Python Errors

[kendias]

Got rid of Global so now only 1 error. Had a look at the 2 links you sent, they seemed very general but will take a detailed look.
Code:

def init_serial():
print "Found Ports:"
for n,s in scan():
  print "%s" % s
print " "
COMNUM = '5' #set you COM port # here
#must be declared in each fxn used
ser = serial.Serial()
ser.baudrate = 4800
ser.port = COMNUM -1#starts at 0, so subtract 1

Error:

Error:
TypeErrorTraceback (most recent call last)
C:\Users\Dell\Downloads\lat_lon1.py in <module>()
    27 ser = serial.Serial()
    28 ser.baudrate = 4800
---> 29 ser.port = COMNUM -1#starts at 0, so subtract 1
    30 
    31 ser.timeout = 1 #you must specify a timeout (in seconds) so that the serial port doesn't hang
TypeError: unsupported operand type(s) for -: 'str' and 'int'