流程控制———for循环

 for循环的强大之处在于循环取值

l=['a','b','c','d','e']

# i=0
# while i < len(l):
#     print(l[i])
#     i+=1

# for x in l: # x='b'
#     print(x)

# dic={'name':'egon','age':18,'gender':'male'}
# for x in dic:
#     print(x,dic[x]

#for + break

# nums=[11,22,33,44,55]
# for x in nums:
#     if x == 44:
#         break
#     print(x)

#for + continue

nums=[11,22,33,44,55]
for x in nums:
    if x == 22 or x == 44:
        continue
    print(x)

#for + else

#for + else
# names=['egon','kevin1111_dsb','alex_dsb','mac_dsb']
#
# for name in names:
#     if name == 'kevin_dsb':
#         break
#     print(name)
# else:
#     print('======>')

#for+ range()　

# range的用法
>>> range(1,5)
[1, 2, 3, 4]
>>> for i in range(1,5):
...     print(i)