SyntaxError trying to execute python 3 code with python 2.7

Question

I run the python 3 code which from others code as following in the python 2.7 environment, there is error as following, please give me some hints how to solve it, thanks! If you want more information, please tell me.

python code:

#! /usr/bin/env python

from __future__ import print_function
import argparse
from collections import defaultdict
import numpy as np
import os
import sys
import utils


if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument('target')
    args = parser.parse_args()

    target = defaultdict(list)
    for i, line in enumerate(sys.stdin):
        filename, score, *rect = line.strip().split()
        name, _ = os.path.splitext(filename)
        score = float(score)
        rect = tuple(map(float, rect))
        target[name].append((score, rect))

        if (i + 1) % 1000 == 0:
            print(i + 1, file=sys.stderr)

    for name in target.keys():
        target[name] = np.array(target[name], dtype=utils.dtype)
        target[name].sort(order=('score',))
        target[name][:] = target[name][::-1]

    np.savez_compressed(args.target, **target)

the error:

File "./scripts/lo.py", line 19
    filename, score, *rect = line.strip().split()
                     ^
SyntaxError: invalid syntax

Possible duplicate of [Python star unpacking for version 2.7](http://stackoverflow.com/questions/10792970/python-star-unpacking-for-version-2-7) — Matthias, Apr 19 '17 at 11:55

score 8 · Answer 1 · edited May 23 '17 at 11:46

8

Extended Iterable Upacking is only available in Python 3.0 and later.

Refer to this question for workarounds.

edited May 23 '17 at 11:46

Community

1
1

answered Apr 19 '17 at 10:37

timgeb

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hi @timgeb thanks for your comments, how to solve this problem in python2 – tktktk0711 Apr 19 '17 at 10:50
@tktktk0711 See the second part of my answer. – timgeb Apr 19 '17 at 10:52

martineau · Accepted Answer · 2017-04-20T12:26:28.143

The script is using something called "Extended Iterable Unpacking" which was added to Python 3.0.
The feature is described in PEP 3132.

To do the same thing in Python 2, replace the problem line:

    filename, score, *rect = line.strip().split()

with these two lines:

    seq = line.strip().split()
    filename, score, rect = seq[0], seq[1], seq[2:]

OR these two:

   seq = line.strip().split()
   (filename, score), rect = seq[:2], seq[2:]

SyntaxError trying to execute python 3 code with python 2.7

2 Answers2

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