On 4 Oct 2006 06:09:21 -0700, [EMAIL PROTECTED]
<[EMAIL PROTECTED]> wrote:
> Hi guys,
> this is my first post. my "programming" background is perlish scripting
> and now I am learning python. I need to create a dictionary of list
> from a file. Normally in perl I use
> -Original Message-
> From:
> [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]
> rg] On Behalf Of Giovanni Bajo
> Sent: 04 October 2006 15:17
> To: python-list@python.org
> Subject: Re: dictionary of list from a file
>
> [EMAIL PROTECTED] wrote:
>
> -> > Python 2.5 introduced a dictionary type with automatic
> > creation of values,
> > ala Perl:
> >
> > ===
> > from collections import defaultdict
> >
> > d = defaultdict(list)
> > for line in fl:
> > k, v = line.strip().split()
> > d[k].append(v
Peter Otten wrote:
> [EMAIL PROTECTED] wrote:
>
> > for line in (l.rstrip("\n") for l in file("test.txt", "rU") if l[0] !=
> > "\n"):
> > \001\001\001k,\001v\001=\001line.split()
> > \001\001\001d.setdefault(k,\001[]).append(v)
>
> Note that this snippet will produce the same output with or without
[EMAIL PROTECTED] wrote:
> for line in (l.rstrip("\n") for l in file("test.txt", "rU") if l[0] !=
> "\n"):
> k, v = line.split()
> d.setdefault(k, []).append(v)
Note that this snippet will produce the same output with or without the
rstrip() method call.
Peter
--
http://mail.python.org/ma
limodou wrote:
> On 4 Oct 2006 13:11:15 -0700, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> > limodou wrote:
> > > here is my program
> > >
> > > d = {}
> > > for line in file('test.txt'):
> > > line = line.strip()
> > > if line:
> > > k, v = line.strip().split()
> > > d.s
[EMAIL PROTECTED] wrote:
> d = {}
> for line in [l[:-1] for l in file('test.txt', 'rU') if len(l)>1]:
> k,v = line.split()
> d.setdefault(k,[]).append(v)
Try that with a test.txt where the last line has no newline.
Peter
--
http://mail.python.org/mailman/listinfo/python-list
On 4 Oct 2006 13:11:15 -0700, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> limodou wrote:
> > here is my program
> >
> > d = {}
> > for line in file('test.txt'):
> > line = line.strip()
> > if line:
> > k, v = line.strip().split()
> > d.setdefault(k, []).append(v)
> > prin
Thus spoke Paul McGuire (on 2006-10-04 17:34):
> <[EMAIL PROTECTED]> wrote in message
>> this is my first post. my "programming" background is perlish
> I'll see your perlish line noise, and raise you this obfuscapython: :)
>
> data = """\
> 2 1 2 3 4
> 7 7 8 9 10
> 5 1 3 5 7 9
> 2 6 8 10""".s
limodou wrote:
> here is my program
>
> d = {}
> for line in file('test.txt'):
> line = line.strip()
> if line:
> k, v = line.strip().split()
> d.setdefault(k, []).append(v)
> print d
Minor nits: you call strip twice, when you don't need to. just omit
the second call.
Also
<[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> Hi guys,
> this is my first post. my "programming" background is perlish scripting
> and now I am learning python. I need to create a dictionary of list
> from a file. Normally in perl I use to do like:
&
[EMAIL PROTECTED] wrote:
> while(){
> @info=split(/ +/,$_);
> push (@{$tmp{$info[0]}},$info[1]);
> }
>
> and then
> foreach $key (keys %tmp){
>print "$key -> @{$tmp{$key}}\n";
> }
Python 2.5 introduced a dictionary type with automatic creation of values,
ala Perl:
On Wed, 04 Oct 2006 06:09:21 -0700, [EMAIL PROTECTED] let this
slip:
> b={}
> a=[]
> for line in fl.readlines():
> info=lines.split()
> b[info[0]] = a.append(info[1])
append does not return a value. you'll want something like
d = {}
for line in fl:
key, value = line.strip
[EMAIL PROTECTED] wrote:
> in python I tried:
> b={}
> a=[]
> for line in fl.readlines():
> info=lines.split()
> b[info[0]] = a.append(info[1])
>
> and then
> for i in b:
> print i,b[i]
> i get
> 2 None
> 7 None
>
> data file is:
> 2 1
> 2 2
> 2 3
> 2 4
> 7 7
> 7 8
> 7 9
> 7
On 4 Oct 2006 06:09:21 -0700, [EMAIL PROTECTED]
<[EMAIL PROTECTED]> wrote:
> Hi guys,
> this is my first post. my "programming" background is perlish scripting
> and now I am learning python. I need to create a dictionary of list
> from a file. Normally in perl
Hi guys,
this is my first post. my "programming" background is perlish scripting
and now I am learning python. I need to create a dictionary of list
from a file. Normally in perl I use to do like:
while(){
@info=split(/ +/,$_);
push (@{$tmp{$info[0]}},$info[1]);
}
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