On 2022-06-08 at 08:07:40 -0000,
De ongekruisigde <ongekruisi...@news.eternal-september.org> wrote:
> Depending on the problem a regular expression may be the much simpler
> solution. I love them for e.g. text parsing and use them all the time.
> Unrivaled when e.g. parts of text have to be extracted, e.g. from lines
> like these:
>
> root:x:0:0:System administrator:/root:/run/current-system/sw/bin/bash
> dhcpcd:x:995:991::/var/empty:/run/current-system/sw/bin/nologin
> nm-iodine:x:996:57::/var/empty:/run/current-system/sw/bin/nologin
> avahi:x:997:996:avahi-daemon privilege separation
> user:/var/empty:/run/current-system/sw/bin/nologin
> sshd:x:998:993:SSH privilege separation
> user:/var/empty:/run/current-system/sw/bin/nologin
> geoclue:x:999:998:Geoinformation
> service:/var/lib/geoclue:/run/current-system/sw/bin/nologin
>
> Compare a regexp solution like this:
>
> >>> g = re.search(r'([^:]*):([^:]*):(\d+):(\d+):([^:]*):([^:]*):(.*)$' , s)
> >>> print(g.groups())
> ('geoclue', 'x', '999', '998', 'Geoinformation service',
> '/var/lib/geoclue', '/run/current-system/sw/bin/nologin')
>
> to the code one would require to process it manually, with all the edge
> cases. The regexp surely reads much simpler (?).
Uh...
>>> import pwd # https://docs.python.org/3/library/pwd.html
>>> [x for x in pwd.getpwall() if x[0] == 'geoclue']
[pwd.struct_passwd(pw_name='geoclue', pw_passwd='x', pw_uid=992,
pw_gid=992, pw_gecos='Geoinformation service', pw_dir='/var/lib/geoclue',
pw_shell='/sbin/nologin')]
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