Is there a clean way to check if a given user exists on a computer through python?
Currently I am using pwd.getpwall(), which shows me the entire password database. But I just want the users accounts of the computer. And with using getpwall() I am unable to do this ...
if 'fo开发者_开发百科o' in pwd.getpwall():
do stuff
since pwd.getpwall() returns a list of objects. And if I wanted to check if a user exist I would have to do a loop. I assume there is an easier way to do this.
In the same page of the manual:
pwd.getpwnam(name)
Return the password database entry for the given user name.
This is the result for an existent and an inexistent user:
>>> import pwd
>>> pwd.getpwnam('root')
pwd.struct_passwd(pw_name='root', pw_passwd='*', pw_uid=0, pw_gid=0, pw_gecos='System Administrator', pw_dir='/var/root', pw_shell='/bin/sh')
>>> pwd.getpwnam('invaliduser')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
KeyError: 'getpwnam(): name not found: invaliduser'
Therefore you can do:
try:
pwd.getpwnam(name)
except KeyError:
# Handle non existent user
pass
else:
# Handle existing user
pass
Note: the in
operator would do a loop anyways to check if a given item is in a list (ref).
pwd.getpwnam
raises a KeyError
if the user does not exist:
def getuser(name):
try:
return pwd.getpwnam(name)
except KeyError:
return None
You could use something like:
>>> [x.pw_name for x in pwd.getpwall()]
Store the list and just check for username in list
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