Python直接路径文件打印问题？

Question

So I have a script that needs to print to a file in a different directory. I give that absolute path and python doesn't like it.

Here's where the file is located: C:\\Users\\Owner\\Documents\\Senior_design\\QT_Library\\build-TransmitterPlot-Desktop_Qt_5_0_2_MSVC2010_32bit-Debug\\numbers.txt

(I know, long path, but QT plotter makes the file names really long)

I typed:

textfile = open('C:\Users\Owner\Documents\Senior_design\QT_Library\build-TransmitterPlot-Desktop_Qt_5_0_2_MSVC2010_32bit-Debug\numbers.txt', 'w')

And I get this error:

IOError: [Errno 22] invalid mode ('w') or filename:

I've read that I can use relative paths, but I am unsure how to give it a relative path with so many directories to go through.

Thanks!

Answer 1

The problem is that python is interpreting the backslashes in your path as escape sequences:

>>> 'C:\Users\Owner\Documents\Senior_design\QT_Library\build-TransmitterPlot-Desktop_Qt_5_0_2_MSVC2010_32bit-Debug\numbers.txt'
'C:\\Users\\Owner\\Documents\\Senior_design\\QT_Library\x08uild-TransmitterPlot-Desktop_Qt_5_0_2_MSVC2010_32bit-Debug\numbers.txt'

Notice that both \\b and \\n get translated to something else. Use a "raw" string instead:

>>> r'C:\Users\Owner\Documents\Senior_design\QT_Library\build-TransmitterPlot-Desktop_Qt_5_0_2_MSVC2010_32bit-Debug\numbers.txt'
'C:\\Users\\Owner\\Documents\\Senior_design\\QT_Library\\build-TransmitterPlot-Desktop_Qt_5_0_2_MSVC2010_32bit-Debug\\numbers.txt'

Answer 2

I believe this answer here may be of help.

Essentially, your backslashes are causing issues.