abc

commons-codec包可以从apache下载，最新版是1.3 不可逆算法 1.MD5 String str = "abc"; DigestUtils.md5Hex(str); 附.net生成MD5的方法，生成内容跟java一致： String str = "abc" ; FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5"); 2.SHA1 String str = "abc"; DigestUtils.shaHex(str); 附.net生成SHA1的方式，生成内容跟java一致： String str = "abc" ; FormsAuthentication.HashPasswordForStoringInConfigFile(str, "SHA1"); 可逆算法 常规加密解密算法：BASE64 加密 String str= "abc"; // abc为要加密的字符串 byte[] b = Base64.encodeBase64(str.getBytes(), true); System.out.println(new String(b)); 解密 String str = "YWJj"; // YWJj为要解密的字符串 byte[] b = Base64.decodeBase64(str

# 元字符+，*遇到？后就会变为贪婪匹配 print(re.findall('abc+?','abcccccc')) #['abc'] print(re.findall('abc*?','abcccccc')) #['ab'] print(re.findall('abc{1,4}','abcccabc')) #['abccc', 'abc'] print(re.findall('abc{1,4}?','abcccabc')) #['abcc', 'abc'] #--------------------------------------------------------------------- #元字符之字符集［］ print(re.findall("[abc]","sdfgbahjkkk")) #若是字符集的前后没有字母，就会分别匹配a,b,c ['b', 'a'],否在就字符集里选择一个字母和外面的连接使用 print(re.findall("a[a-z]","fwefaefewaasfwe")) #['ae', 'aa'] print(re.findall("a[.*+]","a.b*c+")) #在字符集里的符号就是普通符号 ['a.'] print(re.findall("[^ab]","fgddab")) #['f', 'g', 'd', 'd'] print(re

zxq547 python定义接口继承类invalid syntax解决办法 1 2 3 4 5 6 7 class s_all(metaclass = abc.ABCMeta): #python2.7用此方法定义接口继承 # __metaclass__ = abc.ABCMeta @abc .abstractmethod def read( self ): pass pyhton2.7会报错，此方法用于python3+pyhton2.7应用次方法定义 1 2 3 4 5 6 7 class s_all(): #python2.7用此方法定义接口继承 __metaclass__ = abc.ABCMeta @abc .abstractmethod def read( self ): pass 　　 1 2 3 4 5 6 7 class s_all(metaclass = abc.ABCMeta): #python2.7用此方法定义接口继承 # __metaclass__ = abc.ABCMeta @abc .abstractmethod def read( self ): pass pyhton2.7会报错，此方法用于python3+pyhton2.7应用次方法定义 1 2 3 4 5 6 7 class s_all(): #python2.7用此方法定义接口继承 _

I recently discovered abstract base classes (ABCs) in collections and like their clear, systematic approach and Mixins. Now I also want to create customs strings (*), but I couldn't find an ABC for strings. There is UserString, but UserDict was discouraged!? Deriving from str itself would have no Mixins? How would you access the "data" part of the string in overridden methods? Somewhere I saw the suggestions to derive from Sequence and Hashable, but then I couldn't write if 'test' in my_string: ?! Which approach do you recommend? (*) The reasons are: - write strings that order in an internally

Extending both an abstract base class and a class derived from "object" works as you would expect: if you you haven't implemented all abstract methods and properties, you get an error. Strangely, replacing the object-derived class with an class that extends "Exception" allows you to create instances of classes which do not implement all the required abstract methods and properties. For example: import abc # The superclasses class myABC( object ): __metaclass__ = abc.ABCMeta @abc.abstractproperty def foo(self): pass class myCustomException( Exception ): pass class myObjectDerivedClass( object )