Find files from one directory tree that aren't in another

FindMissingFiles.py

import os

sourcedir = "h:\\D\\video"
destdir = "d:\\video"

def getfilelist(dirname):
    filelist = {}
    count = 0
    for root, dirs, files in os.walk(dirname):
        for file in files:
            #filelist.append(os.path.join(root, file).replace(dirname + '\\', ""))
            filelist[file] = os.path.join(root, file).replace(dirname + '\\', '')
            count += 1
    print(str(count))
    return filelist

sourcefiles = getfilelist(sourcedir)
destfiles = getfilelist(destdir)
print(str(len(sourcefiles)) + " files found in " + sourcedir)
print(str(len(destfiles)) + " files found in " + destdir)

for file in sourcefiles:
    if file not in destfiles:
        #print(file + " at " + sourcefiles[file])
        #print("copy " + sourcedir.replace("\\", "\") + "\\" + sourcefiles[file] + ' d:\\video\\missing\\')
        print("copy /z \"" + sourcedir + "\\" + sourcefiles[file] + "\" " + "\"" + destdir + "\"")