由于 Python 在 2-3 版本的升级过程中的激进演变，导致了应用的兼容困难， 很多第三方库为了同时兼容 Python 2 和 3 不得不使用一些难看的 patch 来解决兼容性问题。 比较常见的做法是自己编写 _compat.py（compatibility 兼容性的缩写） 或者直接使用 six 库。
six 支持 Python 2.5+ 版本，你可以引用它，也可以将其直接复制到代码库中。
six 是 23 的意思，之所以使用 23 而不是 2+3 ，是因为 five 这个名字已经被 Zope Five 所使用。
官方文档：six
| class View: | |
| """ | |
| Intentionally simple parent class for all views. Only implements | |
| dispatch-by-method and simple sanity checking. | |
| """ | |
| http_method_names = ['get', 'post', 'put', 'patch', 'delete', 'head', 'options', 'trace'] | |
| def __init__(self, **kwargs): | |
| """ |
| from django.http import QueryDict | |
| from django.http.multipartparser import MultiValueDict | |
| class RESTMiddleware(object): | |
| def process_request(self,request): | |
| request.PUT=QueryDict('') | |
| request.DELETE = QueryDict('') | |
| method = request.META.get('REQUEST_METHOD','').upper() #upper ? rly? | |
| if method == 'PUT': | |
| self.handle_PUT(request) |
| """Generate cryptographically strong pseudo-random numbers suitable for | |
| managing secrets such as account authentication, tokens, and similar. | |
| See PEP 506 for more information. | |
| https://www.python.org/dev/peps/pep-0506/ | |
| """ | |
| __all__ = ['choice', 'randbelow', 'randbits', 'SystemRandom', | |
| 'token_bytes', 'token_hex', 'token_urlsafe', |
| class MySQLCursor: | |
| """创建一个游标类""" | |
| def __init__(self,cursor,logger): | |
| self.cursor=cursor | |
| self.logger=logger | |
| def execute(self,sql,params=None): | |
| self.logger.info(sql+str(params)) | |
| self.cursor.execute(sql, params) |
| class OracleCursor: | |
| """游标类""" | |
| def __init__(self, cursor, logger, dict_result): | |
| self.cursor = cursor | |
| self.logger = logger | |
| self.dict_result = dict_result | |
| def _dict_result(self, cursor): | |
| cols = [d[0].lower() for d in cursor.description] |
| # !/usr/bin/python3 | |
| # coding=utf-8 | |
| # Time: O(n*logn) | |
| # Space: O(n) | |
| # 合并 | |
| def merge(l1, l2): | |
| index1 = index2 = 0 | |
| r = [] |
| # !/usr/bin/python3 | |
| # coding=utf-8 | |
| # Time: O(n*logn) | |
| # Space: O(n) | |
| def qsort(arr): | |
| # 基线条件 | |
| if len(arr) < 2: | |
| return arr |
| # coding:utf-8 | |
| import socket | |
| EOL1 = "\n\n" | |
| EOL2 = "\n\r\n" | |
| body = """Hello World! <h1> Simple socket server</h1>""" | |
| response_params = [ | |
| 'HTTP/1.0 200 OK', |
| from collections import OrderedDict | |
| od = OrderedDict(zip('foo', 'bar')) | |
| # 方法1 | |
| od.keys()[-1] # 仅适用于2 | |
| od.values()[-1] | |
| od.items()[-1] | |
| list(od.items())[-1] # 兼容 3.x |
