问找到large_files，但输出意外结果

EN

import os, time, shelve
start = time.time()
root = '/'
# errors= set()
# dirs = set()
while True:
    try:
        root = os.path.abspath(root) #ensure its a abspath
        #set the baseline as 100M 
        #consider the shift
        baseline = 100 * 2**20  # 2*20 is1M
        #setup to collect the large files
        large_files = []

        #root is a better choise as the a concept
        for foldername, subfolders, files in os.walk(root):
            for f in files:
                # print(f"{foldername}, {f}")
                abspath = os.path.join(foldername, f)
                size = os.path.getsize(abspath)
                if size >= baseline:
                    large_files.append((os.path.basename(abspath), size))
                    print(abspath, size/(2**20))

        #write the large files to shelf
        shelf = shelve.open('/root/large_files.db')
        shelf["large_files"] = large_files
        shelf.close()

        if subfolders == []:
            end = time.time()
            break

    except (PermissionError,FileNotFoundError) as e:
        # errors.add(e)
        pass

[root@iz2ze9wve43n2nyuvmsfx5z ~]# python3 search_large_files.py 
/dev/core 134217726.0078125
/dev/core 134217726.0078125
/dev/core 134217726.0078125
....

 print(abspath, size/(2**20))