python入门指南：控制语句

Posted 2021-01-14 awildfish

条件控制

if，if-else，if-elseif-else

#!/bin/python

a = ‘test‘
if a == ‘test‘:
    print(‘a is %s‘  %(a))
else:
    print(‘a is not test‘)

if a == ‘test‘:
    print(‘a is test‘)

a = ‘other‘
if a == ‘test‘:
    print(‘a is test‘)
elif a == ‘test1‘:
    print(‘a is test1‘)
else:
    print(‘a is not test or test1‘)

输出结果：

a is test
a is test
a is not test or test1

 

for循环控制

for循环中，加入控制流程：for-continue（继续循环），for-break（跳出循环）

#!/bin/python

for i in range(1, 3): 
    print(i)

for i in [1, 2, 3]: 
    print(i)

for i in range(0, 100):
    if i <= 20: 
        continue
    else:
        if i >= 25: 
            break
        else:
            print(i)

输出结果：

1
2
1
2
3
21
22
23
24

 

while循环控制

#!/bin/python

i = 0 
while i <= 20: 
    if i < 10: 
        i += 1
        continue;
    elif i >= 10 and i <= 15: 
        i += 1
    elif i == 16: 
        break
    else:
        i += 1
    print(i)

输出结果：

11
12
13
14
15
16