Syntax error on with only when specifying open() mode

Question

I have the following file:

import sys

lines = []
with open(sys.argv[1]) as f: #this works fine
    for line in f:
        lines.append(line.replace('\\', '/')
with open(sys.argv[1], 'w') as f: #this gives a syntax error
    for line in lines:
        f.write(line)

Whenever I try to run it, I get a syntax error on the with part of the second with statement:

  File "ChangeSlashes.py", line 7
    with open(sys.argv[1], 'w') as f:
       ^
SyntaxError: invalid syntax

Why is this happening, and why is it only when I specify the mode in open()?

lines.append(line.replace('\\', '/') didnt close parens on previous line. — Paul Rooney
– Paul Rooney, Commented Oct 30, 2016 at 23:54
@PaulRooney Of course. And here I was thinking it's some obscure version difference thing or something. — cat40
– cat40, Commented Oct 30, 2016 at 23:57
Its a shame it can't point to the line with the problem. I get this issue all the time particularly with IDE's that swallow parens. You just learn to look for it after a while though. — Paul Rooney
– Paul Rooney, Commented Oct 31, 2016 at 0:00

domandinho · Accepted Answer · 2016-10-30 23:57:39Z

2

Replace

lines.append(line.replace('\\', '/')

with:

lines.append(line.replace('\\', '/'))

answered Oct 30, 2016 at 23:57

domandinho

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