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