num_l=[1,2,10,5,3,7]# 计算该列表中数的平方值

方法一：

# ret=[]

# for i in num_l:

#     ret.append(i**2)

# print(ret)

方法二：

def map_test(array):

    ret=[]

    for i in num_l:

        ret.append(i**2)   #

return ret

ret=map_test(num_l)

print(ret)
方法三：

num_l=[1,2,10,5,3,7]
#lambda x:x+1
def add_one(x):
    return x+1
#lambda x:x-1
def reduce_one(x):
    return x-1
#lambda x:x**2
def square_one(x):
    return x**2
def map_test(func,array):
    ret=[]
    for i in num_l:
        res=func(i)
        ret.append(res)
    return ret
print(map_test(add_one,num_l))
print(map_test(reduce_one,num_l))
#print(map_test(lambda x:x**2,num_l))
print(map_test(square_one,num_l))

#终极版本
num_l=[1,2,10,5,3,7]
def map_test(func,array):
    ret=[]
    for i in num_l:
        res=func(i) #add_one
        ret.append(res)
    return ret

print(map_test(lambda x:x+1,num_l))
res=map(lambda x:x+1,num_l)
print('内置函数map，处理结果',res)
# for i in res:
#     print(i)
print(list(res))
print('传的是有名函数',list(map(reduce_one,num_l)))

#大写转换
msg='wuxiping'
print(list(map(lambda x:x.upper(),msg)))

# movie_people=['sb_alex','sb_wupeiqi','linhaifeng','sb_yuanhao']

# def filter_test(array):

#     ret=[]

#     for p in array:

#         if not p.startswith('sb'):

#             ret.append(p)

#     return ret

# print(filter_test(movie_people))

# movie_people=['alex_sb','wupeiqi_sb','linhaifeng','yuanhao_sb']

# def sb_show(n):

#     return n.endswith('sb')

# def filter_test(func,array):

#     ret=[]

#     for p in array:

#         if not func(p):

#             ret.append(p)

#     return ret

# res=filter_test(sb_show,movie_people)

# print(res)

#终极版本

movie_people=['alex_sb','wupeiqi_sb','linhaifeng','yuanhao_sb']

# def sb_show(n):

#     return n.endswith('sb')

#lambda n:n.endswith('sb')

def filter_test(func,array):

    ret=[]

    for p in array:

        if not func(p):

            ret.append(p)

    return ret

res=filter_test(lambda n:n.endswith('sb'),movie_people)

print(res)

#filter函数
movie_people=['alex_sb','wupeiqi_sb','linhaifeng','yuanhao_sb']
#print(filter(lambda n:n not n.endswith('sb',movie_people)))
res=filter(lambda n:not n.endswith('sb'),movie_people)
print(list(res))

from functools import reduce

# num_l=[1,2,3,100]

# res=0

# for num in num_l:

#     res+=num

# print(res)

#相加

# num_l=[1,2,3,100]

# def reduce_test(array):

#     res=0

#     for num in num_l:

#         res+=num

#     return res

# print(reduce_test(num_l))

#相乘

# num_l=[1,2,3,100]

# def reduce_test(func,array):

#     res=array.pop(0)

#     for num in array:

#         res=func(res,num)

#     return res

# print(reduce_test(lambda x,y:x*y,num_l))

# 指定初始值

# num_l=[1,2,3,100]

# def reduce_test(func,array,init=None):

#     if init is None:

#         res=array.pop(0)

#     else:

#         res=init

#     for num in array:

#         res=func(res,num)

#     return res

# print(reduce_test(lambda x,y:x*y,num_l,100))

#reduce函数

num_l=[1,2,3,100]

print(reduce(lambda x,y:x+y,num_l,1))

print(reduce(lambda x,y:x+y,num_l,))

#总结：

# map函数：处理序列中的每个元素，得到的结果是一个‘列表’，该‘列表’元素个数和位置与原来一样

#filter函数：遍历序列中的每个元素，判断每个元素得到布尔值，如果是True则留下来得到的结果是一个‘列表’

# people=[{'name':'alex','age':10000},

#         {'name': 'wupeiqi', 'age': 10000},

#         {'name': 'yuanhao', 'age': 9000},

#         {'name': 'linhaifeng', 'age': 18},]

# print(list(filter(lambda p:p['age']<=18,people)))

#reduce函数：处理 一个序列，把序列进行合并操作

# num_l=[1,2,3,100]

# print(reduce(lambda x,y:x+y,num_l,1))

# print(reduce(lambda x,y:x+y,num_l,))

# print(abs(-1))

# print(all([1,2,'1']))#做布尔运算（所有的都是True才返回True）

# name='你好'

# print(bytes(name,encoding='utf-8'))   #编码，三个字节

# print(bytes(name,encoding='utf-8').decode('utf-8'))# 解码

# print(bytes(name,encoding='gbk'))#两个字节

# print(bytes(name,encoding='gbk').decode('gbk'))

# #print(bytes(name,encoding='ascii'))#ascii 不能编码中文

# print(chr(100))

# print(dir(all))

# print(divmod(10,3))

# dic={'name':'alex'}

# dic_str=str(dic)

# print(dic_str)

# print(eval(dic_str))
eval（）函数：以Python的方式解析并执行字符串，并将返回的结果输出

# d1=eval(dic_str)#把字符串中的数据结构给提取出来

# print(d1['name'])

# a='1+2*(3/3-1)-2'#把字符串中的表达式进行运算

# print(eval(a))

#可hash的数据类型即不可变数据类型，不可hash的数据类型即可变数据类型

# print(hash('dhfsaklefownfs2134254'))

# print(hash('-03thjsdnfkgqopw3utjlsdfml;'))

# name='alex'

# print(hash(name))

# print(hash(name))

# print(hash(name))

# print(help(dir))

# print(bin(10))  #10进制转换成2进制

# print(hex(12))   #16

# print(oct(12))   #8

# print(isinstance(1,int))

# print(isinstance('abc',int))

# print(isinstance('abc',str))

name='哈哈哈哈'

print(globals())

print(__file__)

print(locals())