Python中部分好用的内置函数

Python中部分好用的内置函数

str = ['d','o','g','a']

# 剔除
def clean(s):
    if s != 'a':
        return s

ret = filter(clean,str)
print(list(ret))

# 追加
def addchar(s):
    return s+'walk'

ret = map(addchar,str)
print(list(ret))

from functools import reduce

# 迭代
def add(x, y):
    return x + y

def multi(x, y):
    return x * y

ret_add = reduce(add, range(1,6))
ret_multi = reduce(multi, range(1,6))

print(ret_add)
print(ret_multi)

print(reduce(lambda a, b : a * b, range(1,6)))

执行效果如下:

['d', 'o', 'g']
['dwalk', 'owalk', 'gwalk', 'awalk']
15
120
120