Is there a way to output the numbers only from a python list?

Question

Simple Question:

list_1 = [ 'asdada', 1, 123131.131, 'blaa adaraerada', 0.000001, 34.12451235265, 'stackoverflow is awesome' ]

I want to create a list_2 such that it only contains the numbers:

list_2 = [ 1, 123131.131, 0.000001, 34.12451235265 ]

Is there simplistic way of doing this, or do I have to resort to checking the variable type of each list item and only output the numerical ones?

Answer 1

filter(lambda n: isinstance(n, int), [1,2,"three"])

Answer 2

List comprehensions.

list_2 = [num for num in list_1 if isinstance(num, (int,float))]

Answer 3

list_2 = [i for i in list_1 if isinstance(i, (int, float))]

Answer 4

list_2 = [i for i in list_1 if isinstance(i, (int, float))]

Answer 5

>>> [ i for i in list_1 if not str(i).replace(" ","").isalpha() ]
[1, 123131.13099999999, 9.9999999999999995e-07, 34.124512352650001]

Answer 6

This should be the most efficent and shortest:

import operator
filter(operator.isNumberType, list_1)

Edit: this in python 3000:

import numbers
[x for x in list_1 if isinstance(x, numbers.Number)]

Answer 7

for short of SilentGhost way

list_2 = [i for i in list_1 if isinstance(i, (int, float))]

to

list_2 = [i for i in list_1 if not isinstance(i, str)]