Installing cPickle with python 3.5

Question

With Python 3.5 docker image, I couldn't able to install cPickle.

Dockerfile

FROM python:3.5-onbuild

requirements.txt

cpickle

When I tried to construct the image

$ docker build -t sample .

Sending build context to Docker daemon 3.072 kB

Step 1 : FROM python:3.5-onbuild

# Executing 3 build triggers...

Step 1 : COPY requirements.txt /usr/src/app/

Step 1 : RUN pip install --no-cache-dir -r requirements.txt

 ---> Running in 016c35a032ee

Collecting cpickle (from -r requirements.txt (line 1))

  Could not find a version that satisfies the requirement cpickle (from -r requirements.txt (line 1)) (from versions: )

No matching distribution found for cpickle (from -r requirements.txt (line 1))

You are using pip version 7.1.2, however version 8.1.1 is available.

You should consider upgrading via the 'pip install --upgrade pip' command.

The command '/bin/sh -c pip install --no-cache-dir -r requirements.txt' returned a non-zero code: 1

Answer 1

In python 2.x, cPickle comes with std library. But, In case of Python 3.x, You need to do this if you want cPickle:

>>> import _pickle as cPickle

But, In python 3.x, it is easier just to use pickle. It is a bug if anything need cPickle in python 3.x

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