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+--- Thread: can't remove element from a list (/thread-22277.html)
can't remove element from a list - yokaso - Nov-06-2019
i have a list and i want to remove all non digit element from it,but got some problem.
there is my code , can you help me:
match = re.compile(r'ROL N°.[0-9][0-9].')
case_title = re.sub(match,'',expression)
num_case= match.search(expression)
first_case_num=[]
first_case_num = num_case.group()
second_case_num= num_case.group()
for case in first_case_num:
if case.isdecimal():
pass
else:
first_case_num.remove(case)Quote:---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
<ipython-input-91-521c272a0c4b> in <module>
27 print(case)
28 else:
---> 29 first_case_num.remove(case)
30
31
AttributeError: 'str' object has no attribute 'remove'
RE: can't remove element from a list - perfringo - Nov-06-2019
What is num_case?
RE: can't remove element from a list - yokaso - Nov-06-2019
i updated my code , that you can see . and sorry
RE: can't remove element from a list - perfringo - Nov-06-2019
As of error I think that this is pretty straightforward: it's shows the row and the problem: first_case_num is string object, not list and therefore Python can't execute this.
But what is your input list and what is expected output?
RE: can't remove element from a list - yokaso - Nov-06-2019
i really confused,
in my code i want to get 10 first element of a string(in this code it's "expression") and affect them to first_case_num , after that i will remove from first_case_num any element who is not numeric.
RE: can't remove element from a list - perfringo - Nov-06-2019
I address the task which is described as 'i want to get 10 first element of a string /../ remove /../ any element who is not numeric.'
To get first 10 elements from string one can use slice (just to remind that non-printable characters/elements in string are as their printable counterparts also characters/elements):
>>> s = '123abc456def789' >>> [char for char in s[:10] if char.isnumeric()] ['1', '2', '3', '4', '5', '6'] >>> ''.join(char for char in s[:10] if char.isnumeric()) '123456'
RE: can't remove element from a list - yokaso - Nov-06-2019
thank you for your response, and it help to get see new idea how to solve the problem.
maybe i didn't explain you well and i am sorry.
when i told you 10 characters it was just to give you an example and simplify .
i need to use regex because the expression that i use to extract the digits can contain white spaces or other special characters .