import sys
try:
f = open('integers.txt')
s = f.readline()
i = int(s.strip())
except IOError as err:
(errno, strerror) = err.args
print("I/O error({0}): {1}".format(errno, strerror))
except ValueError:
print("No valid integer in line.")
except:
print("Unexpected error:", sys.exc_info()[0])
raise