Modify the ipython notebook error in Python

mimetypes.py

# Python27/Lib/mimetypes.py

# Line 248

# Original Line, comment the following lines

        def enum_types(mimedb):
            i = 0
            while True:
                try:
                    ctype = _winreg.EnumKey(mimedb, i)
                except EnvironmentError:
                    break
                # try:
                #     ctype = ctype.encode(default_encoding) # omit in 3.x!
                # except UnicodeEncodeError:
                #     pass
                else:
                    yield ctype
                i += 1