1、遍历整个列表
#for 循环 #
>>> name_list
[‘faker‘, ‘dopa‘, ‘gogoing‘, ‘uzi‘]
>>> for LOL_Player in name_list:
... print(LOL_Player)
faker
dopa
gogoing
uzi
第一步，定义一个列表*name_list*
第二步，通过for语句遍历列表，结果存放到字符串LOL_Player
第三步，打印字符串
for 循环遍历的结果是把整个list中的所有元素读取出来，并且按元素换行。
2，在for循环中执行更多的操作
#在for循环中可以对每一个元素都可以执行任何操作#
>>> name_list
[‘faker‘, ‘dopa‘, ‘gogoing‘, ‘uzi‘]
>>> for LOL_Player in name_list:
... print(LOL_Player.title() + ", They are great players")
...
Faker, They are great players
Dopa, They are great players
Gogoing, They are great players
Uzi, They are great players
3，在for循环结束后执行一些操作
在for循环后面，没有缩进的代码都只执行一次，而且不会重复执行。
name_list=[‘faker‘,‘dade‘,‘gogoing‘,‘clearlove7‘,‘cool‘]
for LOL_Player in name_list:
print(LOL_Player.title() +", They are great players")
print("Thank you, everyone.")
[[email protected] Learn-python]# ./for.py
Faker, They are great players
Dade, They are great players
Gogoing, They are great players
Clearlove7, They are great players
Cool, They are great players
Thank you, everyone.
4，创建数值列表
函数range（）
>>> for value in range(1,5):
... print(value)
...
1
2
3
4
要想创建数字列表，只需要通过list（）把range（）的结果直接转换为列表
例如：
设置一个列表，叫做numbers，其中包含元素[1,2,3,4,5]
>>> numbers=list(range(1,6))
>>> print(numbers)
[1, 2, 3, 4, 5]
使用range（）的时候，还可是设置步长：
>>> numbers_even=list(range(0,11,2))
>>> numbers_even
[0, 2, 4, 6, 8, 10]
将指定整数的平方赋值到变量中
>>> squares=[]
>>> for value in range(1,11):
squares.append(value**2)
>>> squares
[1, 4, 9, 16, 25, 36, 49, 64, 81, 100]
#这里使用了for遍历，让每一个元素都进行**2（在python中**2代表平方），把每个元素的平方追加到列表中
对列表执行简单的统计：
>>> squares
[1, 4, 9, 16, 25, 36, 49, 64, 81, 100]
>>> min(squares)
1
>>> max(squares)
100
>>> sum(squares)
385
列表解析：
通过一行代码，生成上面的squares.py文件
>>> squares=[value**2 for value in range(1,11)]
>>> squares
[1, 4, 9, 16, 25, 36, 49, 64, 81, 100]
使用列表的一部分：
1，切片
>>> lol_players
[‘faker‘, ‘dopa‘, ‘cool‘, ‘dade‘, ‘clearlove7‘, ‘amazingj‘, ‘smlz‘]
>>> print(lol_players[0:3])
[‘faker‘, ‘dopa‘, ‘cool‘]
#切片其实和range（）函数相同，指定索引（0:3）其实就是切了元素0,1,2（记得python的index是从0开始的）#
切片也可以指定步长，不如给一个列表包含数字0-10，进行切片，步长=3
>>> number=list(range(0,11))
>>> number
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
>>> print(number[0:11:3])
[0, 3, 6, 9]
遍历切片：
lol_players
[‘faker‘, ‘dopa‘, ‘cool‘, ‘dade‘, ‘clearlove7‘, ‘amazingj‘, ‘smlz‘]
>>> for head_3_players in lol_players[0:3]:
... print(head_3_players.title())
...
Faker
Dopa
Cool