Binary as list of 1s and 0s to int

Question

I would like to convert a list of integer 1s and 0s which represent a binary number to an int.

something along the lines of:

>>> [1,1,0,1].toint()

would give an output of 13

Answer 1

Strings are unnecessary here:

>>> l = [1,1,0,1]
>>> 
>>> sum(j<<i for i,j in enumerate(reversed(l)))
13

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Relevant documentation:

• sum()
• enumerate()
• reversed()

Answer 2

You can do:

>>> int(''.join(map(str, my_list)), 2)
5