how can I add r' into variable in python?

Question

I have two functions in my program one will take the path from user and another will open the file in that path, this function will open the file

def pdfparser(filename):
    fp = file(filename, 'rb')

when I pass the path from another function it returns:

IOError: [Errno 22] invalid mode ('rb') or filename:'C:\\Users\\user\\PycharmProjects\\advisor\\website\\a.PDF

I know I have to add double splash to the path or (r'path) but my question how can I add r' or double slash into variable since the path will be stored in variable and pass into another function. I need something like s=r'path

any help please

The r prefix is only for constants. Once the string has the correct value, no need to specify r prefix again. Are you sure the file exists on your system? Try to print filename just before opening it, and copy/paste it in a windows explorer to see it windows finds it. — Jean-François Fabre
– Jean-François Fabre ♦, Commented Jul 4, 2016 at 20:37
I am not sure I understand the question (is the IOError really complete? What about the stacktrace), but what does not work with filename = r'C:\Users\user\PycharmProjects\advisor\website\a.PDF besides os.path.join() being far cooler ...? — Dilettant
– Dilettant, Commented Jul 4, 2016 at 20:38
Your error indicates the filename was correctly specified; all the backslashes are correct. The problem you have is not one that can be solved with prefixing r somewhere. Note that r'...' is just a syntax to specify a string value, it is not a separate object type. It just tells the parser not to interpret \.. escape sequences. Because this is a syntax concept there is no dynamic counterpart. — Martijn Pieters
– Martijn Pieters, Commented Jul 4, 2016 at 20:44
@Jean-François Fabre it exists I have tried that but when I pass 'C:\Users\user\PycharmProjects\advisor\website\a.PDF it does not work but when I add double slash or r' works but the idea my path is sorted within a variable so how can I add r' or double space — angela
– angela, Commented Jul 4, 2016 at 20:48
@Dilettant I can't add r' into path because my path within variable in another function — angela
– angela, Commented Jul 4, 2016 at 20:53

Shubham Chourasia · Accepted Answer · 2018-08-27 08:58:08Z

1

Do this:

Before calling this function, store the path value in any variable say, 'directory', here u add the prefix r' in filepath. When calling this pdfparser(filename) function, just pass 'directory' as argument. It works!

>directory= r"C:\Users\SomeUser\Pictures\Disk"  
>pdfparser(directory)

answered Aug 27, 2018 at 8:58

Shubham Chourasia

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1 Comment

fsevenm Over a year ago

At first sight, I was afraid this could not work. But after tested it, it just worked.

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