python> vérifier NoneType ou non> si a == None:> si a vaut None:

Raspberry Pi2 + raspbian

def read_fileModificationDate_sendText():
    srcpath="/home/pi/BYOP/send.txt"    
    if os.path.isfile(srcpath) == False:
        return ""
    mddt = time.ctime(os.path.getmtime(srcpath))
    parsed = time.strptime(mddt)
    yyyymmdd = time.strftime("%Y%m%d", parsed)
    return yyyymmdd

>>> a = None
>>> if a == None:
... print "None"
...
None

def read_sendtext():
#    debug_outputDebugString("read_sendtext","Line52 > start")
    srcpath="/home/pi/BYOP/send.txt"

    if os.path.isfile(srcpath) == False:
#        debug_outputDebugString("read_sendtext","Line55 > send.txt not found");
        return
    rdfd = open(srcpath)
    lines = rdfd.readlines()
    rdfd.close()

#    debug_outputDebugString("read_sendtext","Line80 > lines:" + str(lines))

    return lines

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