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title: custodian.qchem.md
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# custodian.qchem package

This package implements various QChem Jobs and Error Handlers.

## Subpackages

* [custodian.qchem.tests package]()
  ```none
    * [custodian.qchem.tests.test_handlers module](custodian.qchem.tests.test_handlers.md)


    * [custodian.qchem.tests.test_job_handler_interaction module](custodian.qchem.tests.test_job_handler_interaction.md)


    * [custodian.qchem.tests.test_jobs module](custodian.qchem.tests.test_jobs.md)
  ```
* [custodian.qchem.handlers module](custodian.qchem.handlers.md)
* [custodian.qchem.jobs module](custodian.qchem.jobs.md)
* [custodian.qchem.utils module](custodian.qchem.utils.md)
  * [`perturb_coordinates()`](custodian.qchem.utils.md#custodian.qchem.utils.perturb_coordinates)
  * [`vector_list_diff()`](custodian.qchem.utils.md#custodian.qchem.utils.vector_list_diff)