Python For Loops: Working with Composite Data Types

Python’s for loop uses the for ... in ... syntax, which differs from the traditional C‑style loop found in many other languages.

The general form is for element in iterable, where the iterable can be a string, list, tuple, set, or any other object that supports iteration.

The built‑in range function generates a sequence of integers. Its first argument is the start value (inclusive) and the second argument is the end value (exclusive).

Examples:

# Output all numbers from 1 to 10
for i in range(1, 11):
    print(i)

# Print each element of a list
for i in [12, 34, 5, 6, 86, 42]:
    print(i)

# Iterate over a string
for i in "hello":
    print(i)

# Iterate over a Chinese string
for i in "欢迎光临":
    print(i)

The resulting output is:

1
2
3
4
5
6
7
8
9
10
12
34
5
6
86
42
h
e
l
l
o
欢
迎
光
临