import numpy as np

def puncturing(message, punct_vec):
    shift = 0
    N = len(punct_vec)
    punctured = []
    for idx, item in enumerate(message):
        if punct_vec[idx-shift*N] == 1:
            punctured.append(item)
        if idx%N == 0:
            shift = shift + 1
    return np.array(punctured)

def depuncturing(punctured, punct_vec, shouldbe):
    shift = 0
    shift2 = 0
    N = len(punct_vec)
    depunctured = np.zeros((shouldbe,))
    for idx, item in enumerate(depunctured):
        if punct_vec[idx - shift*N] == 1:
            depunctured[idx] = float(punctured[idx-shift2])
        else:
            shift2 = shift2 + 1
        if idx%N == 0:
            shift = shift + 1;
    return depunctured

message = np.array([1, 2, 3, 4, 5, 6, 7, 8])
punct_vec = np.array([1, 1, 0])
punctured = puncturing(message, punct_vec)
print(punctured)

depunctured = depuncturing(punctured, punct_vec, len(message))
print(depunctured)