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Manuals / Python / Chapter 3

A · Setup · beginner · Week 1–2 · Chapter 3 of 13

Syntax, types & control flow

Indentation, variables, strings, f-strings, if/for, lists, dicts. Enough to read test code and write helpers.

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Variables and f-strings

Dynamic typing — types exist at runtime. f-strings are the readable default for formatting.

Variables and f-stringsDrag stickies · tap for tips
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Example

username = "standard_user"
password = "secret_sauce"
print(f"Attempting login for {username}")

Do this now

Script that stores username/password and prints formatted login attempt.

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Chapter learning outcomes
  • Indentation rules
  • f-strings
  • if/elif/else
  • for loops
  • lists and dicts

Clear these before you leave

Side quest

Password validator

Function is_valid_password(s) → bool with length and empty checks.