函数参数代码实例

#默认参数
def power(x, n = 2):
    ans = 1
    while n > 0:
        ans *= x
    return ans
print(power(3))

def calc(numbers):
    sum = 0
    for n in numbers:
        sum += n*n
    return sum
print(calc([1, 3, 4]))#调用的时候需要组装一个list或者tuple
print(calc((1, 4, 5)))
print(‘rain‘)

#可变参数
def calc(numbers):
    sum = 0
    for n in numbers:
        sum = sum +n*n
    return sum
nums = [1, 2, 4, 10]
print(calc(nums))
print(‘-----------------‘)
#可变参数
def calc(*numbers):
    sum = 0
    for n in numbers:
        sum = sum +n*n
    return sum
nums = [1, 2, 4, 10]
print(calc(*nums)) #加一个*把list或者tuple当成可变参数传进去
print(calc(1,2,3))#也可以直接传进去多个参数， 本质上nums接收到的是一个tuple
print(‘----------‘)
#关键字参数
def person(name, age, **kw):
    print(‘name:‘,name,‘age:‘, age, ‘other‘, kw)
person(‘Michael:‘, 30)
person(‘rain‘, 21, city = ‘xian‘)
person(‘rain‘, 21, city = ‘shanghhai‘,gender=‘M‘)
#也可以先组装出一个dict，然后，把该dict转换为关键字参数传进去：