Python函数2

发表于

空函数

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def nop():
    pass

函数参数

默认参数

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def involution(x,n=2):
    s=1
    while n>0:
	n=n-1
	s=s*x
    return s

print(involution(6))
print(involution(5,3))
##output:36
##output:125

可变参数

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def calc(*numbers):
    s=0
    for n in numbers:
	s=s+n*n
    return sum

print(calc(1,2,3))
print(calc(1,3,5,7))
##output:14
##output:84

任意数相加

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def calc(*numbers):
    sum=0
    for i in numbers:
	sum=sum+i
    return sum

print(calc(1,2,3,4,5))
##output:15

平均数

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def calc(*numbers):
    sum=0
    for n in numbers:
	sum=sum+n
    if len(numbers)>0:
	avg=sum/len(numbers)
    return avg

print(calc(1,2,3,4,5))
##output:3.0

匿名函数

lambda x: x*x (关键字lambda表示匿名函数，冒号前的x表示函数参数,后边是表达式)

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f1=lambda x:x*x
print(f1(5))
##output:25

f2=lambda x,y,z:x+y+z
print(f2(4,5,6))
##output:15