day14-python之集合函数字符串格式化

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1.集合

 1 #!/usr/bin/env python
 2 # -*- coding:utf-8 -*-
 3 # s=set(['alex','alex','sb'])
 4 # print(s)
 5 
 6 # s=set('hello')
 7 # print(s)
 8 
 9 # s={1,2,3,4,5,6}
10 #添加  add 不能添加重复元素
11 # s.add('s')
12 # s.add('3')
13 # s.add(3)
14 # print(s)
15 
16 # s.clear()
17 # print(s)
18 
19 # s1=s.copy()
20 # print(s1)
21 
22 # s={'sb',1,2,3,4,5,6}
23 #随机删
24 # s.pop()
25 # print(s)
26 
27 #指定删除
28 # s.remove('sb')
29 # s.remove('hellol') #删除元素不存在会报错
30 # s.discard('sbbbb')#删除元素不存在不会报错
31 # print(s)
32 
33 # python_l=['lcg','szw','zjw','lcg']
34 # linux_l=['lcg','szw','sb']
35 # p_s=set(python_l)
36 # l_s=set(linux_l)
37 # #求交集
38 # print(p_s,l_s)
39 # print(p_s.intersection(l_s))
40 # print(p_s&l_s)
41 # #求并集
42 # print(p_s.union(l_s))
43 # print(p_s|l_s)
44 # #差集
45 # print('差集',p_s-l_s)
46 # print(p_s.difference(l_s))
47 # print('差集',l_s-p_s)
48 # print(l_s.difference(p_s))
49 
50 #交叉补集
51 # print('交叉补集',p_s.symmetric_difference(l_s))
52 # print('交叉补集',p_s^l_s)
53 
54 # python_l=['lcg','szw','zjw','lcg']
55 # linux_l=['lcg','szw','sb']
56 # p_s=set(python_l)
57 # l_s=set(linux_l)
58 # print(p_s,l_s)
59 # print('差集',p_s-l_s)
60 # p_s=p_s-l_s
61 # p_s.difference_update(l_s)
62 # print(p_s)
63 
64 # s1={1,2}
65 # s2={2,3,5}
66 # print(s1.isdisjoint(s2))
67 
68 # s1={1,2}
69 # s2={1,2,3}
70 # print(s1.issubset(s2))#s1 是s2 的子集
71 # print(s2.issubset(s1))#False
72 
73 # print(s2.issuperset(s1))#s1 是s2 的父集
74 
75 # s1={1,2}
76 # s2={1,2,3}
77 # s1.update(s2) #更新多个值
78 
79 # s1.add(1,2,3,4) #更新一个值
80 # s1.union(s2) #不更新
81 
82 # print(s1)
83 
84 # s=frozenset('hello')
85 # print(s)
86 # names=['alex','alex','wupeiqi']
87 # #
88 # names=list(set(names))
89 # print(names)

2.字符串格式化

 1 #!/usr/bin/env python
 2 # -*- coding:utf-8 -*-
 3 # msg='i am %s my hobby is %s' % ('lhf','alex')
 4 # print(msg)
 5 #
 6 # msg='i am %s my hobby is %s' % ('lhf',1)
 7 # msg='i am %s my hobby is %s' % ('lhf',[1,2])
 8 # print(msg)
 9 # name='lhf'
10 # age=19
11 # msg='i am %s my hobby is %s' % (name,age)
12 # print(msg)
13 
14 #打印浮点数
15 # tpl = "percent %.2f" % 99.976234444444444444
16 # print(tpl)
17 
18 #打印百分比
19 # tpl = 'percent %.2f %%' % 99.976234444444444444
20 # print(tpl)
21 
22 # tpl = "i am %(name)s age %(age)d" % {"name": "alex", "age": 18}
23 # print(tpl)
24 #
25 # msg='i am %(name)+60s my hobby is alex' %{'name':'lhf'}
26 # print(msg)
27 #
28 # msg='i am \033[43;1m%(name)+60s\033[0m my hobby is alex' %{'name':'lhf'}
29 # print(msg)
30 
31 
32 # print('root','x','0','0',sep=':')
33 # print('root'+':'+'x'+':'+'0','0')

3.format字符串格式化

 1 #!/usr/bin/env python
 2 # -*- coding:utf-8 -*-
 3 # tpl = "i am {name}, age {age}, really {name}".format(name="seven", age=18)
 4 
 5 # tpl = "i am {name}, age {age}, really {name}".format(**{"name": "seven", "age": 18})
 6 #
 7 # tpl = "i am {:s}, age {:d}".format(*["seven", 18])
 8 # tpl = "i am {:s}, age {:d}".format("seven", 18) #["seven", 18]
 9 
10 l=["seven", 18]
11 # tpl = "i am {:s}, age {:d}".format('seven',18)
12 # print(tpl)
13 #
14 # tpl = "numbers: {:b},{:o},{:d},{:x},{:X}, {:%},{}".format(15, 15, 15, 15, 15, 15.87623, 2)
15 # print(tpl)

4.函数

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

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