找出机器上大于100MB的文件，并按照文件大小倒序排列

import os
def find_files(directory):
    for dirpath, _, filenames in os.walk(directory):
        for filename in filenames:
            yield os.path.join(dirpath, filename)

def find_files_greater_than(min_size):
    for file in find_files("/"):
        if os.path.getsize(file) > min_size:
            yield file, os.path.getsize(file)

if __name__ == "__main__":
    min_size = 100*1024*1024
    for file, size in sorted(find_files_greater_than(min_size), key=lambda f: f[1]):
        print(file, size)