Q:

Remove items from a list while iterating using python programming

YasminRadwan26
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2022-05-05
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Remove items from a list while iterating

Description:

In this question, You need to remove items from a list while iterating but without creating a different copy of a list.

Remove numbers greater than 50

Given:

number_list = [10, 20, 30, 40, 50, 60, 70, 80, 90, 100]

Expected Output: -

[10, 20, 30, 40, 50]
Python programming,
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All Answers

YasminRadwan26
2022-05-05
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Hint:

  • Get the list's size
  • Iterate list using while loop
  • Check if the number is greater than 50
  • If yes, delete the item using a del keyword
  • Reduce the list size

Solution1:Using while loop

number_list = [10, 20, 30, 40, 50, 60, 70, 80, 90, 100]
i = 0
# get list's size
n = len(number_list)
# iterate list till i is smaller than n
while i < n:
    # check if number is greater than 50
    if number_list[i] > 50:
        # delete current index from list
        del number_list[i]
        # reduce the list size
        n = n - 1
    else:
        # move to next item
        i = i + 1
print(number_list)

Solution2:Using for loop and range()

number_list = [10, 20, 30, 40, 50, 60, 70, 80, 90, 100]
for i in range(len(number_list) - 1, -1, -1):
    if number_list[i] > 50:
        del number_list[i]
print(number_list)

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