# for 循环

while循环是可控，但是控制不好是不是就是一个死循环。

```python

wenyi_info_list = ['AA','BB','CC','DD','EE']

print(wenyi_info_list[0])

print(wenyi_info_list[1])

print(wenyi_info_list[2])

```

```

AA

BB

CC

```

 

```python

wengyi_info_list = ['AA','BB','CC']

len(wengyi_info_list)

```

 

```

3

```

 

```python

wenyi_info_list = ['wenyi', 150, 260, ['piao', '666', 'fish'],'zhangdechou',1,2,3,4,5,6,67,]

count = 0

while count < len(wenyi_info_list):

print(wenyi_info_list[count])

count += 1

```

```

wenyi

150

260

['piao', '666', 'fish']

zhangdechou

1

2

3

4

5

6

67

```

 

```python

wenyi_info_list = ['wenyi', 150, 260, ['piao', '666', 'fish'],'zhangdechou',1,2,3,4,5,6,67,]

for i in wenyi_info_list:

print(i)

```

```

wenyi

150

260

['piao', '666', 'fish']

zhangdechou

1

2

3

4

5

6

67

```

# for+break

```python

wenyi_info_list = ['wenyi', 150, 260, ['piao', '666', 'fish'],'zhangdechou',1,2,3,4,5,6,67,]

for i in wenyi_info_list:

if i == 'zhangdechou':

break

print(i)

```

```

wenyi

150

260

['piao', '666', 'fish']

```

# for+continue

```python

wenyi_info_list = ['wenyi', 150, 260, ['piao', '666', 'fish'],'zhangdechou',1,2,3,4,5,6,67,]

for i in wenyi_info_list:

if i =='zhangdechou':

continue

print(i)

```

```

wenyi

150

260

['piao', '666', 'fish']

1

2

3

4

5

6

67

```

# for else 如果for循环没有被break掉，则会运行else下面的代码

```python

wenyi_info_list = ['wenyi', 150, 260, ['piao', '666', 'fish'],'zhangdechou',1,2,3,4,5,6,67,]

for i in wenyi_info_list:

if i == 260:

break

print(i)

else:

print('我没有被break')

```

```

wenyi

150

```

 

```python

wenyi_info_list = ['wenyi', 150,['piao', '666', 'fish'],'zhangdechou',1,2,3,4,5,6,67,]

for i in wenyi_info_list:

if i == 260:

break

print(i)

else:

print('我没有被break')

```

```

wenyi

150

['piao', '666', 'fish']

zhangdechou

1

2

3

4

5

6

67

我没有被break

```

# while和for循环异同

异：while循环需要条件，for循环不需要条件

同：都是循环

# for循环实现loading......

```python

for i in range(0,6):

print('.')

```

```

.

.

.

.

.

.

```

 

```python

for i in range(0,6):

print('.',end = '')

```

```

......

```

```python

import time

s = 'loading'

print(s,end = '')

for i in range(0,6):

print('#',end='')

time.sleep(1)#字符出现时间间隔1秒

```

```

loading######

```

```python

import time

for i in range(0,6):

if i == 0:

print('[#',end = '')

if i == 4:

print('#]',end = '')

print('#',end = '')

time.sleep(0.5)

```

```

[######]##

```

```python

```