python之函数

  1 '''
  2 y=2*x+1
  3 x=3
  4 y->7
  5 x=3
  6 y->7
  7 '''
  8 # def test(x):
  9 #     '''
 10 #     2*x+1
 11 #     :param x:整形数字
 12 #     :return: 返回计算结果
 13 #     '''
 14 #     y=2*x+1
 15 #     return y
 16 #
 17 # def test():
 18 #     '''
 19 #     2*x+1
 20 #     :param x:整形数字
 21 #     :return: 返回计算结果
 22 #     '''
 23 #     x=3
 24 #     y=2*x+1
 25 #     return y
 26 # a=test()
 27 # print(a)
 28 
 29 #过程：就是没有返回值的函数
 30 
 31 
 32 # def test01():
 33 #     msg = 'test01'
 34 #     print(msg)
 35 #
 36 #
 37 # def test02():
 38 #     msg = 'test02'
 39 #     print(msg)
 40 #     return msg
 41 #
 42 # def test03():
 43 #     msg = 'test03'
 44 #     print(msg)
 45 #     return 1,2,3,4,'a',['alex'],{'name':'alex'},None
 46 #
 47 # def test04():
 48 #     msg = 'test03'
 49 #     print(msg)
 50 #     return {'name':'alex'}
 51 # t1=test01()
 52 # t2=test02()
 53 # t3=test03()
 54 # t4=test04()
 55 # print(t1)
 56 # print(t2)
 57 # print(t3)
 58 # print(t4)
 59 
 60 
 61 
 62 
 63 
 64 
 65 
 66 # def calc(x,y): #x=2,y=3
 67 #     res=x**y
 68 #     return x
 69 #     return y
 70 # res=calc(2,3)
 71 # # print(x)
 72 # # print(y)
 73 # print(res)
 74 # # a=10
 75 # # b=10
 76 # # calc(a,b)
 77 
 78 
 79 # def test(x,y,z):#x=1,y=2,z=3
 80 #     print(x)
 81 #     print(y)
 82 #     print(z)
 83 
 84 #位置参数，必须一一对应，缺一不行多一也不行
 85 # test(1,2,3)
 86 
 87 #关键字参数，无须一一对应，缺一不行多一也不行
 88 # test(y=1,x=3,z=4)
 89 
 90 #位置参数必须在关键字参数左边
 91 # test(1,y=2,3)#报错
 92 # test(1,3,y=2)#报错
 93 # test(1,3,z=2)
 94 # test(1,3,z=2,y=4)#报错
 95 # test(z=2,1,3)#报错
 96 
 97 # def handle(x,type='mysql'):
 98 #     print(x)
 99 #     print(type)
100 # handle('hello')
101 # handle('hello',type='sqlite')
102 # handle('hello','sqlite')
103 
104 # def install(func1=False,func2=True,func3=True):
105 #     pass
106 
107 #参数组：**字典 *列表
108 # def test(x,*args):
109 #     print(x)
110 #     print(args)
111 
112 
113 # test(1)
114 # test(1,2,3,4,5)
115 # test(1,{'name':'alex'})
116 # test(1,['x','y','z'])
117 # test(1,*['x','y','z'])
118 # test(1,*('x','y','z'))
119 
120 # def test(x,**kwargs):
121 #     print(x)
122 #     print(kwargs)
123 # test(1,y=2,z=3)
124 # test(1,1,2,2,2,2,2,y=2,z=3)
125 # test(1,y=2,z=3,z=3)#会报错 ：一个参数不能传两个值
126 
127 # def test(x,*args,**kwargs):
128 #     print(x)
129 #     print(args,args[-1])
130 #     print(kwargs,kwargs.get('y'))
131 # test(1,1,2,1,1,11,1,x=1,y=2,z=3) #报错
132 # test(1,1,2,1,1,11,1,y=2,z=3)
133 
134 # test(1,*[1,2,3],**{'y':1})

 1 # def bar():
 2 #     print('from bar')
 3 # def foo():
 4 #     print('from foo')
 5 #     bar()
 6 #
 7 # foo()
 8 
 9 
10 
11 # def foo():
12 #     print('from foo')
13 #     bar()
14 # def bar():
15 #     print('from bar')
16 #
17 # foo()

 1 name='海风'
 2 def huangwei():
 3     name = "黄伟"
 4     print(name)
 5     def liuyang():
 6         name = "刘洋"
 7         print(name)
 8         def nulige():
 9             name = '炉指花'
10             print(name)
11         print(name)
12         nulige()
13     liuyang()
14     print(name)
15 
16 print(name)
17 huangwei()
18 print(name)

 1 #递归
 2 # def calc(n):
 3 #     print(n)
 4 #     if int(n / 2) == 0:
 5 #         return n
 6 #     res=calc(int(n / 2))
 7 #     return res
 8 #
 9 #
10 # res=calc(10)
11 # print(res)

 1 # lambda x:x+1
 2 
 3 
 4 # def calc(x):
 5 #     return x+1
 6 #
 7 # res=calc(10)
 8 # print(res)
 9 # print(calc)
10 
11 # print(lambda x:x+1)
12 # func=lambda x:x+1
13 # print(func(10))
14 
15 # name='alex' #name='alex_sb'
16 # def change_name(x):
17 #     return name+'_sb'
18 #
19 # res=change_name(name)
20 # print(res)
21 #
22 # func=lambda x:x+'_sb'
23 # res=func('ds')
24 # print('匿名函数的运行结果',res)
25 
26 
27 # func=lambda x,y,z:x+y+z
28 # print(func(1,2,3))
29 
30 
31 # name1='alex'
32 # name2='sbalex'
33 # name1='supersbalex'
34 
35 
36 
37 # def test(x,y,z):
38 #     return x+1,y+1  #----->(x+1,y+1)
39 #
40 # lambda x,y,z:(x+1,y+1,z+1)

 1 num_l=[1,2,10,5,3,7]
 2 num1_l=[1,2,10,5,3,7]
 3 
 4 ret=[]
 5 # for i in num_l:
 6 #     ret.append(i**2)
 7 #
 8 # print(ret)
 9 
10 # def map_test(array):
11 #     ret=[]
12 #     for i in num_l:
13 #         ret.append(i**2)
14 #     return ret
15 
16 # ret=map_test(num_l)
17 # rett=map_test(num1_l)
18 # print(ret)
19 # print(rett)
20 
21 # num_l=[1,2,10,5,3,7]
22 # # #lambda x:x+1
23 # def add_one(x):
24 #     return x+1
25 # # #lambda x:x-1
26 # def reduce_one(x):
27 #     return x-1
28 #
29 # #lambda x:x**2
30 # def pf(x):
31 #     return x**2
32 #
33 # def map_test(func,array):
34 #     ret=[]
35 #     for i in num_l:
36 #         res=func(i) #add_one(i)
37 #         ret.append(res)
38 #     return ret
39 # print(map_test(add_one,num_l))
40 # print(map_test(lambda x:x+1,num_l))
41 
42 
43 # print(map_test(reduce_one,num_l))
44 # print(map_test(lambda x:x-1,num_l))
45 
46 # print(map_test(pf,num_l))
47 # print(map_test(lambda x:x**2,num_l))
48 
49 
50 
51 #终极版本
52 def map_test(func,array): #func=lambda x:x+1    arrary=[1,2,10,5,3,7]
53     ret=[]
54     for i in array:
55         res=func(i) #add_one(i)
56         ret.append(res)
57     return ret
58 
59 # print(map_test(lambda x:x+1,num_l))
60 res=map(lambda x:x+1,num_l)
61 # print('内置函数map，处理结果',res)
62 # for i in res:
63 #     print(i)
64 # print(list(res))
65 # print('传的是有名函数',list(map(reduce_one,num_l)))
66 #
67 #
68 # msg='linhaifeng'
69 # print(list(map(lambda x:x.upper(),msg)))

 1 # movie_people=['sb_alex','sb_wupeiqi','linhaifeng','sb_yuanhao']
 2 #
 3 #
 4 #
 5 #
 6 # def filter_test(array):
 7 #     ret=[]
 8 #     for p in array:
 9 #         if not p.startswith('sb'):
10 #                ret.append(p)
11 #     return ret
12 #
13 # res=filter_test(movie_people)
14 # print(res)
15 
16 
17 # movie_people=['alex_sb','wupeiqi_sb','linhaifeng','yuanhao_sb']
18 # def sb_show(n):
19 #     return n.endswith('sb')
20 #
21 # def filter_test(func,array):
22 #     ret=[]
23 #     for p in array:
24 #         if not func(p):
25 #                ret.append(p)
26 #     return ret
27 #
28 # res=filter_test(sb_show,movie_people)
29 # print(res)
30 
31 #终极版本
32 # movie_people=['alex_sb','wupeiqi_sb','linhaifeng','yuanhao_sb']
33 # def sb_show(n):
34 #     return n.endswith('sb')
35 # # --->lambda n:n.endswith('sb')
36 #
37 # def filter_test(func,array):
38 #     ret=[]
39 #     for p in array:
40 #         if not func(p):
41 #                ret.append(p)
42 #     return ret
43 #
44 # res=filter_test(lambda n:n.endswith('sb'),movie_people)
45 # print(res)
46 #
47 # #filter函数
48 movie_people=['alex_sb','wupeiqi_sb','linhaifeng','yuanhao_sb']
49 # print(filter(lambda n:not n.endswith('sb'),movie_people))
50 #
51 #
52 #
53 # res=filter(lambda n:not n.endswith('sb'),movie_people)
54 # print(list(res))
55 #
56 #
57 # print(list(filter(lambda n:not n.endswith('sb'),movie_people)))
58 
59 print(list(filter(lambda n:not n.endswith('sb'),movie_people)))

 1 # print(abs(-1))
 2 # print(abs(1))
 3 #
 4 # print(all([1,2,'1']))
 5 # print(all([1,2,'1','']))
 6 # print(all(''))
 7 
 8 # print(any([0,'']))
 9 # print(any([0,'',1]))
10 
11 
12 # print(bin(3))
13 
14 #空，None，0的布尔值为False，其余都为True
15 # print(bool(''))
16 # print(bool(None))
17 # print(bool(0))
18 
19 
20 name='你好'
21 # print(bytes(name,encoding='utf-8'))
22 # print(bytes(name,encoding='utf-8').decode('utf-8'))
23 #
24 # print(bytes(name,encoding='gbk'))
25 # print(bytes(name,encoding='gbk').decode('gbk'))
26 #
27 # print(bytes(name,encoding='ascii'))#ascii不能编码中文
28 
29 # print(chr(46))
30 
31 # print(dir(dict))
32 
33 # print(divmod(10,3))
34 
35 # dic={'name':'alex'}
36 # dic_str=str(dic)
37 # print(dic_str,type(dic_str))
38 
39 #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
40 # print(hash('12sdfdsaf3123123sdfasdfasdfasdfasdfasdfasdfasdfasfasfdasdf'))
41 # print(hash('12sdfdsaf31231asdfasdfsadfsadfasdfasdf23'))
42 #
43 # name='alex'
44 # print(hash(name))
45 # print(hash(name))
46 #
47 #
48 # print('--->before',hash(name))
49 # name='sb'
50 # print('=-=>after',hash(name))
51 
52 
53 # print(help(all))
54 
55 # print(bin(10))#10进制->2进制
56 # print(hex(12))#10进制->16进制
57 # print(oct(12))#10进制->8进制
58 
59 
60 
61 # print(isinstance(1,int))
62 # print(isinstance('abc',str))
63 # print(isinstance([],list))
64 # print(isinstance({},dict))
65 # print(isinstance({1,2},set))
66 
67 # name='哈哈哈哈哈哈哈哈哈哈哈哈哈哈啊哈粥少陈'
68 # print(globals())
69 # print(__file__)
70 #
71 # def test():
72 #     age='1111111111111111111111111111111111111111111111111111111111111'
73 #     # print(globals())
74 #     print(locals())
75 #
76 # test()
77 
78 # l=[1,3,100,-1,2]
79 # print(max(l))
80 # print(min(l))