I want a function that removes values from a list if a predicate evaluates
to True. The best I could come up with is:
def extract(lst, pred):
idx = 0
ret = []
for obj in lst[:]:
if pred(obj):
ret.append(obj)
lst.pop(idx)
else:
idx += 1
return ret
Anybody have a better, more Pythonic solution? One of my failed attempts was
this code, which fails when the predicate itself has "state":
def extract(lst, pred):
# BAD: Would not work in a case like pred = "extract every other object"
ret = filter(lst, pred)
for obj in ret:
lst.remove(obj)
return ret
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