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Sumana Harihareswara 2020-07-28 10:16:58 -04:00
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docs/html/user_guide.rst
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@ -1054,20 +1054,20 @@ logic, and easier for you to use and troubleshoot.
The most significant changes to the resolver are: The most significant changes to the resolver are:
* It will **reduce inconsistency**: it will *no longer install a * It will **reduce inconsistency**: it will *no longer install a
combination of packages that is mutually inconsistent*. In older combination of packages that is mutually inconsistent*. In older
versions of pip, it is possible for pip to install a package which versions of pip, it is possible for pip to install a package which
does not satisfy the declared requirements of another installed does not satisfy the declared requirements of another installed
package. For example, in pip 20.0, ``pip install "six<1.12" package. For example, in pip 20.0, ``pip install "six<1.12"
"virtualenv==20.0.2"`` does the wrong thing, “successfully” installing "virtualenv==20.0.2"`` does the wrong thing, “successfully” installing
``six==1.11``, even though ``virtualenv==20.0.2`` requires ``six==1.11``, even though ``virtualenv==20.0.2`` requires
``six>=1.12.0,<2`` (`defined here ``six>=1.12.0,<2`` (`defined here
<https://github.com/pypa/virtualenv/blob/20.0.2/setup.cfg#L42-L50>`__). <https://github.com/pypa/virtualenv/blob/20.0.2/setup.cfg#L42-L50>`__).
The new resolver, instead, outright rejects installing anything The new resolver, instead, outright rejects installing anything if it
if it gets that input. gets that input.
* It will be **stricter** - if you ask pip to install two packages with * It will be **stricter** - if you ask pip to install two packages with
incompatible requirements, it will refuse (rather than installing a incompatible requirements, it will refuse (rather than installing a
broken combination, like it did in previous versions). broken combination, like it did in previous versions).
So, if you have been using workarounds to force pip to deal with So, if you have been using workarounds to force pip to deal with
incompatible or inconsistent requirements combinations, now's a good incompatible or inconsistent requirements combinations, now's a good