‘’’
1、循环嵌套不局限于某种循环形式，可以任意嵌套
2、逻辑：外层循环执行一次，内层循环执行一轮
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def loop_info():
date = [[1,2,3,4,5,6,7],
[‘A’,‘B’,‘C’,‘D’],
[‘Hello’,‘World’,‘Python’,‘Hogwarst’]
]
#嵌套形式一
# for iterm in date:
# for n in iterm:
# print(n,end=‘’)
# print()
#嵌套形式二
# i = 0
# len1 = len(date)
# while i < len1:
# iterm = date[i]
# j = 0
# while j < len(iterm):
# iterm1 = iterm[j]
# j +=1
# print(iterm1,end=‘’)
# print()
# i += 1
#嵌套形式三：九九乘法表
for i in range(1,10):
for j in range(1,i+1):
print(f’{j}{i}={ij:<2}‘,end=’ ‘)
print()
date = [[1,2,3,4,5,6,7],
[‘A’,‘B’,‘C’,‘D’,‘E’],
[‘Hello’,‘World’,‘Python’,‘Hogwarst’]
]
#实战一 for-in嵌套 while
# for i in date:
# j = 0
# len1 = len(i)
# while j < len1:
# print(i[j],end=’ ‘)
# j += 1
# print()
# #实战二：while嵌套fot-in
# i = 0
# len2 = len(date)
# while i < len2:
# iterm = date[i]
# for j in iterm:
# if j != iterm[len(iterm)-1]:
# print(j,end=’-‘)
# else:
# print(j,end=’ ')
# print()
# i+=1
if name == ‘main’:
loop_info()