python storing path names with forward vs backward

问题:

I have a procedure that os.walks a directory and its subdirectories to filter pdf files, separating out their names and corresponding pathnames. The issue I am having is that it will scan the topmost directory and print the appropriate filename e.g. G:/Books/Title.Pdf but the second it scans a subfolder e.g G:/Books/Sub Folder/Title.pdf it will print the following

G:/Books/Sub Folder\\Title.Pdf

(which is obviously an invalid path name). It will also add \\ to any subfolders within subfolders.

Below is the procedure:

def dicitonary_list():
    indexlist=[]        #holds all files in the given directory including subfolders
    pdf_filenames=[]    #holds list of all pdf filenames in indexlist
    pdf_dir_list = []   #holds path names to indvidual pdf files 

    for root, dirs,files in os.walk('G:/Books/'):
        for name in files:
            indexlist.append(root + name)
            if ".pdf" in name[-5:]:
                pdf_filenames.append(name)

    for files in indexlist:
        if ".pdf" in files[-5:]:
            pdf_dir_list.append(files)

    dictionary=dict(zip(pdf_filenames, pdf_dir_list))       #maps the pdf names to their directory address

I know it's something simple that I am missing but for love nor money can i see what it is. A fresh pair of eyes would help greatly!

回答1:

Forward slashes and backward slashes are both perfectly valid path separators in Python on Windows.

>>> import os
>>> os.getcwd()
'j:\\RpmV'
>>> os.path.exists('j:\\Rpmv\\make.py')
True
>>> os.path.exists('j:/rpmv/make.py')
True
>>> os.path.isfile('j:\\Rpmv/make.py')
True