How to read pickle file

Question

I created some data and stored it several times like this   with open  filename    a   as f          pickle dump data  f    Every time the size of file increased  but when I open file  with open  filename    rb   as f      x   pickle load f    I can see only data from the last time   How can I correctly read file

User · Answer

There is a read pickle function as part of pandas 0 22   import pandas as pd  object   pd read pickle r filepath

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The following is an example of how you might write and read a pickle file  Note that if you keep appending pickle data to the file  you will need to continue reading from the file until you find what you want or an exception is generated by reaching the end of the file  That is what the last function does   import os import pickle   PICKLE FILE    pickle dat    def main          append data to the pickle file     add to pickle PICKLE FILE  123      add to pickle PICKLE FILE   Hello       add to pickle PICKLE FILE  None      add to pickle PICKLE FILE  b World       add to pickle PICKLE FILE  456 789        load  amp  show all stored objects     for item in read from pickle PICKLE FILE           print repr item       os remove PICKLE FILE    def add to pickle path  item       with open path   ab   as file          pickle dump item  file  pickle HIGHEST PROTOCOL    def read from pickle path       with open path   rb   as file          try              while True                  yield pickle load file          except EOFError              pass   if   name         main         main

User · Answer

Pickle serializes a single object at a time  and reads back a single object -  the pickled data is recorded in sequence on the file   If you simply do pickle load you should be reading the first object serialized into the file  not the last one as you ve written    After unserializing the first object  the file-pointer is at the beggining of the next object - if you simply call pickle load again  it will read that next object - do that until the end of the file   objects      with  open  myfile    rb    as openfile      while True          try              objects append pickle load openfile           except EOFError              break

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I developed a software tool that opens  most  Pickle files directly in your browser  nothing is transferred so it s 100  private     https   pickleviewer com

[python] How to read pickle file?

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