Python for循环可以遍历任何序列的项目，如一个列表或者一个字符串。

语法模式：for iterating_var in sequence:

in 字面意思，从某个集合（列表等）里顺次取值

#遍历数字序列the_count=[1,2,3,4,5]for number in the_count:    print(f"This is count {number}")

输出结果：

This is count 1

This is count 2

This is count 3

This is count 4

This is count 5 

#遍历一维字符串数组fruits=['apples','oranges','dimes','quarters']for fruit in fruits:    print(f"A fruit of type:{fruit}") 输出结果为：

A fruit of type:apples

A fruit of type:oranges

A fruit of type:dimes

A fruit of type:quarters

#遍历字符串list_python='python'for j in list_python:    print(f"{j}")输出结果为：

p

y

t

h

o

n

#通过序列索引迭代 elements=[]#列表为空 for i in range(0,6):#012345     print(f"Adding {i} to the list.")     elements.append(i)#得到elements=[0,1,2,3,4,5]     #len(elements)长为6，range(len(elements))==range(6) for i in range(len(elements)):     print(f"Elemnet was:{i}")

输出结果为：

Adding 0 to the list.

Adding 1 to the list.

Adding 2 to the list.

Adding 3 to the list.

Adding 4 to the list.

Adding 5 to the list.

Elemnet was:0

Elemnet was:1

Elemnet was:2

Elemnet was:3

Elemnet was:4

Elemnet was:5