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Variables and Operations

Welcome to your first adventure in Python programming! Imagine stepping onto a stage, ready to learn the basics. Today, we'll explore variables, naming rules, print statements, and math operations in Python.

Think of variables as instruments where you store your musical notes. In Python, variables hold data values. For example, if you're tracking a musician's performance, you might create a variable called note_count to store the number of notes played in a piece:


python

Naming variables is like choosing a stage name that reflects your musical style. Start with a letter or an underscore, and remember that Python is case-sensitive, so tempo and Tempo are different. Choose descriptive names like total_duration for clarity. Avoid using reserved words like print or if.

Once you've got your variables, it's time to communicate with your audience. The print() function in Python is your amplifier, allowing you to display information. For example:


              12345
            
musician_name = "Alice"
note_count = 120

print("Musician:", musician_name)
print("Notes Played:", note_count)

In Python, variable names must adhere to specific rules to be valid. Below is a code example that illustrates some common mistakes when naming variables:


python

Python is great at handling math operations, similar to calculating a song's average tempo. You can add, subtract, multiply, and divide numbers:


              12345678910
            
beats = 4
bars = 8
total_beats = beats * bars

print("Total Beats:", total_beats)

duration = 240  # in seconds
beats_per_minute = total_beats / (duration / 60)

print("Tempo:", beats_per_minute, "BPM")

Task

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Complete the change_rate function that calculates the relative change in popularity for rock genre tracks over the years. This calculation is useful for understanding trends and shifts in music preferences.

✨ Bonus: See Your Results Visualized! ✨

By finishing the task using the specified steps, you'll unlock a chart that visualizes your results. This chart will provide a clear and engaging representation of the excitement index you've calculated.

Inputs:

previous: An integer representing the previous popularity score.
current: An integer representing the current popularity score.

Steps:

Calculate Relative Change: Use the following formula to determine the percentage change in popularity:
```
python
```

Solution

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Section 1. Chapter 1

solution.py

main.py

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Variables and Operations


python

Once you've got your variables, it's time to communicate with your audience. The print() function in Python is your amplifier, allowing you to display information. For example:


              12345
            
musician_name = "Alice"
note_count = 120

print("Musician:", musician_name)
print("Notes Played:", note_count)

In Python, variable names must adhere to specific rules to be valid. Below is a code example that illustrates some common mistakes when naming variables:


python

Python is great at handling math operations, similar to calculating a song's average tempo. You can add, subtract, multiply, and divide numbers:


              12345678910
            
beats = 4
bars = 8
total_beats = beats * bars

print("Total Beats:", total_beats)

duration = 240  # in seconds
beats_per_minute = total_beats / (duration / 60)

print("Tempo:", beats_per_minute, "BPM")

Task

Swipe to start coding

✨ Bonus: See Your Results Visualized! ✨

By finishing the task using the specified steps, you'll unlock a chart that visualizes your results. This chart will provide a clear and engaging representation of the excitement index you've calculated.

Inputs:

previous: An integer representing the previous popularity score.
current: An integer representing the current popularity score.

Steps:

Calculate Relative Change: Use the following formula to determine the percentage change in popularity:
```
python
```

Solution

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

Everything was clear?

Thanks for your feedback!

Section 1. Chapter 1

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