PYTHON · STRINGS

Build meaning
one character at a time.

A string is an ordered sequence of characters. Use indexes to access one character, slices to create substrings, and concatenation to combine strings.

Learning target Trace Python string expressions and explain indexing, slice boundaries, concatenation, and string immutability.

LAB 1 · CHARACTER INDEXING

Select one character by index

Change the string, choose a positive or negative index, and run the Python expression.

String value

0C-16

1O-15

2M-14

3P-13

4U-12

5T-11

6E-10

7R-9

8␠-8

9S-7

10C-6

11I-5

12E-4

13N-3

14C-2

15E-1

Index to read

Valid indexes: -16 through 15

PYTHON EXPRESSIONtext[0]

PYTHON EXPLAINS

Choose an index, then run the expression.

Build meaningone character at a time.

Select one character by index

Build meaning
one character at a time.