogicLogical Operators Part 3Logical Operators Part 4
8Loops
For LoopWhile LoopBreakContinueRecap - FactorialThe Range FunctionNested LoopRecap - Dynamic Input3Operators Part 1
Arithmetic OperatorsModulo OperatorArithmetic ShortcutsRecap - Simple MathComparison Operators9Functions
Declare a FunctionArgumentsReturnRecap - Sigma FunctionRecap - Validation FunctionDefault Values12Iterating Over Sequences
Iterating Over ElementsThe Enumerate FunctionIterating Over Strings Part 1Iterating Over Strings Part 2