I'm totally new to Python and I'm sure I'm missing something simple, I want to remove all Strings.
def filter_list(l):
for f in l:
if isinstance(f, str):
l.remove(f)
return l
print(filter_list([1,2,'a','b']))
The output I get is:
[1,2,'b']
Your error came from removing items from list in iteration and at last, you don't check the last item (for more details read this : How to remove items from a list while iterating?) For this approach remove items with list comprehension.
def filter_list(l):
return [f for f in l if not isinstance(f, str)]
print(filter_list([1,2,'a','b']))
# [1, 2]
Often when we need to filter a sublist from a list given a condition, you'll see this sort of syntax (i.e. list comprehension) quite commonly, which serves to do the exact same thing. It's up to you which style you prefer:
a = [1,2,'a','b']
b = [x for x in a if not isinstance(x, str)]
print(b) # [1, 2]
so you can do something like
def filter_list(l)
for f in l:
if type(f) == str:
l.remove(f)
return l
