day17-python之文件操作
1.内置函数
1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 # print(abs(-1)) 4 # print(abs(1)) 5 # 6 # print(all([1,2,'1'])) 7 # print(all([1,2,'1',''])) 8 # print(all('')) 9 10 # print(any([0,''])) 11 # print(any([0,'',1])) 12 13 14 # print(bin(3)) 15 16 #空，None，0的布尔值为False，其余都为True 17 # print(bool('')) 18 # print(bool(None)) 19 # print(bool(0)) 20 21 name='你好' 22 # print(bytes(name,encoding='utf-8')) 23 # print(bytes(name,encoding='utf-8').decode('utf-8')) 24 # 25 # print(bytes(name,encoding='gbk')) 26 # print(bytes(name,encoding='gbk').decode('gbk')) 27 # 28 # print(bytes(name,encoding='ascii'))#ascii不能编码中文 29 30 # print(chr(46)) 31 32 # print(dir(dict)) 33 # 34 # print(divmod(10,3)) 35 36 # dic={'name':'alex'} 37 # dic_str=str(dic) 38 # print(dic_str) 39 40 #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 41 # print(hash('12sdfdsaf3123123sdfasdfasdfasdfasdfasdfasdfasdfasfasfdasdf')) 42 # print(hash('12sdfdsaf31231asdfasdfsadfsadfasdfasdf23')) 43 # 44 # name='alex' 45 # print(hash(name)) 46 # print(hash(name)) 47 # 48 # 49 # print('--->before',hash(name)) 50 # name='sb' 51 # print('=-=>after',hash(name)) 52 53 54 # print(help(all)) 55 56 # print(bin(10))#10进制->2进制 57 # print(hex(12))#10进制->16进制 58 # print(oct(12))#10进制->8进制 59 60 61 62 # print(isinstance(1,int)) 63 # print(isinstance('abc',str)) 64 # print(isinstance([],list)) 65 # print(isinstance({},dict)) 66 # print(isinstance({1,2},set)) 67 68 name='哈哈哈哈哈哈哈哈哈哈哈哈哈哈啊哈粥少陈' 69 # print(globals()) 70 # print(__file__) 71 # 72 # def test(): 73 # age='1111111111111111111111111111111111111111111111111111111111111' 74 # print(globals()) 75 # print(locals()) 76 # 77 # test() 78 79 # l=[1,3,100,-1,2] 80 # print(max(l)) 81 # print(min(l)) 82 # 83 # 84 # print(list(zip(('a','n','c'),(1,2,3)))) 85 # print(list(zip(('a','n','c'),(1,2,3,4)))) 86 # print(list(zip(('a','n','c','d'),(1,2,3)))) 87 # 88 p={'name':'alex','age':18,'gender':'none'} 89 # print(list(zip(p.keys(),p.values()))) 90 # print(list(p.keys())) 91 # print(list(p.values())) 92 # 93 # print(list(zip(['a','b'],'12345'))) 94 95 96 # l=[1,3,100,-1,2] 97 # print(max(l)) 98 # print(min(l)) 99 100 101 age_dic={'alex_age':18,'wupei_age':20,'zsc_age':100,'lhf_age':30} 102 103 # print(max(age_dic.values())) 104 # 105 # #默认比较的是字典的key 106 # print(max(age_dic)) 107 # 108 # for item in zip(age_dic.values(),age_dic.keys()): #[(18,'alex_age') (20,'wupeiqi_age') () () ()] 109 # print(item) 110 # 111 # print('=======>',list(max(zip(age_dic.values(),age_dic.keys())))) 112 113 # l=[ 114 # (5,'e'), 115 # (1,'b'), 116 # (3,'a'), 117 # (4,'d'), 118 # ] 119 # l1=['a10','b12','c10',100] #不同类型之间不能进行比较 120 l1=['a10','a2','a10'] #不同类型之间不能进行比较 121 # print(list(max(l1))) 122 # print('--->',list(max(l1))) 123 124 125 126 # l=[1,3,100,-1,2] 127 # print(max(l)) 128 dic={'age1':18,'age2':10} 129 # print(max(dic)) #比较的是key 130 # print(max(dic.values())) #比较的是key，但是不知道是那个key对应的 131 132 # print(max(zip(dic.values(),dic.keys()))) #结合zip使用 133 # 134 # 135 people=[ 136 {'name':'alex','age':1000}, 137 {'name':'wupei','age':10000}, 138 {'name':'yuanhao','age':9000}, 139 {'name':'linhaifeng','age':18}, 140 ] 141 # max(people,key=lambda dic:dic['age']) 142 # print('周绍陈取出来没有',max(people,key=lambda dic:dic['age'])) 143 144 # ret=[] 145 # for item in people: 146 # ret.append(item['age']) 147 # print(ret) 148 # max(ret) 149 150 151 # print(chr(97)) 152 # print(ord('a')) 153 154 # print(pow(3,3)) #3**3 155 # print(pow(3,3,2)) #3**3%2 156 157 158 159 # l=[1,2,3,4] 160 # print(list(reversed(l))) 161 # print(l) 162 163 # 164 # print(round(3.5)) 165 166 # print(set('hello')) 167 168 # l='hello' 169 # s1=slice(3,5) 170 # s2=slice(1,4,2) 171 # print(l[3:5]) 172 # print(l[s1]) 173 # print(l[s2]) 174 # print(s2.start) 175 # print(s2.stop) 176 # print(s2.step) 177 178 179 180 l=[3,2,1,5,7] 181 l1=[3,2,'a',1,5,7] 182 # print(sorted(l)) 183 # 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 184 # people=[ 185 # {'name':'alex','age':1000}, 186 # {'name':'wupei','age':10000}, 187 # {'name':'yuanhao','age':9000}, 188 # {'name':'linhaifeng','age':18}, 189 # ] 190 # print(sorted(people,key=lambda dic:dic['age'])) 191 name_dic={ 192 'abyuanhao': 11900, 193 'alex':1200, 194 'wupei':300, 195 } 196 print(sorted(name_dic)) 197 # 198 # print(sorted(name_dic,key=lambda key:name_dic[key])) 199 # 200 # print(sorted(zip(name_dic.values(),name_dic.keys()))) 201 202 # print(str('1')) 203 # print(type(str({'a':1}))) 204 # dic_str=str({'a':1}) 205 # print(type(eval(dic_str))) 206 207 # l=[1,2,3,4] 208 # print(sum(l)) 209 # print(sum(range(5))) 210 # 211 # 212 # print(type(1)) 213 # 214 # msg='123' 215 # 216 # if type(msg) is str: 217 # msg=int(msg) 218 # res=msg+1 219 # print(res) 220 221 # def test(): 222 # msg='撒旦法阿萨德防撒旦浪费艾丝凡阿斯蒂芬' 223 # print(locals()) 224 # print(vars()) 225 # test() 226 # print(vars(int)) 227 228 #import------>sys----->__import__() 229 # import test 230 # test.say_hi() 231 232 # import 'test'#报错 233 module_name='test' 234 m=__import__(module_name) 235 m.say_hi()
2.文件处理读操作
1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 # f=open('陈粒',encoding='utf-8') 4 # data=f.read() 5 # print(data) 6 # f.close() 7 # 8 # f=open('xxx') 9 # data=f.read() 10 # print(data) 11 12 #r w a 13 f=open('陈粒','r',encoding='utf-8') 14 # data=f.read() 15 # print(data) 16 # print(f.readable()) 17 # print('第1行',f.readline(),end='') 18 # print('第2行',f.readline()) 19 # print('第3行',f.readline()) 20 # # for i in range(1): 21 # # pass 22 # print('第4行',f.readline()) 23 # print('第5行',f.readline()) 24 # print('第6行',f.readline()) 25 # print('第7行',f.readline()) 26 27 data=f.readlines() 28 print(data) 29 f.close()
3.文件处理写操作 不追加
1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 f=open('陈粒','w',encoding='utf8') 4 # f.read() 5 f.write('11111111\n') 6 f.write('222222222\n') 7 f.write('333\n4444\n555\n') 8 # f.writable() 9 # f.writelines(['555\n','6666\n']) 10 # f.writelines(['555\n','6666\n',1]) # 文件内容只能是字符串，只能写字符串 11 f.close()
4.文件处理写操作 追加
1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 f=open('陈粒','a',encoding='utf-8') 4 f.write('写到文件最后')
5.文件处理其他模式
1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 # f=open('陈粒','r+',encoding='utf-8') 4 # data=f.read() 5 # print(data) 6 # f.write('123sb') 7 # 8 # 9 # 10 # f.write('sb') 11 12 13 #文件修改 14 # src_f=open('陈粒','r',encoding='utf-8') 15 # data=src_f.readlines() 16 # src_f.close() 17 # # 18 # for i in data: 19 # print(i) 20 # print(data) 21 # dst_f=open('陈粒','w',encoding='utf-8') 22 # data=dst_f.readlines() 23 # dst_f.writelines(data) 24 # dst_f.write(data[0]) 25 # dst_f.close() 26 27 # with open('陈粒.txt','w') as f: 28 # f.write('1111\n') 29 30 31 # src_f=open('陈粒.txt','r',encoding='utf-8') 32 # dst_f=open('混吧','w',encoding='utf-8') 33 # with open('陈粒.txt','r',encoding='utf-8') as src_f,\ 34 # open('混吧','w',encoding='utf-8') as dst_f: 35 # data=src_f.read() 36 # dst_f.write(data) 37 38 # f=open('陈粒.txt') 39 # print(f.encoding) #查看文件编码
