Renaming PDF's | Python Fiddle

import arcpy
import os

def make_filename_dictionary(name_table):
    """
    Create a dictionary of filenames with newname and oldname.
    """
    with arcpy.da.SearchCursor(name_table, ['NAME_NEW', 'NAME_CUR']) as rows:
        filename_dictionary = dict()
        for row in rows:
            filename_dictionary[str(row[1])] = str(row[0])
    return filename_dictionary

def get_new_filename(oldfilename, filename_dictionary):
    """
    Use the old name to check for an updated name in the dictionary.
    """
    if oldfilename in  filename_dictionary.keys():
        print "Match found: {0}, {1}".format(oldfilename, filename_dictionary[oldfilename])
        return filename_dictionary[oldfilename]
    print "Name not found: {0}".format(oldfilename)
    return False

def rename_files(directory, name_table):
    """
    Rename the files in the input directory.
    """
    new_file_names = make_filename_dictionary(name_table)
    old_files = [fi for fi in os.listdir(directory) if os.path.splitext(fi)[1] == ".pdf"]
    for f in old_files:
        new_file_name = get_new_filename(f, new_file_names)
        if new_file_name:
            old_file_path = os.path.join(directory, f)
            new_file_path = os.path.join(directory, new_file_name)
            os.rename(old_file_path, new_file_path)

if __name__ == '__main__':
    d = # directory with pdf's
    n = # table with old names and new names
    rename_files(d, n)

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