iterate start at second row in file not first

[notnorwegian at yahoo.se]

i have a big file with sentences, the first file of each sentence
contains a colon(:) somewher eon that line
i want to jump past that sentence.

if all(x != ':' for x in line):

this way i  can check but i dont want to check for every line in the
whole file, quite unnecessary when i only need to
chekc the first line.


so the question is, when dealign with iterators like:
mov = open(afile)
for line in mov:
	do y

how do i jump the first step there? i dont want to iterate the first
row...how do i start at the second?