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For your posted python issue, try adding a space between the tcp stream index and the output redirection operator ">", i.e.

#!usr/bin/python
import os

for m in range(14):
    print("tshark -r data/aim_chat_3a.pcap tcp.stream eq %i >data/%i.txt" %(m, m))
    os.system("tshark -r data/aim_chat_3a.pcap tcp.stream eq %i >data/%i.txt" %(m, m))