ImportError: cannot import name 'make_mpc' from 'mpmath'

TL;DR: your mpmath is too old for your sympy. sympy expects make_mpc, which only newer mpmath provides. Upgrade mpmath.

The error

ImportError: cannot import name 'make_mpc' from 'mpmath'

Fix it

1. Upgrade mpmath:

   pip install -U mpmath

   Expected: installs an mpmath new enough to provide make_mpc.

2. Verify:

   python -c "from mpmath import make_mpc; import sympy; print('ok')"

   Expected: prints ok.

When this applies

Use this when import sympy raises the make_mpc error, typical when mpmath was pinned or vendored separately from sympy.

When it does not apply

If mpmath is already current and the error persists, the mpmath install is corrupt; reinstall it. If the error names a different mpmath symbol, check the versions pair-wise.

Compatibility

sympy releases that require a newer mpmath than what is installed; make_mpc exists in mpmath 1.3+.

Root cause

sympy tracks mpmath's API and uses make_mpc for complex interval constructors. Partial packaging (vendoring one without the other) or a stale mpmath pin leaves sympy calling a name its mpmath never had.

Edge cases

Always upgrade sympy and mpmath as a pair; pip install -U sympy pulls the right mpmath automatically. In frozen/packaged apps, update both in the package manifest.

The discuss.python.org thread on partially packaging sympy (topic 64779) reports ImportError: cannot import name 'makempc' from 'mpmath' when the packaged sympy pulls in an older mpmath than it expects. The verified fix: makempc was added to mpmath in a newer release, so upgrading mpmath to a version that provides it (matching what the sympy release requires) resolved the import. Thread: https://discuss.python.org/t/importerror-when-partially-packaging-sympy/64779