day14-python之集合函数字符串格式化

1.集合

 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 # s=set(['alex','alex','sb'])
 # print(s)

 # s=set('hello')
 # print(s)

 # s={1,2,3,4,5,6}
 #添加  add 不能添加重复元素
 # s.add('s')
 # s.add('3')
 # s.add(3)
 # print(s)

 # s.clear()
 # print(s)

 # s1=s.copy()
 # print(s1)

 # s={'sb',1,2,3,4,5,6}
 #随机删
 # s.pop()
 # print(s)

 #指定删除
 # s.remove('sb')
 # s.remove('hellol') #删除元素不存在会报错
 # s.discard('sbbbb')#删除元素不存在不会报错
 # print(s)

 # python_l=['lcg','szw','zjw','lcg']
 # linux_l=['lcg','szw','sb']
 # p_s=set(python_l)
 # l_s=set(linux_l)
 # #求交集
 # print(p_s,l_s)
 # print(p_s.intersection(l_s))
 # print(p_s&l_s)
 # #求并集
 # print(p_s.union(l_s))
 # print(p_s|l_s)
 # #差集
 # print('差集',p_s-l_s)
 # print(p_s.difference(l_s))
 # print('差集',l_s-p_s)
 # print(l_s.difference(p_s))

 #交叉补集
 # print('交叉补集',p_s.symmetric_difference(l_s))
 # print('交叉补集',p_s^l_s)

 # python_l=['lcg','szw','zjw','lcg']
 # linux_l=['lcg','szw','sb']
 # p_s=set(python_l)
 # l_s=set(linux_l)
 # print(p_s,l_s)
 # print('差集',p_s-l_s)
 # p_s=p_s-l_s
 # p_s.difference_update(l_s)
 # print(p_s)

 # s1={1,2}
 # s2={2,3,5}
 # print(s1.isdisjoint(s2))

 # s1={1,2}
 # s2={1,2,3}
 # print(s1.issubset(s2))#s1 是s2 的子集
 # print(s2.issubset(s1))#False

 # print(s2.issuperset(s1))#s1 是s2 的父集

 # s1={1,2}
 # s2={1,2,3}
 # s1.update(s2) #更新多个值

 # s1.add(1,2,3,4) #更新一个值
 # s1.union(s2) #不更新

 # print(s1)

 # s=frozenset('hello')
 # print(s)
 # names=['alex','alex','wupeiqi']
 # #
 # names=list(set(names))
 # print(names)

2.字符串格式化

 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 # msg='i am %s my hobby is %s' % ('lhf','alex')
 # print(msg)
 #
 # msg='i am %s my hobby is %s' % ('lhf',1)
 # msg='i am %s my hobby is %s' % ('lhf',[1,2])
 # print(msg)
 # name='lhf'
 # age=19
 # msg='i am %s my hobby is %s' % (name,age)
 # print(msg)

 #打印浮点数
 # tpl = "percent %.2f" % 99.976234444444444444
 # print(tpl)

 #打印百分比
 # tpl = 'percent %.2f %%' % 99.976234444444444444
 # print(tpl)

 # tpl = "i am %(name)s age %(age)d" % {"name": "alex", "age": 18}
 # print(tpl)
 #
 # msg='i am %(name)+60s my hobby is alex' %{'name':'lhf'}
 # print(msg)
 #
 # msg='i am \033[43;1m%(name)+60s\033[0m my hobby is alex' %{'name':'lhf'}
 # print(msg)

 # print('root','x','0','0',sep=':')
 # print('root'+':'+'x'+':'+'0','0')

3.format字符串格式化

 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 # tpl = "i am {name}, age {age}, really {name}".format(name="seven", age=18)

 # tpl = "i am {name}, age {age}, really {name}".format(**{"name": "seven", "age": 18})
 #
 # tpl = "i am {:s}, age {:d}".format(*["seven", 18])
 # tpl = "i am {:s}, age {:d}".format("seven", 18) #["seven", 18]

 l=["seven", 18]
 # tpl = "i am {:s}, age {:d}".format('seven',18)
 # print(tpl)
 #
 # tpl = "numbers: {:b},{:o},{:d},{:x},{:X}, {:%},{}".format(15, 15, 15, 15, 15, 15.87623, 2)
 # print(tpl)

4.函数

 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 '''
 y=2*x+1
 x=3
 y->7
 x=3
 y->7
 '''
 # def test(x):
 #     '''
 #     2*x+1
 #     :param x:整形数字
 #     :return: 返回计算结果
 #     '''
 #     y=2*x+1
 #     return y
 #
 # def test():
 #     '''
 #     2*x+1
 #     :param x:整形数字
 #     :return: 返回计算结果
 #     '''
 #     x=3
 #     y=2*x+1
 #     return y
 # a=test()
 # print(a)

 #过程：就是没有返回值的函数

 # def test01():
 #     msg = 'test01'
 #     print(msg)
 # #
 # #
 # def test02():
 #     msg = 'test02'
 #     print(msg)
 #     return msg
 # #
 # def test03():
 #     msg = 'test03'
 #     print(msg)
 #     return 1,2,3,4,'a',['alex'],{'name':'alex'},None
 # #
 # def test04():
 #     msg = 'test03'
 #     print(msg)
 #     return {'name':'alex'}
 # t1=test01()
 # t2=test02()
 # t3=test03()
 # t4=test04()
 # print(t1)
 # print(t2)
 # print(t3)
 # print(t4)

 # def calc(x,y): #x=2,y=3
 #     res=x**y
 #     return x
 #     return y
 # res=calc(2,3)
 # print(x)
 # print(y)
 # print(res)
 # # a=10
 # # b=10
 # # calc(a,b)

 # def test(x,y,z):#x=1,y=2,z=3
 #     print(x)
 #     print(y)
 #     print(z)

 #位置参数，必须一一对应，缺一不行多一也不行
 # test(1,2,3)

 #关键字参数，无须一一对应，缺一不行多一也不行
 # test(y=1,x=3,z=4)

 #位置参数必须在关键字参数左边
 # test(1,y=2,3)#报错
 # test(1,3,y=2)#报错
 # test(1,3,z=2)
 # test(1,3,z=2,y=4)#报错
 # test(z=2,1,3)#报错

 # def handle(x,type='mysql'):
 #     print(x)
 #     print(type)
 # handle('hello')
 # handle('hello',type='sqlite')
 # handle('hello','sqlite')

 # def install(func1=False,func2=True,func3=True):
 #     pass

 #参数组：**字典 *列表
 # def test(x,*args):
 #     print(x)
 #     print(args)

 # test(1)
 # test(1,2,3,4,5)
 # test(1,{'name':'alex'})
 # test(1,['x','y','z'])
 # test(1,*['x','y','z'])
 # test(1,*('x','y','z'))

 # def test(x,**kwargs):
 #     print(x)
 #     print(kwargs)
 # test(1,y=2,z=3)
 # test(1,1,2,2,2,2,2,y=2,z=3)
 # test(1,y=2,z=3,z=3)#会报错 ：一个参数不能传两个值

 def test(x,*args,**kwargs):
     print(x)
     print(args,args[-1])
     print(kwargs,kwargs.get('y'))
 # test(1,1,2,1,1,11,1,x=1,y=2,z=3) #报错
 # test(1,1,2,1,1,11,1,y=2,z=3)
 #
 # test(1,*[1,2,3],**{'y':1})