7

I am trying to use "With open()" with python 2.6 and it is giving error(Syntax error) while it works fine with python 2.7.3 Am I missing something or some import to make my program work!

Any help would be appreciated.

Br

My code is here:

def compare_some_text_of_a_file(self, exportfileTransferFolder, exportfileCheckFilesFolder) :
    flag = 0
    error = ""
    with open("check_files/"+exportfileCheckFilesFolder+".txt") as f1,open("transfer-out/"+exportfileTransferFolder) as f2:

        if f1.read().strip() in f2.read():
            print ""
        else:
            flag = 1
            error = exportfileCheckFilesFolder
            error = "Data of file " + error + " do not match with exported data\n"
        if flag == 1:   
            raise AssertionError(error)
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1
  • 2
    if you have the literal line with open() this will give a syntax error even in 2.7. Can you update your question with the code that is giving the syntax error? Commented Aug 27, 2012 at 9:19

3 Answers 3

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11

The with open() statement is supported in Python 2.6, you must have a different error.

See PEP 343 and the python File Objects documentation for the details.

Quick demo:

Python 2.6.8 (unknown, Apr 19 2012, 01:24:00) 
[GCC 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2335.15.00)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> with open('/tmp/test/a.txt') as f:
...     print f.readline()
... 
foo

>>>

You are trying to use the with statement with multiple context managers though, which was only added in Python 2.7:

Changed in version 2.7: Support for multiple context expressions.

Use nested statements instead in 2.6:

with open("check_files/"+exportfileCheckFilesFolder+".txt") as f1:
    with open("transfer-out/"+exportfileTransferFolder) as f2:
        # f1 and f2 are now both open.
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11 Comments

@Martjin why did I get a ban ! can you help me with that please !
@Sara: Including more detail would help much more. It is not just this question that would have triggered the ban, it is based on your overall use of Stack Overflow, not on just one post. Adding more detail like your exact code, the stack trace of the error, etc. would have helped me give you much more information about what goes wrong, for example.
@Sara: I more meant you should probably have posted it in this question in the first place; the lack of such detail is probably why it was voted down to start with.
@glglgl I say thanks and I would take care of all this stuff in future :)
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5

It is the "extended" with statement with multiple context expressions which causes your trouble.

In 2.6, instead of 

with open(...) as f1, open(...) as f2:
    do_stuff()

you should add a nesting level and write

with open(...) as f1:
    with open(...) as f2:
        do.stuff()

The docu says

Changed in version 2.7: Support for multiple context expressions.

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Comments

0

The with open() syntax is supported by Python 2.6. On Python 2.4 it is not supported and gives a syntax error. If you need to support PYthon 2.4, I would suggest something like:

def readfile(filename, mode='r'):
    f = open(filename, mode)
    try:
        for line in f:
            yield f
    except e:
        f.close()
        raise e
    f.close()

for line in readfile(myfile):
    print line
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4 Comments

why did I get a ban ! can you help me with that pleash !
can you give a positive ranking to my qustion please:) it would help me lifting my ban ! please
@Sara This is not helpful as well: adding these requests to a completely unrelated answer. If, then put them to your question.
and concerning "can you give a positive ranking to my qustion please": people will do that if they think it is a good question. Now that it contains the code, it might be considered good and people might start upvoting.

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