num_1 = [10,2,3,4]

def map_test(array):

    ret = []

    for i in num_1:

        ret.append(i**2)     # 列表里每个元素都平方

    return ret

res = map_test(num_1)

print(res)

[100, 4, 9, 16]

Process finished with exit code 0

num_1 = [10,2,3,4]

def add_one(x):                       #  用匿名函数就不用定义这里

    return x+1

def reduce_one(x):                    #  用匿名函数就不用定义这里

    return x-1

def map_test(func,array):

    ret = []

    for i in array:

       res= func(i)

       ret.append(res)

    return ret

print(map_test(add_one,num_1))

print(map_test(lambda x:x+1,num_1))          # 也可以用 直接用匿名函数，就不用定义前面那些函数了

print(map_test(reduce_one,num_1))

print(map_test(lambda x:x-1,num_1))           # 匿名函数

print(map_test(lambda x:x**2,num_1))          # 匿名函数

[11, 3, 4, 5]

[11, 3, 4, 5]

[9, 1, 2, 3]

[9, 1, 2, 3]

[100, 4, 9, 16]

Process finished with exit code 0

msg = 'abc'

res = list(map(lambda  x:x.upper(),msg))

print(res)

['A', 'B', 'C']

Process finished with exit code 0