for循环

for循环

game_list=['吃','吃饭','吃饭饭','吃饭饭饭','吃烦烦烦放','23','33','77',]
#           0     1       2       3           4        5    6     7
index=0
while index<8:
    print(game_list[index])
    index+=1

吃
吃饭
吃饭饭
吃饭饭饭
吃烦烦烦放
23
33
77

for i in 列表or字典：
i即是列表的每个元素

for i in game_list:
    print(i)

吃
吃饭
吃饭饭
吃饭饭饭
吃烦烦烦放
23
33
77

for+ break

game_list=['吃','吃饭','吃饭饭','吃饭饭饭','吃烦烦烦放','23','33','77',]
#           0     1       2       3           4        5    6     7
for i in game_list:
    if i=='吃饭饭':
        break
    print(i)

吃
吃饭

for+continue

game_list=['吃','吃饭','吃饭饭','吃饭饭饭','吃烦烦烦放','23','33','77',]
#           0     1       2       3           4        5    6     7
for i in game_list:
    if i=='吃饭饭':
        continue
    print(i)

吃
吃饭
吃饭饭饭
吃烦烦烦放
23
33
77

for+else

• for循环没有被break的时候，执行else里的代码

game_list = ['xiaoxiaokan','kaixinxiaoxiaole','tiaoyitiao','chaojimali','hundouluo','zhizhuzhipai','saolei','renzheshengui']
for i in game_list:
    if i == 'chaojimali':
        continue
    print(i)
else:
    print('我没有被break掉')

xiaoxiaokan
kaixinxiaoxiaole
tiaoyitiao
hundouluo
zhizhuzhipai
saolei
renzheshengui
我没有被break掉

game_list = ['xiaoxiaokan','kaixinxiaoxiaole','tiaoyitiao','chaojimali','hundouluo','zhizhuzhipai','saolei','renzheshengui']
for i in game_list:
    if i == 'chaojimali':
        break
    print(i)
else:
    print('我没有被break掉')

xiaoxiaokan
kaixinxiaoxiaole
tiaoyitiao

list(range(3))

[0, 1, 2]

for循环的嵌套

for i in range(3):
    for j in range(2):
        print(i,j)
        

0 0
0 1
1 0
1 1
2 0
2 1

for循环实现loading

import time

print('Loading', end='')
for i in range(6):
    print(".", end='')
    time.sleep(0.2)

Loading......

print(1)
print(2)
print(3)

1
2
3

print(1,end='')
print(2,end='')
print(3,end='')

123