Introduction to Python -

Lesson 5 of 16

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Lesson 5 of 16

Code Example

# List of integers
nums1 = [1, 2, 3]
print(nums1)

nums2 = [5, 10, 15]
print(nums2)

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A list is like a backpack where you can store a whole collection of items together.
To make a list, we put all our items inside square brackets [ ].
We use commas to separate the items so Python knows where one ends and the next begins.
Your list can hold anything! It can be a group of numbers, decimals, or words.
When you give your list a name, like pets or colors, you can use it later in your code.
Just use print() with the list's name to see everything you stored inside it on the screen.

Code Example

# List of decimals
prices = [1.5, 2.0, 3.25]
print(prices)

heights = [4.2, 5.1, 6.0]
print(heights)

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Lists are like containers that hold many values together.
A list can store decimal numbers like 1.5 or 3.25.
Each list here has 3 items inside it.

Code Example

# List of words
pets = ["Cat", "Dog", "Bird"]
print(pets)

colors = ["Red", "Blue", "Green"]
print(colors)

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Lists are like containers that hold words together.
A list can store individual words like "Cat" or "Red".
Each list here has 3 words inside it.

Code Example

# List of short sentences
quotes = ["Be kind", "Work hard", "Stay happy"]
print(quotes)

# List of short sentences
facts = ["The sky is blue", "Grass is green"]
print(facts)

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Lists are like containers that can hold short sentences.
A list can store phrases like "Be kind" or "The sky is blue".
The first list has 3 sentences, and the second list has 2 sentences.

Code Example

# List Indexing - Picking the first sentence
my_pets = ["I have a cat", "I have a dog", "I have a bird"]
print(my_pets[0])

# List Indexing - Picking the last sentence
my_goals = ["Learn to code", "Play soccer", "Read a book"]
print(my_goals[2])

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When you have a list of sentences, Python gives each one a "hidden number" to help you find it.
The first sentence in your list is always number 0, the second is number 1, and the third is number 2.
To grab just one sentence, put its number inside square brackets [ ] right after the list name.

Code Example

# List of different data types
mix1 = [5, "Hello", 2.5]
print(mix1)

mix2 = ["Cat", 10, True]
print(mix2)

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A list can hold different kinds of things, like numbers and words.
We use square brackets [ ] to get one item from a list.
Counting starts at 0, so [0] means the first item.
print() shows the list or the item on the screen.

Code Example

# List indexing (getting one item from the list)
items1 = [7, "Apple", 3.5]
print(items1[0])

items2 = ["Dog", 4, False]
print(items2[0])

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Lists can hold different types of things like numbers, words, and even True/False.
Each item in a list has a position called an index.
The first item in a list always has an index of 0.
You can use the index inside [ ] to get one item from the list.

Code Example

# Zip names with ages
names = ["Sam", "Alex"]
ages = [10, 12]

result = list(zip(names, ages))

print(result)

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The zip() helper is like a zipper on a jacket that pulls two different lists together into pairs.
It takes the first item from the first list and matches it perfectly with the first item from the second list.
In your loop, you use two names like name, age to hold the two pieces of information at the same time.
This is the best way to keep related data together, like matching a person's name with their favorite color or their age.

Code Example

# Zip colors with objects
colors = ["Red", "Blue"]
things = ["Car", "Ball"]

result = list(zip(colors, things))

print(result)

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zip() is used to join two lists together.
It takes one item from each list and pairs them up.
The result is groups (pairs), not single items.
Each group has one item from each list, like ("Red", "Car").

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What is a list in Python like?

A single numberA backpack holding many itemsA computer screenA keyboard

Introduction to Python -

Introduction to Python -

What is a list in Python like?

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What is a list in Python like?

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