[Tutor] create an xls file using data from a txt file

[Prasad, Ramit]

>your "\" is a "/"

>when writing out a string, such as 'C:\test.xls', the "/" is an escape in python. So you have two choices, You can either write
out path = 'C:\\test.xls', which will be 'C:\test.xls' or you can write out path = r'C:\test.xls' the "r" bit tells python that the following is a regular expression. or regex.


'/' is perfectly valid Windows separator. See the tested examples below. It works just fine pretty much anywhere I have ever tried it, including the command line. (except apparently for an MSOffice file save dialog that I tried just now)

>>> import xlwt
>>> workbook = xlwt.Workbook()
>>> sheet = workbook.add_sheet('test')
>>> sheet.write(0,0,'test')
>>> workbook.save('C:/test')
>>> workbook.save('C:/test.xls')
>>> workbook.save('C:\\test2.xls')
>>> workbook.save(r'C:\test3.xls')
>>>


The error he is getting may be unrelated to actually saving. I am not very familiar with the xlwt, but I know it does not write everything to file on the sheet.write() command. Save() actually does some writing and then saves the file. This can lead to misleading errors. I have had a similar error when writing non-ASCII data (and not changing the default ASCII encoding type).


Furthermore, the escape character is '\' not '/',

And r'string'  means raw string not regular expression.
"String literals may optionally be prefixed with a letter 'r' or 'R'; such strings are called raw strings and use different rules for interpreting backslash escape sequences." ~ http://docs.python.org/reference/lexical_analysis.html


Ramit



Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
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