Appendix A — Python Cheat Sheet

A.1 Common operations

numbers = [1, 2, 3, 4]

print(len(numbers))
print(sum(numbers))
print(min(numbers))
print(max(numbers))
print(numbers[:2])

4
10
1
4
[1, 2]

A.2 Dictionary access

record = {"name": "Dataset A", "year": 2026}

print(record["name"])
print(record.get("source", "unknown"))

Dataset A
unknown

A.3 Useful built-ins

• len()
• range()
• enumerate()
• zip()
• sorted()
• sum()
• min()
• max()
• type()
• isinstance()