INTRODUCTION TO PYTHON
Campus Resource Library | Open study notes

Variables bind names to values: count = 3
Lists store ordered items: scores = [72, 85, 91]
Loop over items: for score in scores: print(score)
Functions organize behavior:

def mean(values):
    if not values:
        raise ValueError("values must not be empty")
    return sum(values) / len(values)

Use with open(path, encoding="utf-8") as f: to read text files.
Use descriptive names and small functions.
Test normal cases, boundary cases, and invalid inputs.
Never store passwords or private keys in shared source files.