how to remove an item in a list of list of string using index in python
Question:
input:
letters = [['a', 'b', 'c'], ['a', 'b', 'c']]
row= 0
column=0
output
[['b', 'c'], ['a', 'b', 'c']]
I tried to do this:
letters[0].remove(0)
but it gives me a value error, while when I use pop like this:
letters[0].pop(0)
it does what I need but the problem with pop is that it returns me something while I just need the item to be removed
Answers:
letters = [['a', 'b', 'c'], ['a', 'b', 'c']]
del list1[0][0]
use the del keyword
list.remove()
removes an item by value, not by index. So letters[0].remove('b')
would work.
- Simply deleting a single element with the same syntax, you could address it in any other statement is
del
which could be used as del letters[0][0]
- As @Barmar said:
list.pop)
can return an element by index and remove it from the list.
You can try this if you want to delete the element by index value of the list:
del letters[0][0] # [['b', 'c'], ['a', 'b', 'c']]
del letters[1][0] # [['a', 'b', 'c'], ['b', 'c']]
or if you want remove specific value in the first occurance:
letters[0].remove('a') # [['b', 'c'], ['a', 'b', 'c']]
letters[1].remove('a') # [['a', 'b', 'c'], ['b', 'c']]
input:
letters = [['a', 'b', 'c'], ['a', 'b', 'c']]
row= 0
column=0
output
[['b', 'c'], ['a', 'b', 'c']]
I tried to do this:
letters[0].remove(0)
but it gives me a value error, while when I use pop like this:
letters[0].pop(0)
it does what I need but the problem with pop is that it returns me something while I just need the item to be removed
letters = [['a', 'b', 'c'], ['a', 'b', 'c']]
del list1[0][0]
use the del keyword
list.remove()
removes an item by value, not by index. Soletters[0].remove('b')
would work.- Simply deleting a single element with the same syntax, you could address it in any other statement is
del
which could be used asdel letters[0][0]
- As @Barmar said:
list.pop)
can return an element by index and remove it from the list.
You can try this if you want to delete the element by index value of the list:
del letters[0][0] # [['b', 'c'], ['a', 'b', 'c']]
del letters[1][0] # [['a', 'b', 'c'], ['b', 'c']]
or if you want remove specific value in the first occurance:
letters[0].remove('a') # [['b', 'c'], ['a', 'b', 'c']]
letters[1].remove('a') # [['a', 'b', 'c'], ['b', 'c']]