How to delete element in an array without using python builtin functions
I have tried this program with builtin functions, but I do not know how to do it without them
c = [6,7,8,9]
c.remove(c[0])
print(c)
I am getting expected result but I want it without using the built-in function in python.
This should do it, but this method creates a new array
c=[6,7,8,9]
d=[]
a=0
for x in c:
if x!=c[a]: #or you write c[0] and remove the a=0
d.append(x)
print(d)
you could use a list comprehension:
c = [ e for e in c if e != c[0] ]
However, if you have multiple instances of the c[0] value, they will all be removed.
removing by index can also be done using a list comprehension:
c = [ e for i,e in enumerate(c) if i != 0 ]
if you know the index of the element that you want to remove:
1) you can concatenate 2 slices of your list that has all the elements except the one you want to remove:
index_to_remove = 0
c = c[0:index_to_remove] + c[index_to_remove + 1:]
2) or by filtering using list comprehension:
c = [e for i, e in enumerate(c) if i != index_to_remove]
if you just want to delete the first element that has a certain value you can use the same methods, you just set:
index_to_remove = c.index(my_value)
from array import *
arr = array("i",[2,4,6,8,9])
del arr[2]
print(arr)
output-array("i",[2,4,8,9])
del method - however, I also don't know why.