Either I'm crazy and I'm missing the obvious here or there is something
wrong with this code. Element 5 of this list says it doesn't contain the
string 255, when that's *ALL* it contains... why would it think that???
import time
ips = ['255.255.255.25 5', '128.173.120.79 ', '198.82.247.98' ,
'127.0.0.1', '255.0.0.0', '255', '128.173.255.34 ']
for ip in ips:
if '255' in ip:
try:
print "Removing", ip
ips.remove(ip)
except Exception, e:
print e
print ips
time.sleep(5)
Someone tell me I'm going crazy ;)
28  1535 
I think it's because you're modifying the list as you're iterating over
it. Try this:
import time
ips = ['255.255.255.25 5', '128.173.120.79 ', '198.82.247.98' ,
'127.0.0.1', '255.0.0.0', '255', '128.173.255.34 ']
ips_new = []
for ip in ips:
if '255' not in ip:
ips_new.append( ip)
print ips_new
Or this:
ips_new = [ip for ip in ips if '255' not in ip]
print ips_new
Hope this helps,
Alan McIntyre http://www.esrgtech.com
rbt wrote: Either I'm crazy and I'm missing the obvious here or there is something
wrong with this code. Element 5 of this list says it doesn't contain the
string 255, when that's *ALL* it contains... why would it think that???
import time
ips = ['255.255.255.25 5', '128.173.120.79 ', '198.82.247.98' ,
'127.0.0.1', '255.0.0.0', '255', '128.173.255.34 ']
for ip in ips:
if '255' in ip:
try:
print "Removing", ip
ips.remove(ip)
except Exception, e:
print e
print ips
time.sleep(5)
Someone tell me I'm going crazy ;)
rbt wrote: Either I'm crazy and I'm missing the obvious here or there is something
wrong with this code. Element 5 of this list says it doesn't contain the
string 255, when that's *ALL* it contains... why would it think that???
import time
ips = ['255.255.255.25 5', '128.173.120.79 ', '198.82.247.98' ,
'127.0.0.1', '255.0.0.0', '255', '128.173.255.34 ']
for ip in ips:
if '255' in ip:
try:
print "Removing", ip
ips.remove(ip)
except Exception, e:
print e
print ips
time.sleep(5)
Someone tell me I'm going crazy ;)
You're going crazy. ;)
py> ips = ['255.255.255.25 5', '128.173.120.79 ', '198.82.247.98' ,
'127.0.0.1', '255.0.0.0', '255', '128.173.255.34 ']
py> for ip in ips:
.... # debugging statement:
.... print "Looking at", ip
.... if '255' in ip:
.... try:
.... print "Removing", ip
.... ips.remove(ip)
.... except Exception, e:
.... print e
....
Looking at 255.255.255.255
Removing 255.255.255.255
Looking at 198.82.247.98
Looking at 127.0.0.1
Looking at 255.0.0.0
Removing 255.0.0.0
Looking at 128.173.255.34
Removing 128.173.255.34
Notice how elements of your list are being skipped. The problem is that
you're modifying a list while you iterate over it.
Why don't you try a list comprehension:
py> ips = ['255.255.255.25 5', '128.173.120.79 ', '198.82.247.98' ,
'127.0.0.1', '255.0.0.0', '255', '128.173.255.34 ']
py> [ip for ip in ips if '255' not in ip]
['128.173.120.79 ', '198.82.247.98' , '127.0.0.1']
Steve
rbt wrote: Either I'm crazy and I'm missing the obvious here or there is something
wrong with this code. Element 5 of this list says it doesn't contain the
string 255, when that's *ALL* it contains... why would it think that???
import time
ips = ['255.255.255.25 5', '128.173.120.79 ', '198.82.247.98' ,
'127.0.0.1', '255.0.0.0', '255', '128.173.255.34 ']
for ip in ips:
if '255' in ip:
try:
print "Removing", ip
ips.remove(ip)
except Exception, e:
print e
print ips
time.sleep(5)
Someone tell me I'm going crazy ;)
You are modifying the list as you iterate over it. Instead, iterate over
a copy by using:
for ip in ips[:]:
...
regards
Steve
--
Meet the Python developers and your c.l.py favorites March 23-25
Come to PyCon DC 2005 http://www.pycon.org/
Steve Holden http://www.holdenweb.com/
On Fri, 04 Feb 2005 14:23:36 -0500, rbt <rb*@athop1.ath .vt.edu> wrote: Either I'm crazy and I'm missing the obvious here or there is something
wrong with this code. Element 5 of this list says it doesn't contain the
string 255, when that's *ALL* it contains... why would it think that???
import time
ips = ['255.255.255.25 5', '128.173.120.79 ', '198.82.247.98' ,
'127.0.0.1', '255.0.0.0', '255', '128.173.255.34 ']
for ip in ips:
if '255' in ip:
try:
print "Removing", ip
ips.remove(ip)
except Exception, e:
print e
print ips
time.sleep(5)
You're gong crazy: ips = ['255.255.255.25 5', '128.173.120.79 ', '198.82.247.98' ,
.... '127.0.0.1', '255.0.0.0', '255', '128.173.255.34 '] for ip in ips:
.... if '255' in ip: print ip
....
255.255.255.255
255.0.0.0
255
128.173.255.34
The problem is that you're operating in-place on an array while it's
being iterated over. Since the iterator is only created once, you're
can't change the array while you're iterating over it. Instead, try a
list comprehension:
ips = [ip for ip in ips if '255' not in ip]
ips
['128.173.120.79 ', '198.82.247.98' , '127.0.0.1']
Peace
Bill Mill
bill.mill at gmail.com
Thanks guys... list comprehension it is!
Bill Mill wrote: On Fri, 04 Feb 2005 14:23:36 -0500, rbt <rb*@athop1.ath .vt.edu> wrote:
Either I'm crazy and I'm missing the obvious here or there is something
wrong with this code. Element 5 of this list says it doesn't contain the
string 255, when that's *ALL* it contains... why would it think that???
import time
ips = ['255.255.255.25 5', '128.173.120.79 ', '198.82.247.98' ,
'127.0.0.1' , '255.0.0.0', '255', '128.173.255.34 ']
for ip in ips:
if '255' in ip:
try:
print "Removing", ip
ips.remove(ip)
except Exception, e:
print e
print ips
time.sleep( 5)
You're gong crazy:
ips = ['255.255.255.25 5', '128.173.120.79 ', '198.82.247.98' ,
... '127.0.0.1', '255.0.0.0', '255', '128.173.255.34 ']
for ip in ips:
... if '255' in ip: print ip
...
255.255.255.255
255.0.0.0
255
128.173.255.34
The problem is that you're operating in-place on an array while it's
being iterated over. Since the iterator is only created once, you're
can't change the array while you're iterating over it. Instead, try a
list comprehension:
ips = [ip for ip in ips if '255' not in ip]
ips
['128.173.120.79 ', '198.82.247.98' , '127.0.0.1']
Peace
Bill Mill
bill.mill at gmail.com
Wow, that's cool; I'd never seen that before. :) Thanks, Steve..
Steve Holden wrote: You are modifying the list as you iterate over it. Instead, iterate over
a copy by using:
for ip in ips[:]:
...
regards
Steve
Steve Holden wrote: rbt wrote:
Either I'm crazy and I'm missing the obvious here or there is
something wrong with this code. Element 5 of this list says it doesn't
contain the string 255, when that's *ALL* it contains... why would it
think that???
import time
ips = ['255.255.255.25 5', '128.173.120.79 ', '198.82.247.98' ,
'127.0.0.1', '255.0.0.0', '255', '128.173.255.34 ']
for ip in ips:
if '255' in ip:
try:
print "Removing", ip
ips.remove(ip)
except Exception, e:
print e
print ips
time.sleep(5)
Someone tell me I'm going crazy ;)
You are modifying the list as you iterate over it. Instead, iterate over
a copy by using:
for ip in ips[:]:
...
regards
Steve
Very neat. That's a trick that everyone should know about. I vote it
goes in Dr. Dobbs newsletter.
Steve Holden wrote: You are modifying the list as you iterate over it. Instead, iterate over
a copy by using:
for ip in ips[:]:
...
Also worth noting, you can write this like:
for ip in list(ips):
...
if you're afraid of smiley-faces [:] in your code. ;)
Steve
Alan McIntyre wrote: I think it's because you're modifying the list as you're iterating over
In this case then, shouldn't my 'except Exception' raise an error or
warning like:
"Hey, stupid, you can't iterate and object and change it at the same time!"
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