1 #__author: Administrator
2 #date: 2016/9/23
3 """
4 class Foo:
5
6 def __init__(self, name, age):
7 self.name = name
8 # self.age = age
9 self.__age = age # 私有，外部无法直接访问
10
11 def show(self):
12 return self.__age
13
14
15 obj = Foo('alex', 19)
16 print(obj.name)
17 # obj.age
18 # print(obj.__age)
19 ret = obj.show()
20 print(ret)
21 """
22
23 """
24 class Foo:
25 __v = '123'
26
27 def __init__(self):
28 pass
29 def show(self):
30 return Foo.__v
31 @staticmethod
32 def stat():
33 return Foo.__v
34 # print(Foo.__v)
35 # ret = Foo().show()
36 # print(ret)
37
38 ret = Foo.stat()
39 print(ret)
40 """
41 """
42 class Foo:
43 def __f1(self):
44 return 123
45
46 def f2(self):
47 r = self.__f1()
48 return r
49
50 obj = Foo()
51 ret = obj.f2()
52 print(ret)
53 """
54
55 """
56 class F:
57 def __init__(self):
58 self.ge = 123
59 self.__gene = 123
60
61 class S(F):
62 def __init__(self,name):
63 self.name = name
64 self.__age = 18
65 super(S, self).__init__()
66
67 def show(self):
68 print(self.name)
69 print(self.__age)
70 print(self.ge)
71 print(self.__gene)
72
73 s = S('alex')
74 s.show()
75 """
76
77 """
78 class Foo:
79 def __init__(self):
80 print('init')
81
82 def __call__(self, *args, **kwargs):
83 print('call')
84
85 # obj = Foo()
86 # obj()
87 Foo()()
88 """
89 # s = "123"
90 # # s = str('123')
91 #
92 # i = int(s)
93 # print(i,type(i))
94
95 """
96 class Foo:
97
98 def __init__(self):
99 pass
100
101 def __int__(self):
102 return 1111
103
104 def __str__(self):
105 return 'alex'
106
107 obj = Foo()
108 print(obj, type(obj))
109
110 # int,对象，自动执行对象的 __int__方法，并将返回值赋值给int对象
111 r = int(obj)
112 print(r)
113 i = str(obj)
114 print(i)
115
116 """
117 """
118 class Foo:
119
120 def __init__(self,n,a):
121 self.name =n
122 self.age =a
123
124 def __str__(self):
125 return '%s-%s' %(self.name,self.age,)
126
127 obj = Foo('alex', 18)
128 print(obj) #print(str(obj)) str(obj) obj中__str__，并获取其返回值
129 """
130 """
131 class Foo:
132
133 def __init__(self, name,age):
134 self.name = name
135 self.age = age
136
137 def __add__(self, other):
138 # self = obj1 (alex,19)
139 # other = obj2(eric,66)
140 # return self.age + other.age
141 #return Foo('tt',99)
142 return Foo(obj1.name, other.age)
143
144 def __del__(self):
145 print('析构方法') # 对象被销毁（）时，自动执行
146
147 obj1 = Foo('alex', 19)
148 obj2 = Foo('eirc', 66)
149
150 r = obj1 + obj2
151 # 两个对象相加时，自动执行第一个对象的的 __add__方法，并且将第二个对象当作参数传递进入
152 print(r,type(r))
153 """
154
155
156 """
157 class Foo:
158 def __init__(self, name,age):
159 self.name = name
160 self.age = age
161 self.n = 123
162
163 # obj = Foo('alex', 18)
164 #
165 # d = obj.__dict__
166 # print(d)
167
168 # ret = Foo.__dict__
169 # print(ret)
170 """
171
172 # li = [11,22,33,44]
173 # li = list([11,22,33,44])
174 #
175 # li[3]
176 # #
177 #
178 # li[3] = 666
179 #
180 # del li[2]
181
182 """
183 class Foo:
184
185 def __init__(self, name,age):
186 self.name = name
187 self.age = age
188
189 def __getitem__(self, item):
190 return item+10
191
192 def __setitem__(self, key, value):
193 print(key,value)
194
195 def __delitem__(self, key):
196 print(key)
197 li = Foo('alex', 18)
198 r= li[8] # 自动执行li对象的类中的 __getitem__方法，8当作参数传递给item
199 print(r)
200
201 li[100] = "asdf"
202
203 del li[999]
204 """
205 """
206 class Foo:
207
208 def __init__(self, name,age):
209 self.name = name
210 self.age = age
211
212 def __getitem__(self, item):
213 # return item+10
214 # 如果item是基本类型：int，str，索引获取
215 # slice对象的话，切片
216 if type(item) == slice:
217 print('调用这希望内部做切片处理')
218 else:
219 print(item.start)
220 print(item.stop)
221 print(item.step)
222 print('调用这希望内部做索引处理')
223
224 def __setitem__(self, key, value):
225 print(key,value)
226
227 def __delitem__(self, key):
228 print(key)
229
230 li = Foo('alex', 18)
231 li[123]
232 li[1:4:2]
233
234 li[1:3] = [11,22]
235
236 del li[1:3]
237
238 # class Slice:
239 # def __init__(self,a,b,c):
240 # self.start = a
241 # self.end = b
242 # self.step = c
243 # obj = Slice(1,4,2)
244 # li[999] = "alex"
245 #
246 # del li[234]
247 """
248 """
249 class Foo:
250
251 def __init__(self, name,age):
252 self.name = name
253 self.age = age
254
255 def __iter__(self):
256 return iter([11,22,33])
257 li = Foo('alex', 18)
258 # 如果类中有 __iter__ 方法，对象=》可迭代对象
259 # 对象.__iter__() 的返回值： 迭代器
260 # for 循环，迭代器，next
261 # for 循环，可迭代对象，对象.__iter__()，迭代器，next
262 # 1、执行li对象的类F类中的 __iter__方法，并获取其返回值
263 # 2、循环上一步中返回的对象
264 for i in li:
265 print(i)
266 """
267 # li = [11,22,33,44]
268 # li= list([11,22,33,44])
269 # for item in li:
270 # print(item)
271
272 """
273 class MyType(type):
274 def __init__(self,*args, **kwargs):
275 # self=Foo
276 print(123)
277 pass
278
279 def __call__(self, *args, **kwargs):
280 # self=Foo
281 r = self.__new__()
282
283
284 #
285
286 class Foo(object,metaclass=MyType):
287 def __init__(self):
288 pass
289
290 def __new__(cls, *args, **kwargs):
291 return '对象'
292
293 def func(self):
294 print('hello wupeiqi')
295
296 obj = Foo()
297
298
299
300
301
302 class Bar:
303 def __init__(self):
304 print(123)
305
306
307 obj = Bar()
308 """
309
310 """
311 while True:
312 try:
313 # 代码块，逻辑
314 inp = input('请输入序号：')
315 i = int(inp)
316 except Exception as e:
317 # e是Exception对象，对象中封装了错误信息
318 # 上述代码块如果出错，自动执行当前块的内容
319 print(e)
320 i = 1
321 print(i)
322 """
323 #li = [11,22]
324 #li[999] # IndexError
325 # int('qwe') # ValueError
326 """
327 def fun():
328 ret = 0
329 try:
330 li = [11, 22]
331 li[1]
332 int('w3r')
333
334 except IndexError as e:
335 print('IndexError',e)
336 except ValueError as e:
337 print('ValueError',e)
338 except Exception as e:
339 print('Exception',e)
340 else:
341 ret = 1
342 print('elese')
343 finally:
344 print('....')
345
346 return ret
347 r = fun()
348 if r == 0:
349 print('500')
350 else:
351 pass
352
353 """
354 """
355 class F:
356 def __init__(self):
357 self.__a = 132
358
359 def show(self):
360 # print(self.__a)
361 return self.__a
362
363 class S(F):
364 def __init__(self):
365 self.name = 123
366 super(S, self).__init__()
367
368 obj = S()
369 r = obj.show()
370 print(r)
371 """
372 """
373 try:
374 # int('asdf')
375 # 主动出发异常
376 # raise Exception('不过了...')
377 except Exception as e:
378 print(e)
379
380 def db():
381 # return True
382 return False
383
384 def index():
385 try:
386 r = input(">>")
387 int(r)
388
389
390 result = db()
391 if not result:
392 r = open('log','a')
393 r.write('数据库处理错误')
394 # 打开文件，写日志
395 #raise Exception('数据库处理错误')
396 except Exception as e:
397 str_error = str(e)
398 print(str_error)
399 r = open('log', 'a')
400 r.write(str_error)
401 # 打开文件，写日志
402
403 index()
404 """
405
406
407 """
408 class OldBoyError(Exception):
409
410 def __init__(self, msg):
411 self.message = msg
412
413 def __str__(self):
414 return self.message
415
416 # obj = OldBoyError('xxx')
417 # print(obj)
418 try:
419 raise OldBoyError('我错了...')
420 except OldBoyError as e:
421 print(e)# e对象的__str__()方法，获取返回
422
423 """
424
425 # assert 条件,断言，用于强制用户服从，不服从就报错，可补货，一般不补货
426 # print(23)
427 # assert 1==2
428 # print(456)
429
430
431 """
432 class Foo:
433 def __init__(self, name,age):
434 self.name = name
435 self.age = age
436
437 def show(self):
438 return "%s-%s " %(self.name,self.age)
439 def __int__(self):
440 return 123
441 def __str__(self):
442 return 'uuu'
443 obj = Foo('alex', 18)
444
445 r = int(obj) # r = 123
446 u = str(obj)
447 b = 'name'
448 """
449
450
451 # getattr
452 # hasattr
453 # setattr
454 # delattr
455 # 通过字符串的形式操作对象中的成员
456
457 # func = getattr(obj, 'show')
458 # print(func)
459 # r = func()
460 # print(r)
461
462 # print(hasattr(obj, 'name'))
463 # obj.k1
464 # setattr(obj, 'k1', 'v1')
465 # print(obj.k1)
466 # obj.name
467 # delattr(obj, 'name')
468 # obj.name
469
470 # 去什么东西里面获取什么内容
471 # inp = input('>>>')
472 # v = getattr(obj, inp)
473 # print(v)
474
475
476
477 """
478 obj.name
479 b = "name"
480 obj.b # obj.name
481 """
482 # b = "name"
483 # obj.__dict__['name']
484 # obj.__dict__[b]
485
486 # if b == 'name':
487 # obj.name
488
489
490 """
491 class Foo:
492
493 stat = '123'
494
495 def __init__(self, name,age):
496 self.name = name
497 self.age = age
498
499 # 通过字符串的形式操作对象中的成员
500 r = getattr(Foo, 'stat')
501 print(r)
502 """
503
504 """
505 import s2
506
507
508 # r1 = s2.NAME
509 # print(r1)
510 # r2 = s2.func()
511 # print(r2)
512
513 r1 = getattr(s2, 'NAME')
514 print(r1)
515
516 r2 = getattr(s2, 'func')
517 result = r2()
518 print(result)
519
520 cls = getattr(s2, 'Foo')
521 print(cls)
522 obj = cls()
523 print(obj)
524 print(obj.name)
525 """
526 """
527 import s2
528 inp = input('请输入要查看的URL：')
529 if hasattr(s2, inp):
530 func = getattr(s2, inp)
531 result = func()
532 print(result)
533 else:
534 print('404')
535 """
536
537 # class Foo:
538 # def __init__(self, name,age):
539 # self.name = name
540 # self.age = age
541
542 # obj = Foo() # obj对象，obj也成为Foo类的 实例，（实例化）
543 # obj1 = Foo()
544 # obj2 = Foo()
545 # obj3 = Foo()
546
547 # 单例，用于使用同一份实例（对象）
548 """
549 class Foo:
550 def __init__(self, name,age):
551 self.name = name
552 self.age = age
553
554 def show(self):
555 print(self.name,self.age)
556
557 v = None
558
559 while True:
560 if v:
561 v.show()
562 else:
563 v = Foo('alex', 123)
564 v.show()
565 """
566 class Foo:
567
568 __v = None
569
570 @classmethod
571 def get_instance(cls):
572 if cls.__v:
573 return cls.__v
574 else:
575 cls.__v = Foo()
576 return cls.__v
577
578 # 不要在使用 类()
579 obj1 = Foo.get_instance()
580 print(obj1)
581 obj2 = Foo.get_instance()
582 print(obj2)
583 obj3 = Foo.get_instance()
584 print(obj3)
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