This is a simple example for python filter

python_filter_example.py

def evenFilter(d):
    if d['idx'] % 2 == 0:
        return True
    else:
        return False

if __name__ == '__main__':
    L = []
    for i in range(10):
        d={}
        d['idx'] = i
        L.append(d)
    print(L)
    fL = list(filter(evenFilter,L))
    print(fL)