Maybe you can try a regex, something like
------
import re
pattern = re.compile('^(\d+)/(\d+).*')
def read_data(filename):
fh = open(filename, "r", encoding="ascii")
for line in fh:
if pattern.match(line):
dip_,dir_ = pattern.match(line).groups()
dip.append(dip_)
dir.append(dir_)
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