Printing File Names

Right now, you search each character string inside of testdir's variable.

so it's searching the folder for values "C", ":", "\", "T" etc. You'll want to also escape your escape character like "C:\...\...\"

You probably was to use os.listdir(testdir) instead.

Try running your Python script from C:. From the Command Prompt, you might wanna do this:

> cd C:\    
> python C:\Users\pcuser\EricDocs\Test.py

As pointed out by Tony Babarino, use r"C:\Test" instead of "C:\Test" in your code.

Use the glob module.

The glob module finds all the pathnames matching a specified pattern

import glob, os
parent_dir = 'path/to/dir'
for pdf_file in glob.glob(os.path.join(parent_dir, '*.pdf')):
    print (pdf_file)

This will work on Windows and *nix platforms.

Just make sure that your path is fully escaped on windows, could be useful to use a raw string.

In your case, that would be:

import glob, os
parent_dir = r"C:\Test"
for pdf_file in glob.glob(os.path.join(parent_dir, '*.pdf')):
    print (pdf_file)

For only a list of filenames (not full paths, as per your comment) you can do this one-liner:

results = [os.path.basename(f) for f in glob.glob(os.path.join(parent_dir, '*.pdf')]

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