Strings

Strings are immutable sequences of characters. Index with s[i], slice with s[a:b].

Slice syntax

s[start:stop:step] — any of the three can be omitted. s[::-1] reverses.

Common methods

• .upper(), .lower(), .title()
• .strip() — trim whitespace
• .replace(old, new)
• .split(sep) and sep.join(list)
• .startswith(), .endswith(), .find()

f-string formatting

f"{value:.2f}" — 2 decimal places. f"{n:>5}" — right-align in 5 chars.

Try it

1. Take " hello " and produce "Hello".
2. Reverse just the first word of "python rocks".