Using pickle dump - TypeError must be str not bytes

Question

I m using python3 3 and I m having a cryptic error when trying to pickle a simple dictionary    Here is the code   import os import pickle from pickle import   os chdir  c  Python26 progfiles     def storvars vdict             f   open  varstor txt   w       pickle dump vdict f       f close       return  mydict     name   john   gender   male   age   45   storvars mydict    and I get   Traceback  most recent call last     File  C  Python26 test18 py   line 31  in  lt module gt      storvars mydict    File  C  Python26 test18 py   line 14  in storvars     pickle dump vdict f   TypeError  must be str  not bytes

User · Answer

The output file needs to be opened in binary mode   f   open  varstor txt   w     needs to be   f   open  varstor txt   wb

User · Answer

Just had same issue   In Python 3  Binary modes  wb    rb  must be specified whereas in Python 2x   they are not needed   When you follow tutorials that are based on Python 2x   that s why you are here    import pickle  class MyUser object       def   init   self name           self name   name  user   MyUser  Peter    print  Before serialization     print user name  print  ------------   serialized   pickle dumps user  filename    serialized native   with open filename  wb   as file object      file object write serialized   with open filename  rb   as file object      raw data   file object read    deserialized   pickle loads raw data    print  Loading from serialized file     user2   deserialized print user2 name  print  ------------

[python] Using pickle.dump - TypeError: must be str, not bytes

Examples related to python

Examples related to python-3.x

Examples related to pickle