Problem with list.remove() method
ramit.prasad at jpmorgan.com
Tue Nov 20 21:47:47 CET 2012
Alvaro Combo wrote:
> Hi All,
> I'm relatively new to Python... but I have found something I cannot explain... and I'm sure you can help me.
> I have the following function that serves for removing the duplicates from a list... It's a simple and (almost)
> trivial task.
> I'm using WingIDE as editor/debugger and have Python 2.7.3.
> When running this I have an error when trying to remove cpy_lst... and ONLY THAT!!! Even in interactive
> Any suggestion is MOST welcome.
> Best Regards
> ...And the code:
> def remove_dup_5_10():
> Remove the duplicates of a given list. The original list MUST be kept.
> # Set the original list
> lst = ['a', 1, 10.0, 2, 'd', 'b', 'b', 'b', 1, 2, 'b' ]
> # NEED to create a copy... See dicussion on Problem 5.6 and issue #2
> cpy_lst = list(lst)
> # Perform an infinite loop... explained later
> i=0 # initialize the index
> while i != len(cpy_lst):
> if cpy_lst.count(cpy_lst[i]) != 1:
> i += 1
> print "The original List: ", lst
> print "List with NO duplicates: ", cpy_lst
> return True
Remove looks for the *value* not the *index* of the value.
Help on built-in function remove:
L.remove(value) -- remove first occurrence of value.
Raises ValueError if the value is not present.
Change ` cpy_lst.remove(i)` to `cpy_lst.remove(cpy_lst[i])`.
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