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python基础-循环

时间:2021-07-01 10:21:17 帮助过:27人阅读

for循环:

a = [11,22,33,44]

for i in a:
print (i)

结果:

11
22
33
44

while循环:

i=0
while i < 3: #i<3为循环条件,当条件为真时,执行后面的循环体;条件为假时不执行
print (i)
i += 1

结果:

0
1
2

break和Continue:

i= 0
while i < 10:
print ("i->:",i)
if i == 5:
break #当i==5时,退出所有循环
i += 1

结果:

i->: 0
i->: 1
i->: 2
i->: 3
i->: 4
i->: 5
x=0
while x < 9:
for x in range(0,10):
if x ==6:
continue #当x==6时,跳出当前循环,继续下一次循环
print("x->:", x)

结果:

x->: 0
x->: 1
x->: 2
x->: 3
x->: 4
x->: 5
x->: 7 #缺少x->: 6
x->: 8
x->: 9

其他:

enumrate:

a = ["aa","bb","cc","dd"]

for i in enumerate(a,5): #默认编号从0开始,可以手动变更
print (i)

结果:

(5, 'aa')
(6, 'bb')
(7, 'cc')
(8, 'dd')

range:

1、

for n in range(1, 10):
print (n)

结果:

1
2
3
4
5
6
7
8
9

2、

for x in range(0,20,4):
print (x)

结果:

0
4
8
12
16
#以4作为step,依次打印

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