with open('myFile', 'r') as csvfile:
theReader = csv.reader(csvfile)
for row in theReader:
     # my logic here

with open('myFile', 'rb') as csvfile:
     reader = csv.reader(filter_line(line) for line in csvfile)
     for row in reader:
         # my logic here

from contextlib import contextmanager

@contextmanager
def csv_factory(filename, mode="r"):
    # setup here
    fileobj = open(filename, mode)
    reader = mycsv.reader(fileobj)
    try:
        yield reader # return value for usage in with
    finally:
        fileobj.close() # clean up here


with csv_factory("myFile") as csvfile:
    for line in csvfile:
        print(line)

for line in sys.stdin.readlines():
    # some extra code goes here