How to remove only zero digit from python list?

Question

I want to remove 0 only from my list:

>>> mylist = [0, 1, None, 2, False, 1, 0]

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Answer 1

The x is not 0 approach works, but is probably not optimal. There speed enhancements by using a list comprehension instead of using calls to list() and to filter().

Running this in a Jupyter notebook and taking advantage of the builtin %timeit magic to see how quickly each of these can return the result.

mylist = [0, 1, None, 2, False, 1, 0]

Using list() and filter()

%timeit list(filter(lambda x: x is not 0, mylist))
**1.12 µs** ± 17.7 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each)

Using a list comprehsion

%timeit [i for i in mylist if i is not 0]
**411 ns** ± 8.42 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each)

We see that the list comprehension technique is significantly faster.