import os
import hashlib

# 计算文件的md5sum
def md5sum(fname):
    hash_md5 = hashlib.md5()
    with open(fname, "rb") as f:
        for chunk in iter(lambda: f.read(4096), b""):
            hash_md5.update(chunk)
    return hash_md5.hexdigest()

# 获取全部文件后缀名
def get_suffix_and_filelist(path):
    sfx=[]
    fls=[]
    for p,ds,fs in os.walk(path):
        for f in fs:
            fn = os.path.join(p,f)
            fls.append(fn)
            sf = os.path.splitext(fn)[1]
            if sf not in sfx:
                sfx.append(sf)
    return sfx,fls

# 文件后缀，文件列表
path = "your/pathname/"
suffix,flists = get_suffix_and_filelist(path)

with open(os.path.join(path,"checksumAll.txt"),"w") as fr:
    for fl in flists:
        if os.path.splitext(fl)[1] in ['.jpg', '.png', '.MOV', '.JPG', '.PNG', '.GIF']:
            fn = fl
            fmd = md5sum(fl)
            print("%s:%s" %(fn,fmd))
            fr.write(fn + ":" + fmd + "\n")
        else :
            print(fl + " not in list")