List search

[Kevin Walzer]

I'm having a problem with searching a list. Here's my code:

mylist = ['x11', 'x11-wm', 'x11-system']

for line in mylist:
if 'x11' in line:
print line

This results in the following output:

x11
x11-wm
x11-system

I'm looking to return the list item that just has 'x11'. How can I
structure my search term so that this output is returned?

[Stefan Bellon]

On Fri, 28 Sep, Kevin Walzer wrote:

I'm having a problem with searching a list. Here's my code:

mylist = ['x11', 'x11-wm', 'x11-system']

for line in mylist:
if 'x11' in line:
print line

Just compare for equality:

if line == 'x11':

or

print "\n".join(x for x in mylist if x == 'x11')

--
Stefan Bellon

[Robert Kern]

Kevin Walzer wrote:

I'm having a problem with searching a list. Here's my code:

mylist = ['x11', 'x11-wm', 'x11-system']

for line in mylist:
if 'x11' in line:
print line

This results in the following output:

x11
x11-wm
x11-system

I'm looking to return the list item that just has 'x11'. How can I
structure my search term so that this output is returned?

line == 'x11'

--
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco

[Tim Williams]

On 28/09/2007, Kevin Walzer <[e-mail]:

I'm having a problem with searching a list. Here's my code:

mylist = ['x11', 'x11-wm', 'x11-system']

for line in mylist:
if 'x11' in line:
print line

This results in the following output:

x11
x11-wm
x11-system

That output is correct, you are asking your script to print any list
item containing x11 when what you actually wanted was a list item that
is the string 'x11'

mylist = ['x11', 'x11-wm', 'x11-system']
for item in mylist:
if item == 'x11':
print line

If there is only ever one 'x11' in the list you could also consider

print mylist.index('x11')

and

print mylist[mylist.index('x11')]

Also, before iterating the whole list check that 'x11' exists

if 'x11' in mylist:
do stuff

and list comprehesions

print [x for x in mylist if x == 'x11']

HTH :)

Tim Williams

[Kevin Walzer]

Robert Kern wrote:

line == 'x11'

D'oh! That was simple, wasn't it? *smacks head*

That did the trick. Thanks!

--
Kevin Walzer
Code by Kevin
http://www.codebykevin.com

[Bjoern Schliessmann]

Kevin Walzer wrote:

I'm having a problem with searching a list. Here's my code:

mylist = ['x11', 'x11-wm', 'x11-system']

for line in mylist:
if 'x11' in line:
print line

This results in the following output:

x11
x11-wm
x11-system

I'm looking to return the list item that just has 'x11'.

Why do you want to have an item you already know?

If you just wanted to check *if* the string "x11" is in the list,
you'd use

if "x11" in mylist:

Regards,
Björn

--
BOFH excuse #221:

The mainframe needs to rest. It's getting old, you know.