Python Get Password
I just discovered the getpass class in Python (see ). And again I am falling in love - the saying that Python comes with batteries included is indeed true.
This silly test-program gets a password twice and compares the results, if there is a match the password is printed on screen. If there is a mismatch the user is informed of this (and the passwords are displayed).
GetPass comes with two functions of particular interest: getpass and getuser. By looking a bit under the hood we find more that that (to find out what it means is left as an excercise [:)]-|--< ):
>python Python 2.5.1 (r251:54863, May 2 2007, 16:56:35) [GCC 4.1.2 (Ubuntu 4.1.2-0ubuntu4)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import getpass >>> dir(getpass) [<snip>, 'default_getpass', 'getpass', 'getuser', <snip>, 'unix_getpass', 'win_getpass'] >>> getpass.unix_getpass() Password: 'foo' >>> getpass.win_getpass() Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/lib/python2.5/getpass.py", line 50, in win_getpass import msvcrt ImportError: No module named msvcrt >>> getpass.default_getpass() Warning: Problem with getpass. Passwords may be echoed. Password: foobar 'foobar'
Example of a small program
This little program illustrates the method getpass (that is similar to raw_input but it does not echo the keypunches) and the method getuser (that gets the login name).
import getpass print "WARNING: do not provide a real password!" print "%s, enter your " % getpass.getuser(), pw1 = getpass.getpass() print "Confirm ", pw2 = getpass.getpass() if pw1 == pw2: print 'Your password was "%s".' % pw1 else: print 'BAD: you provided different passwords "%s" and "%s".' % (pw1, pw2)
Example of Usage
First we provide the same password twice:
>python get_password.py WARNING: do not provide a real password! per, enter your Password: Confirm Password: Your password was "fnord".
And now we provide different passwords:
>python get_password.py WARNING: do not provide a real password! per, enter your Password: Confirm Password: BAD: you provided different passwords "xyzzy" and "LiBeBCNOFNe".
No more need to pass the password in as a command line argument or implement an ugly hacked version of raw_input - thank god (no: thank Guido!).
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