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While Loops

Today, we'll explore the while loop in Python, a powerful tool that allows you to repeat actions until a certain condition is met. This concept is essential in data analytics, where you often need to process data iteratively.

In Python, a while loop continues to execute a block of code as long as a specified condition is true. Think of it like a musician practicing a section of a song repeatedly until they master it. The loop will keep running until the condition becomes false.

Basic Structure:


python

Example:

Imagine you're tracking the practice time of a musician. You want to keep practicing until a certain number of hours is reached:


              12345678
            
practice_hours = 0
goal_hours = 5

while practice_hours < goal_hours:
    print("Keep practicing!")
    practice_hours += 1

print("Practice goal reached!")

In this example, the loop will print "Keep practicing!" and increment practice_hours by 1 until it reaches goal_hours. Once the condition practice_hours < goal_hours is no longer true, the loop stops, and "Practice goal reached!" is printed.

Let's say you have a list of song durations and you want to calculate the total duration until a certain limit is reached:


              12345678910
            
song_durations = [3, 4, 5, 2, 6]  # in minutes
total_duration = 0
limit = 10

index = 0
while index < len(song_durations) and total_duration + song_durations[index] <= limit:
    total_duration += song_durations[index]
    index += 1

print("Total Duration:", total_duration, "minutes")

In this example, the loop iterates through the song_durations list, adding each duration to total_duration until the limit is reached.

Task

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Complete the count_popular_tracks function that counts the number of tracks with a popularity score greater than a specified threshold. This function will utilize a while loop to iterate over the tracks dataset.

Inputs:

tracks: A list of dictionaries, where each dictionary represents a track and contains a key 'track_popularity' with an integer value.
threshold: An integer representing the popularity score threshold.

Steps:

Iterate Over Tracks:
- Use a while loop to iterate over the tracks list until the end of the list is reached.
- Inside the loop, check if the popularity score of the current track (accessed via tracks[index]['track_popularity']) is greater than the threshold.
Update Count: If the condition is met, increment the count by 1.
Increment Index: Increment the index by 1 to move to the next track.

Solution

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Section 2. Chapter 2

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While Loops

Basic Structure:


python

Example:

Imagine you're tracking the practice time of a musician. You want to keep practicing until a certain number of hours is reached:


              12345678
            
practice_hours = 0
goal_hours = 5

while practice_hours < goal_hours:
    print("Keep practicing!")
    practice_hours += 1

print("Practice goal reached!")

Let's say you have a list of song durations and you want to calculate the total duration until a certain limit is reached:


              12345678910
            
song_durations = [3, 4, 5, 2, 6]  # in minutes
total_duration = 0
limit = 10

index = 0
while index < len(song_durations) and total_duration + song_durations[index] <= limit:
    total_duration += song_durations[index]
    index += 1

print("Total Duration:", total_duration, "minutes")

In this example, the loop iterates through the song_durations list, adding each duration to total_duration until the limit is reached.

Task

Swipe to start coding

Inputs:

tracks: A list of dictionaries, where each dictionary represents a track and contains a key 'track_popularity' with an integer value.
threshold: An integer representing the popularity score threshold.

Steps:

Iterate Over Tracks:
- Use a while loop to iterate over the tracks list until the end of the list is reached.
- Inside the loop, check if the popularity score of the current track (accessed via tracks[index]['track_popularity']) is greater than the threshold.
Update Count: If the condition is met, increment the count by 1.
Increment Index: Increment the index by 1 to move to the next track.

Solution

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Everything was clear?

Thanks for your feedback!

Section 2. Chapter 2

Switch to desktop for real-world practiceContinue from where you are using one of the options below