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