przenoszenie programu Python 2 na Python 3, generator losowych linii

#!/usr/bin/pythonimport random, sys

from optparse import OptionParserclass randline:

 def __init__(self, filename):

 f = open(filename, 'r')

 self.lines = f.readlines()

 f.close() def chooseline(self):

 return random.choice(self.lines)def main():

 version_msg = "%prog 2.0"

 usage_msg = """%prog [OPTION]... [FILE] [FILE]...Output randomly selected lines from each FILE.""" parser = OptionParser(version=version_msg,

 usage=usage_msg)

 parser.add_option("-n", "--numlines",

 action="store", dest="numlines", default=1,

 help="output NUMLINES lines (default 1)")

 options, args = parser.parse_args(sys.argv[1:]) try:

 numlines = int(options.numlines)

 except:

 parser.error("invalid NUMLINES: {0}".

 format(options.numlines))

 if numlines < 0:

 parser.error("negative count: {0}".

 format(numlines))

 if len(args) < 1:

 parser.error("input at least one operand!") for index in range(len(args)):

 input_file = args[index]

 try:

 generator = randline(input_file)

 for index in range(numlines):

 sys.stdout.write(generator.chooseline())

 except IOError as (errno, strerror):

 parser.error("I/O error({0}): {1}".

 format(errno, strerror))if __name__ == "__main__":

 main()

python3 randline.py -n 1 file.txt

File "randline.py", line 66

 except IOError as (errno, strerror):

 ^

SyntaxError: invalid syntax