day17-python之文件操作

1.内置函数

 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 # print(abs(-1))
 # print(abs(1))
 #
 # print(all([1,2,'1']))
 # print(all([1,2,'1','']))
 # print(all(''))

 # print(any([0,'']))
 # print(any([0,'',1]))

 # print(bin(3))

 #空，None，0的布尔值为False，其余都为True
 # print(bool(''))
 # print(bool(None))
 # print(bool(0))

 name='你好'
 # print(bytes(name,encoding='utf-8'))
 # print(bytes(name,encoding='utf-8').decode('utf-8'))
 #
 # print(bytes(name,encoding='gbk'))
 # print(bytes(name,encoding='gbk').decode('gbk'))
 #
 # print(bytes(name,encoding='ascii'))#ascii不能编码中文

 # print(chr(46))

 # print(dir(dict))
 #
 # print(divmod(10,3))

 # dic={'name':'alex'}
 # dic_str=str(dic)
 # print(dic_str)

 #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('12sdfdsaf3123123sdfasdfasdfasdfasdfasdfasdfasdfasfasfdasdf'))
 # print(hash('12sdfdsaf31231asdfasdfsadfsadfasdfasdf23'))
 #
 # name='alex'
 # print(hash(name))
 # print(hash(name))
 #
 #
 # print('--->before',hash(name))
 # name='sb'
 # print('=-=>after',hash(name))

 # print(help(all))

 # print(bin(10))#10进制->2进制
 # print(hex(12))#10进制->16进制
 # print(oct(12))#10进制->8进制

 # print(isinstance(1,int))
 # print(isinstance('abc',str))
 # print(isinstance([],list))
 # print(isinstance({},dict))
 # print(isinstance({1,2},set))

 name='哈哈哈哈哈哈哈哈哈哈哈哈哈哈啊哈粥少陈'
 # print(globals())
 # print(__file__)
 #
 # def test():
 #     age='1111111111111111111111111111111111111111111111111111111111111'
 #     print(globals())
 #     print(locals())
 #
 # test()

 # l=[1,3,100,-1,2]
 # print(max(l))
 # print(min(l))
 #
 #
 # print(list(zip(('a','n','c'),(1,2,3))))
 # print(list(zip(('a','n','c'),(1,2,3,4))))
 # print(list(zip(('a','n','c','d'),(1,2,3))))
 #
 p={'name':'alex','age':18,'gender':'none'}
 # print(list(zip(p.keys(),p.values())))
 # print(list(p.keys()))
 # print(list(p.values()))
 #
 # print(list(zip(['a','b'],'12345')))

 # l=[1,3,100,-1,2]
 # print(max(l))
 # print(min(l))

 age_dic={'alex_age':18,'wupei_age':20,'zsc_age':100,'lhf_age':30}

 # print(max(age_dic.values()))
 #
 # #默认比较的是字典的key
 # print(max(age_dic))
 #
 # for item in zip(age_dic.values(),age_dic.keys()): #[(18,'alex_age')  (20,'wupeiqi_age') () () ()]
 #     print(item)
 #
 # print('=======>',list(max(zip(age_dic.values(),age_dic.keys()))))

 # l=[
 #     (5,'e'),
 #     (1,'b'),
 #     (3,'a'),
 #     (4,'d'),
 # ]
 # l1=['a10','b12','c10',100] #不同类型之间不能进行比较
 l1=['a10','a2','a10'] #不同类型之间不能进行比较
 # print(list(max(l1)))
 # print('--->',list(max(l1)))

 # l=[1,3,100,-1,2]
 # print(max(l))
 dic={'age1':18,'age2':10}
 # print(max(dic)) #比较的是key
 # print(max(dic.values())) #比较的是key，但是不知道是那个key对应的

 # print(max(zip(dic.values(),dic.keys()))) #结合zip使用
 #
 #
 people=[
     {'name':'alex','age':1000},
     {'name':'wupei','age':10000},
     {'name':'yuanhao','age':9000},
     {'name':'linhaifeng','age':18},
 ]
 # max(people,key=lambda dic:dic['age'])
 # print('周绍陈取出来没有',max(people,key=lambda dic:dic['age']))

 # ret=[]
 # for item in people:
 #     ret.append(item['age'])
 # print(ret)
 # max(ret)

 # print(chr(97))
 # print(ord('a'))

 # print(pow(3,3))  #3**3
 # print(pow(3,3,2))  #3**3%2

 # l=[1,2,3,4]
 # print(list(reversed(l)))
 # print(l)

 #
 # print(round(3.5))

 # print(set('hello'))

 # l='hello'
 # s1=slice(3,5)
 # s2=slice(1,4,2)
 # print(l[3:5])
 # print(l[s1])
 # print(l[s2])
 # print(s2.start)
 # print(s2.stop)
 # print(s2.step)

 l=[3,2,1,5,7]
 l1=[3,2,'a',1,5,7]
 # print(sorted(l))
 # print(sorted(l1)) #排序本质就是在比较大小，不同类型之间不可以比较大小
 # people=[
 #     {'name':'alex','age':1000},
 #     {'name':'wupei','age':10000},
 #     {'name':'yuanhao','age':9000},
 #     {'name':'linhaifeng','age':18},
 # ]
 # print(sorted(people,key=lambda dic:dic['age']))
 name_dic={
     'abyuanhao': 11900,
     'alex':1200,
     'wupei':300,
 }
 print(sorted(name_dic))
 #
 # print(sorted(name_dic,key=lambda key:name_dic[key]))
 #
 # print(sorted(zip(name_dic.values(),name_dic.keys())))

 # print(str('1'))
 # print(type(str({'a':1})))
 # dic_str=str({'a':1})
 # print(type(eval(dic_str)))

 # l=[1,2,3,4]
 # print(sum(l))
 # print(sum(range(5)))
 #
 #
 # print(type(1))
 #
 # msg='123'
 #
 # if type(msg) is str:
 #     msg=int(msg)
 #     res=msg+1
 #     print(res)

 # def test():
 #     msg='撒旦法阿萨德防撒旦浪费艾丝凡阿斯蒂芬'
 #     print(locals())
 #     print(vars())
 # test()
 # print(vars(int))

 #import------>sys----->__import__()
 # import test
 # test.say_hi()

 # import 'test'#报错
 module_name='test'
 m=__import__(module_name)
 m.say_hi()

2.文件处理读操作

 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 # f=open('陈粒',encoding='utf-8')
 # data=f.read()
 # print(data)
 # f.close()
 #
 # f=open('xxx')
 # data=f.read()
 # print(data)

 #r w a
 f=open('陈粒','r',encoding='utf-8')
 # data=f.read()
 # print(data)
 # print(f.readable())
 # print('第1行',f.readline(),end='')
 # print('第2行',f.readline())
 # print('第3行',f.readline())
 # # for i in range(1):
 # #     pass
 # print('第4行',f.readline())
 # print('第5行',f.readline())
 # print('第6行',f.readline())
 # print('第7行',f.readline())

 data=f.readlines()
 print(data)
 f.close()

3.文件处理写操作 不追加

 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 f=open('陈粒','w',encoding='utf8')
 # f.read()
 f.write('11111111\n')
 f.write('222222222\n')
 f.write('333\n4444\n555\n')
 # f.writable()
 # f.writelines(['555\n','6666\n'])
 # f.writelines(['555\n','6666\n',1]) # 文件内容只能是字符串，只能写字符串
 f.close()

4.文件处理写操作 追加

 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 f=open('陈粒','a',encoding='utf-8')
 f.write('写到文件最后')

5.文件处理其他模式

 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 # f=open('陈粒','r+',encoding='utf-8')
 # data=f.read()
 # print(data)
 # f.write('123sb')
 #
 #
 #
 # f.write('sb')

 #文件修改
 # src_f=open('陈粒','r',encoding='utf-8')
 # data=src_f.readlines()
 # src_f.close()
 # #
 # for i in data:
 #     print(i)
 # print(data)
 # dst_f=open('陈粒','w',encoding='utf-8')
 # data=dst_f.readlines()
 # dst_f.writelines(data)
 # dst_f.write(data[0])
 # dst_f.close()

 # with open('陈粒.txt','w') as f:
 #     f.write('1111\n')

 # src_f=open('陈粒.txt','r',encoding='utf-8')
 # dst_f=open('混吧','w',encoding='utf-8')
 # with open('陈粒.txt','r',encoding='utf-8') as src_f,\
 #         open('混吧','w',encoding='utf-8') as dst_f:
 #     data=src_f.read()
 #     dst_f.write(data)

 # f=open('陈粒.txt')
 # print(f.encoding) #查看文件编码