Week 11 — Strings in Depth & Text Processing

Welcome to your Week 11 Start Here page.

Why this matters

A public-health student cleaning a column of survey replies and a business major pulling the price out of each line of a sales log both need a program that tidies text and takes it apart without losing a character.

In plain language

Most of the data people care about arrives as text: a line in a log, a typed reply, a message in a group chat. This week you learn the tools Python gives you for working with text. A string method (a small tool that belongs to a piece of text and is called with a dot) can turn text into capitals, trim its ends, or cut it into pieces. Every one of these tools hands you a new piece of text and leaves the old one exactly as it was. As always, you predict what each program prints and then run it to check.

• Already covered: strings and slices from Week 3, and lists from Week 9.
• This week: string methods, split and join, find, replace, and count.
• How they connect: split hands you a list; every method hands back new text.
• Where we're going next: Week 12, files and exceptions.

Focus

How do you take a line of text apart, tidy it, and put it back together?

By the end of this module, you should be able to:

• [ ] predict what a string method hands back
• [ ] split a line, convert a piece, and rejoin it
• [ ] read find as a position or minus 1, not True or False

To-do

Plan your week

1. Read Chapter 11 (about 45 minutes), then the lecture and slides.
2. Work the lecture tutorial (60–90 minutes) and the practice set (about 20 minutes).
3. Do the Coding Lab (about 90 minutes), the discussion, and the assignment.
4. Take the quiz.

This week's checkpoint: predict what s = "Hello" then s.upper() then print(s) prints, run it, and explain why.

You've got this

Predict, then run, and ask your instructor if a step snags.

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