Project: reusable study summary

Create study_summary.py. Reuse what you know about lists and dictionaries, but place calculations and formatting in named functions.

Build the summary

def total_minutes(sessions: list[dict[str, int]]) -> int:
    """Add the minutes from all study sessions."""
    total = 0
    for session in sessions:
        total += session["minutes"]
    return total

def format_duration(minutes: int) -> str:
    """Format minutes as hours and remaining minutes."""
    return f"{minutes // 60} h {minutes % 60} min"

sessions = [{"minutes": 25}, {"minutes": 40}, {"minutes": 30}]
print(f"Study time: {format_duration(total_minutes(sessions))}")

Study time: 1 h 35 min

Why this works

total_minutes() handles the data calculation and returns one integer. format_duration() handles presentation and returns a string. The final print combines them. Separating calculation from display makes each function easier to inspect and reuse with a different output format.

Check and extend

Run the program, then add a 25-minute session. Predict 2 h 0 min before rerunning. Explain which function performs arithmetic and which formats the message.

Try another case

If the sessions total 125 minutes, what does format_duration() return?