[Reference] From Perl 5 to Perl 6.
Good article for Perl programmer from 5 to 6. http://perlgeek.de/en/article/5-to-6 Wi sh this helps. regards, Stanley Huang
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Showing posts from December, 2010
[Level 1] Python int array join.
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When you have a int array and you want to concatenate them into a string. You might use this syntax, and python return you the TypeError. >>> a=[1,2,3] >>> print ' '.join(a) Traceback (most recent call last): File " ", line 1, in ? TypeError: sequence item 0: expected string, int found How could we solve this problem? 1. Use a generator expression: >>> print ' '.join(str(i) for i in a) 1 2 3 >>> 2. Use imap method from itertools >>> from itertools import imap >>> print ' '.join(imap(str, a)) 1 2 3 >>> Wish this helps. regards, Stanley Huang
[Level 3] Recovering an Innodb table from only an .ibd file.
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[Level 3] Use cmd module to create python cli program.
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How to use cmd module to create python cli program? Please refer to the following sample: $ cat ./cli.py #!/usr/bin/python import os, sys from menu.CLI_main import CLI_main ###################################### main if __name__ == '__main__': cli=main("user","host") cli.cmdloop() $ $ cat ./main.py import cmd class main(cmd.Cmd): def __init__(self, user, host): cmd.Cmd.__init__(self) self.user = user self.host = host self.prompt = "%s@%s:%s> " % (user, host, "main") def do_system(self, args): from system import system sub_cmd = system(self.user, host) sub_cmd.cmdloop() def help...
[Level 2] Refactoring your single python file program into module files.
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How to refactory your single pyhon file with multi module files? 1. create folder for modules. 2. create empty __init__.py in the folder. 3. move partial your code into the new folder. 4. add import syntax into your main program. 5. test it. 6. done. e.g. Before refactoring: $ cat ./t.py #!/usr/bin/python class a(): def a(self): print "call a()" class b(): def b(self): print "call b()" if __name__ == '__main__': c=a() c.a() d=b() d.b() After refactoring: $ ls -al total 8 drwxr-xr-x 5 root root 170 Dec 20 23:14 . drwxrwxrwt 16 root root 544 Dec 20 23:17 .. drwxr-xr-x 6 root root 204 Dec 20 23:13 a drwxr-xr-x 6 root root 204 Dec 20 23:13 b -rwxr--r-- 1 root root 119 Dec 20 23:14 t.py $ $ ls a __init__.py __init__.pyc a.py...