Ones and Zeros

DESCRIPTION:

Given an array of ones and zeroes, convert the equivalent binary value to an integer.

Eg: [0, 0, 0, 1] is treated as 0001 which is the binary representation of 1.

Examples:

Testing: [0, 0, 0, 1] ==> 1
Testing: [0, 0, 1, 0] ==> 2
Testing: [0, 1, 0, 1] ==> 5
Testing: [1, 0, 0, 1] ==> 9
Testing: [0, 0, 1, 0] ==> 2
Testing: [0, 1, 1, 0] ==> 6
Testing: [1, 1, 1, 1] ==> 15
Testing: [1, 0, 1, 1] ==> 11

However, the arrays can have varying lengths, not just limited to 4.

---

def binary_array_to_number(arr):
    
    print(arr)
    
    leng=len(arr)
    arr=arr[::-1]
    
    print(arr)
    
    ans=0
    for i in range(leng):
        ans+=arr[i]*(2**i)
        print(ans)
    
    return ans