pickle Archives - IT Nursery

Multiprocessing: How to use Pool.map on a function defined in a class?

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When I run something like: from multiprocessing import Pool p = Pool(5) def f(x): return x*x p.map(f, [1,2,3]) it works fine. However, putting … Read more

Can’t pickle when using multiprocessing Pool.map()

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I’m trying to use multiprocessing‘s Pool.map() function to divide out work simultaneously. When I use the following code, it works fine: import multiprocessing … Read more

Serializing class instance to JSON

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I am trying to create a JSON string representation of a class instance and having difficulty. Let’s say the class is built like … Read more

Storing Python dictionaries

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I’m used to bringing data in and out of Python using CSV files, but there are obvious challenges to this. Are there simple … Read more

Using pickle.dump – TypeError: must be str, not bytes

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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 … Read more

Saving an Object (Data persistence)

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I’ve created an object like this: company1.name=”banana” company1.value = 40 I would like to save this object. How can I do that? 5 … Read more

Python multiprocessing PicklingError: Can’t pickle

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I am sorry that I can’t reproduce the error with a simpler example, and my code is too complicated to post. If I … Read more

How can I use pickle to save a dict (or any other Python object)?

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I have looked through the information that the Python docs give, but I’m still a little confused. Could somebody post sample code that … Read more