md5哈希值错误

Question

我已经输入了计算md5的散列值的代码，我希望当用户单击按钮时返回散列值。但是，当我单击按钮时，出现错误"TypeError: coercing to Unicode: need string or buffer，function found“。我尝试将散列值转换为字符串，但没有解决问题。

def openfile():
filename = askopenfilename(parent=root)
f = open(filename)
f.read()
print (filename)

def hashmd5():
md5 = hashlib.md5()
with open(openfile, "rb") as f:
for block in iter(lambda: f.read(128), ""):
md5.update(block)
print (m.hexdigest)

def helloCallBack():
tkMessageBox.showinfo("Calculate MD5")
B = Button(text ="Calculate MD5", command = hashmd5)
B.pack()

更新：

def openfile():
filename = askopenfilename(parent=root)
f = open(filename)
f.read()
print (filename)

def savefile(self):
filename = tkFileDialog.asksaveasfilename(**self.file_opt)
if filename:
return open(filename, 'w')

def hashmd5():
md5 = hashlib.md5()
with (filename), "rb") as f:
for block in iter(lambda: openfile.read(128), ""):
 md5.update(block)
 print (md5.hexdigest)

Answer 1

错误："NameError:全局名称' filename‘未定义“是因为您没有在def hashmd5()函数中定义filename，因此需要使用self.filename才能使用filename变量

Answer 2

openfile后缺少圆括号。但是打开文件两次有什么意义呢？( openfile和hashmd5?)