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add hint for using constraint file to prevent unwanted updates #74

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Mar 21, 2020
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add hint for using constraint file to prevent unwanted updates #74

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22 changes: 22 additions & 0 deletions README.rst
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Expand Up @@ -39,6 +39,28 @@ Example, run interactively, ask to upgrade for each package:

Run ``pip-review -h`` for a complete overview of the options.

Note: If you want to pin specific packages to prevent them from automatically
being upgraded, you can use a constraint file (similar to ``requirements.txt``):

.. code:: console

$ export PIP_CONSTRAINT="${HOME}/constraints.txt
$ cat $PIP_CONSTRAINT
pyarrow==0.14.1
pandas<0.24.0

$ pip-review --auto
...

Set this variable in ``.bashrc`` or ``.zshenv`` to make it persistent.
Alternatively, this option can be specified in ``pip.conf``, e.g.:

.. code:: console

$ cat ~/.config/pip.conf
[global]
constraint = /home/username/constraints.txt

Since version 0.5, you can also invoke pip-review as ``python -m pip_review``. This can be useful if you are using multiple versions of Python next to each other.

Before version 1.0, ``pip-review`` had its own logic for finding package updates instead of relying on ``pip list --outdated``.
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