Compatibility Policy

Semantic Versioning

PyMongo’s version numbers follow semantic versioning: each version number is structured “major.minor.patch”. Patch releases fix bugs, minor releases add features (and may fix bugs), and major releases include API changes that break backwards compatibility (and may add features and fix bugs).


Before we remove a feature in a major release, PyMongo’s maintainers make an effort to release at least one minor version that deprecates it. We add “DEPRECATED” to the feature’s documentation, and update the code to raise a DeprecationWarning. You can ensure your code is future-proof by running your code with the latest PyMongo release and looking for DeprecationWarnings.

The interpreter silences DeprecationWarnings by default. For example, the following code uses the deprecated insert method but does not raise any warning:

# "" (with PyMongo 3.X)
from pymongo import MongoClient

client = MongoClient()

To print deprecation warnings to stderr, run python with “-Wd”:

$ python3 -Wd DeprecationWarning: insert is deprecated. Use insert_one or insert_many instead.

You can turn warnings into exceptions with “python -We”:

$ python3 -We
Traceback (most recent call last):
  File "", line 4, in <module>
  File "/home/durin/work/mongo-python-driver/pymongo/", line 2906, in insert
    "instead.", DeprecationWarning, stacklevel=2)
DeprecationWarning: insert is deprecated. Use insert_one or insert_many instead.

If your own code’s test suite passes with “python -We” then it uses no deprecated PyMongo features.

See also

The Python documentation on the warnings module, and the -W command line option.