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deleting select items from a list
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deleting select items from a list
#13
(Oct-10-2021, 06:11 PM)Skaperen Wrote: one of the ways could include for x in range(len(the_list)-1,-1,-1): (i like variable name x, think: index). if i delete the_list[x] inside the body of this for loop
Yes to make code more ugly and less readable could do that 🧺
names = ["Alice", "Bob", "Andrew", "Charlie"]
for item in range(len(names)-1,-1,-1):
    if not names[item].startswith('A'):
        del names[item]
print(names)
Output:
['Alice', 'Andrew']
It's faster than remove() solution,but still slower than:
names = ["Alice", "Bob", "Andrew", "Charlie"]
names = [name for name in names if name.startswith('A')]
print(names)
Output:
['Alice', 'Andrew']
If think in place is cool,so is there a way with this the last one.
names = ["Alice", "Bob", "Andrew", "Charlie"]
print(id(names))
names[:] = [name for name in names if name.startswith('A')]
print(names)
print(id(names))
Output:
2496125597184 ['Alice', 'Andrew'] 2496125597184
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Messages In This Thread
deleting select items from a list - by Skaperen - Oct-08-2021, 01:53 AM
RE: deleting select items from a list - by Yoriz - Oct-08-2021, 05:32 AM
RE: deleting select items from a list - by Skaperen - Oct-10-2021, 01:50 AM
RE: deleting select items from a list - by ndc85430 - Oct-08-2021, 11:56 AM
RE: deleting select items from a list - by ndc85430 - Oct-09-2021, 12:19 PM
RE: deleting select items from a list - by snippsat - Oct-09-2021, 01:32 PM
RE: deleting select items from a list - by DeaD_EyE - Oct-09-2021, 02:52 PM
RE: deleting select items from a list - by Skaperen - Oct-10-2021, 01:36 AM
RE: deleting select items from a list - by Skaperen - Oct-10-2021, 01:41 AM
RE: deleting select items from a list - by ndc85430 - Oct-10-2021, 05:00 AM
RE: deleting select items from a list - by Skaperen - Oct-10-2021, 06:11 PM
RE: deleting select items from a list - by snippsat - Oct-10-2021, 09:54 PM
RE: deleting select items from a list - by Skaperen - Oct-11-2021, 01:02 AM

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