Measure directory size with Python

I am new to Python and I need to get the size from a directory with more than 500k files. I found some code on the internet which should be really fast. Somehow it doesnt work and I dont know why. The current output is only 'Test' so it doesnt even enter the function.

import time
import os

start_time = time.time()
print('Test')
def getSize(path):
    print('Test2')
    total = 0
    for entry in os.scandir(path):
        if entry.is_dir(follow_symlinks=False):
            total += getSize(entry.path)
        else:
            total += entry.stat(follow_symlinks=False).st_size
    return total

    print (float(getSize('U:\Java'))/1024/1024/1024)
    print("--- %s Sekunden ---" % round(time.time() - start_time, 2))

Additional question: Is there an even faster way to search such big directories with python or other languages?

The two last lines in your program, where you call the function, are indented and therefore considered a part of the function and will not execute. Simply dedent them.