动态参数
1.
def show(*arg):
print(arg,type(arg))
show(1,22,33,44)
(1, 22, 33, 44) <class 'tuple'> 转化为元组
2.
def show(**arg):
print(arg,type(arg))
show(n1=1,n2=22,n3=33,n4=44)
{'n1': 1, 'n2': 22, 'n3': 33, 'n4': 44} <class 'dict'> 转化为字典
3.
def show(*args,**kargs):
print(args,type(args))
print(kargs, type(kargs))
show(1,22,33,44,n1=55,k2=66)
(1, 22, 33, 44) <class 'tuple'> 转化为元组
{'n1': 55, 'k2': 66} <class 'dict'> 转化为字典
4.
def show(*args,**kargs):
print(args,type(args))
print(kargs, type(kargs))
l = [1,22,33,44]
d= {'n1':55,'k2':66}
show(*l,**d)
(1, 22, 33, 44) <class 'tuple'> 转化为元组
{'n1': 55, 'k2': 66} <class 'dict'> 转化为字典
使用动态参数实现字符串的格式化
1.
s = "{0} is {1}"
result = s.format('dan','beautiful')
print(result)
dan is beautiful
2.
l = ['dan','beautiful']
result = s.format(*l)
print(result)
dan is beautiful
3.
s = "{name} is {acter}"
result = s.format(name='dan',acter='nice')
print(result)
dan is nice
4.
d = {'name':'dan','acter':'nice'}
result = s.format(**d)
print(result)
dan is nice
