# Dependency conflict error messages

Updates after feedback from @pradyunsg and @uranusjr

Note: It is not _currently_ possible to display the dependency tree, but pip does know the _parent_ of the conflicting package (or if no parent exists)

Accordingly, we should update the messages to be:

## Conflict caused by dependencies

ERROR: Cannot install package_1 and package_2 because these package
versions have conflicting dependencies.

The conflict is caused by:
    package_1 2.3 requires package_3>2.0
    package_2 1.0 requires package_3<2.0

To fix this you could try to:
- loosen the range of package versions you've specified
- remove package versions to allow pip to attempt to solve the
dependency conflict
- ask the package maintainers to loosen their dependencies

ERROR: ResolutionImpossible For help visit: https://pip.pypa.io/en/st
able/user_guide/#dependency-conflicts-resolution-impossible

## Conflict includes top level requirement

ERROR: Cannot install package_2 and package_3 because these package
versions have conflicting dependencies.

The conflict is caused by:

    package_2 1.0 requires package_3<2.0
    package_3>2.0 is required by you

To fix this you could try to:
- loosen the range of package versions you've specified
- remove package versions to allow pip to attempt to solve the
dependency conflict
- ask the package maintainers to loosen their dependencies

ERROR: ResolutionImpossible For help visit: https://pip.pypa.io/en/st
able/user_guide/#dependency-conflicts-resolution-impossible

## Package conflicting with itself

ERROR: Cannot install package_1 because of conflicting dependencies.

The conflict is caused by:
    package_1 requires package_3<2.0
    package_1 requires package_3>2.0

To fix this you could try to:
- ask the package maintainers to fix the conflict

ERROR: ResolutionImpossible For help visit: https://pip.pypa.io/en/st
able/user_guide/#dependency-conflicts-resolution-impossible