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I have a set myset, and I have a function which iterates over it to perform some operation on its items and this operation ultimately deletes the item from the set.
Obviously, I cannot do it while still iterating over the original set. I can, however, do this:
mylist = list(myset) for item in mylist: # do sth Is there any better way?
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Since we can't modify a set while iterating over it, we can create a duplicate set and remove elements that satisfy the condition from the original set by iterating over the duplicate set.
If you want to delete elements from a list while iterating, use a while-loop so you can alter the current index and end index after each deletion.
Python Set remove() MethodThe remove() method removes the specified element from the set. This method is different from the discard() method, because the remove() method will raise an error if the specified item does not exist, and the discard() method will not.
First, using a set, as Zero Piraeus told us, you can
myset = set([3,4,5,6,2]) while myset: myset.pop() print(myset) I added a print method giving these outputs
>>> set([3, 4, 5, 6]) set([4, 5, 6]) set([5, 6]) set([6]) set([]) If you want to stick to your choice for a list, I suggest you deep copy the list using a list comprehension, and loop over the copy, while removing items from original list. In my example, I make length of original list decrease at each loop.
l = list(myset) l_copy = [x for x in l] for k in l_copy: l = l[1:] print(l) gives
>>> [3, 4, 5, 6] [4, 5, 6] [5, 6] [6] [] If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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