Cryptic python subprocess error - OSError: [Errno 2] No such file or directory

Tshark has become swiss army knief for me and I was experimenting with tshark to extract DNS traffic. A portion of the code is reproduced here:

command = /usr/bin/tshark -i ens33 -nn -T fields -e frame.time -e ip.src -e ip.dst -e dns.count.queries -e dns.count.answers -e dns.qry.name -e dns.qry.type -e dns.resp.name -e dns.resp.type -e dns.resp.ttl -e dns.a -e dns.ns -e dns.mx.mail_exchange -e dns.cname -e dns.txt -e dns.flags.rcode -Y 'dns.count.answers gt 0' -E separator='|'

Traceback (most recent call last):
  File "collect.py", line 59, in <module>
    main()
  File "collect.py", line 45, in main
    tshark_response = subprocess.Popen(command, stdout=subprocess.PIPE, stdin=subprocess.PIPE)
  File "/usr/lib/python2.7/subprocess.py", line 711, in __init__
    errread, errwrite)
  File "/usr/lib/python2.7/subprocess.py", line 1343, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory


After reading the documentation (http://docs.python.org/2/library/subprocess.html#frequently-used-arguments), I realized that "shell=True" should be added as argument and seems one of the easiest option and Vola! It worked.