I didnt get the NULL values - Printable Version

I didnt get the NULL values - Printable Version

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I didnt get the NULL values - salwa17 - Jul-10-2020

I want to extract the segment len from a TCP header so I made this code:

def tcp_len_list(s):
    a = [len(p[TCP].payload) if p.haslayer(TCP) else None
            for p in s]
    return a

The problem is that extracts all values except 0

Any idea ?