String handling

Overview

len(), indexing and slicing, find() and index(), upper() and lower(), concatenation, split(), strip() and replace(), with worked outputs.

What you need to know

Answer each one before you reveal it.

Questions from this subtopic

Each one with the model answer underneath.

1. 1

   State what is printed by print(len("Hello world")).

   Model answer

   The code prints 11. The space counts as a character.

2. 2

   What character is word[2] when word = "Python"?

   Model answer

   The character is t. Indexing starts at 0, so index 2 is the third character.

3. 3

   State what is printed by word = "computer", then print(word[3:6]).

   Model answer

   The code prints put. The slice starts at index 3 and stops before index 6.

4. 4

   How can the last character of a string s be found using len()?

   Model answer

   The last character is s[len(s) - 1]. The indexes of a string run from 0 to one less than its length.

5. 5

   What is printed by print("banana".find("an"))?

   Model answer

   The code prints 1. The find() method gives the index of the first match, counting from 0.

6. 6

   How do find() and index() differ when the substring is not in the string?

   Model answer

   The find() method returns -1 when the substring is missing. The index() method raises an error instead, which crashes the program.

Other ways to work this

The same content, four other ways.

What is inside Levo

Six ways to work the same material.