Python初学6-循环

1、for循环

普通遍历

a = ['aaa','bbb','ccc']
for x in a:
    print(x)

嵌套列表遍历

a = [['aaa','bbb','ccc'],(1,2,3)]
for x in a:
    print(x)

嵌套for循环遍历

a = [['aaa','bbb','ccc'],(1,2,3)]
for x in a:
    for y in x:
        print(y)

else

a = [1,2,3]
for x in a:
    print(x)
else:
    print('退出')

break

a = [1,2,3]
for x in a:
    if x == 2:
        break 
    else:
        print(x)

continue

a = [1,2,3]
for x in a:
    if x == 2:
        continue 
    else:
        print(x)

range()

'''
range(
            起始,
            长度 ,
            步长
)    
'''
for x in range(0,10,2):
    print(x,end=' ')
print()

a=['a','b','c','d']
for x in range(0,len(a),2):
    print(x,end=' ')
print()

b=a[0:len(a):2]
print(b)

2、while

count  = 0
while count<=10:
    count+=1
    print(count)
else:
    print('结束循环')