三种拼接字符串方式：
a='aa'
b ='bb'
msg0 ='''
a:%s
b:%s
'''%(a, b)
msg1 ='''
a:{_a}
b:{_b}
'''.format(_a=a,_b= b)
msg2 ='''
a:{0}
b:{1}
'''.format(a, b)
while for特殊用法：
while else for else
she浅拷贝:
importcopy
name = ['aa','bb','cc',['dd','ee','ff','gg']]
name2 = name.copy()
name3 = copy.copy(name)
name4 = copy.deepcopy(name)
name[0] ='AA'
name[3][0] ='DD'
print(name)
print(name2)
print(name3)
print(name4)
----> ['AA', 'bb', 'cc', ['DD', 'ee', 'ff', 'gg']]
['aa', 'bb', 'cc', ['DD', 'ee', 'ff', 'gg']]
['aa', 'bb', 'cc', ['DD', 'ee', 'ff', 'gg']]
['aa', 'bb', 'cc', ['dd', 'ee', 'ff', 'gg']]
