primer3-py
Simple primer design and analysis
Decision gist · record as of 2026-08-14
Yes, if you need fast oligo thermodynamic analysis or primer design in Python for research or open-source projects. The GPLv2 license is a hard blocker for proprietary software. Install friction is moderate due to compiled bindings, but pre-built wheels for common platforms and Python versions make setup straightforward. No known vulnerabilities and active maintenance support the choice.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.8 or later; compiled wheels available for macOS, Linux, and Windows but may require a C compiler on unsupported platforms.
- Medium install friction due to compiled C/Cython bindings, but wheels are pre-built for common platforms (macOS, Linux, Windows) across Python 3.8–3.14.
- Repository is actively maintained with recent commits and no archived status.
License · maintenance · safety
GPLv2 (copyleft) — GPLv2 copyleft license requires derivative works and distributions to be licensed under GPLv2 and source made available; suitable for research and open-source projects but may conflict with proprietary software licensing.
last release 2026-01-06 (220 days) · last repo commit 2026-07-22 · 193 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 435,399 downloads/mo, #6,679 on PyPI
Alternatives
Verify before relying
pip install primer3-py
import primer3
tm = primer3.calc_tm('GTAAAACGACGGCCAGT')
print(tm) # 49.16808228911765
result = primer3.calc_hairpin('CCCCCATCCGATCAGGGGG')
print(result.tm) # 34.15- Whether the Primer3 design engine bindings are production-ready or primarily for research use given the disclaimer about contacting the Primer3 dev team for support.
- Performance characteristics and memory overhead for large-scale batch oligo analysis compared to the ~1000X speedup claim over subprocess wrappers.
What it is and what it does
primer3-py is a Python wrapper around the Primer3 library, a widely-used tool for PCR primer design and oligo analysis. It provides direct access to thermodynamic calculations—such as melting temperature (Tm) and hairpin structure formation—through a simple Python API, avoiding the overhead of subprocess calls. The package includes bindings to Primer3's full design engine for automated primer selection pipelines.
The core appeal is speed: routine oligo analysis runs roughly 1000X faster than traditional subprocess-based wrappers. It supports modern Python versions (3.8–3.14) and is distributed as pre-compiled wheels for common platforms, minimizing installation friction. The package is actively maintained and documented, though users are directed to the upstream Primer3 team for design-engine-specific questions.
Use it for
- Calculate melting temperature and secondary structure stability for DNA sequences in high-throughput screening or assay design workflows.
- Batch validate primer pairs for PCR experiments by computing thermodynamic properties without spawning external processes.
- Integrate primer design into automated laboratory pipelines using Primer3's design engine with Python parameter control.
- Analyze oligonucleotide libraries for off-target binding risk by computing hairpin formation across many sequences.
- Prototype and benchmark primer selection algorithms that depend on fast, repeated Tm and structure calculations.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you need fast oligo thermodynamic analysis or primer design in Python for research or open-source projects.
The GPLv2 license is a hard blocker for proprietary software. Install friction is moderate due to compiled bindings, but pre-built wheels for common platforms and Python versions make setup straightforward. No known vulnerabilities and active maintenance support the choice.
Install
primer3-py on PyPI
Before you install
Medium install friction due to compiled C/Cython bindings, but wheels are pre-built for common platforms (macOS, Linux, Windows) across Python 3.8–3.14. Repository is actively maintained with recent commits and no archived status.
Requires Python 3.8 or later; compiled wheels available for macOS, Linux, and Windows but may require a C compiler on unsupported platforms.
License in practice
GPLv2 copyleft license requires derivative works and distributions to be licensed under GPLv2 and source made available; suitable for research and open-source projects but may conflict with proprietary software licensing.
Quickstart
pip install primer3-py
import primer3
tm = primer3.calc_tm('GTAAAACGACGGCCAGT')
print(tm) # 49.16808228911765
result = primer3.calc_hairpin('CCCCCATCCGATCAGGGGG')
print(result.tm) # 34.15Verify before relying
- Whether the Primer3 design engine bindings are production-ready or primarily for research use given the disclaimer about contacting the Primer3 dev team for support.
- Performance characteristics and memory overhead for large-scale batch oligo analysis compared to the ~1000X speedup claim over subprocess wrappers.
Package facts
| License | GPLv2 copyleft |
| Python support | Supports the current Python release >=3.8 |
| Install friction | Medium. Platform-specific wheel |
| Runtime dependencies | None |
| Maintenance | Actively maintained 220 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 435,399 / month, #6,679 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 5 - Production/StableIntended Audience :: Science/ResearchLicense :: OSI Approved :: GNU General Public License v2 (GPLv2)Programming Language :: CProgramming Language :: CythonProgramming Language :: PythonProgramming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Programming Language :: Python :: 3.8Programming Language :: Python :: 3.9Topic :: Scientific/Engineering :: Bio-Informatics |
Evidence: primer3_py-2.3.0-cp310-cp310-macosx_10_14_x86_64.whl; primer3_py-2.3.0-cp310-cp310-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl; primer3_py-2.3.0-cp310-cp310-win_amd64.whl; primer3_py-2.3.0-cp311-cp311-macosx_10_14_x86_64.whl; primer3_py-2.3.0-cp311-cp311-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl; primer3_py-2.3.0-cp311-cp311-win_amd64.whl; primer3_py-2.3.0-cp312-cp312-macosx_10_14_x86_64.whl; primer3_py-2.3.0-cp312-cp312-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl; primer3_py-2.3.0-cp312-cp312-win_amd64.whl; primer3_py-2.3.0-cp313-cp313-macosx_10_14_x86_64.whl; primer3_py-2.3.0-cp313-cp313-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl; primer3_py-2.3.0-cp313-cp313-win_amd64.whl; primer3_py-2.3.0-cp314-cp314-macosx_10_15_x86_64.whl; primer3_py-2.3.0-cp314-cp314-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl; primer3_py-2.3.0-cp314-cp314t-macosx_10_15_x86_64.whl; primer3_py-2.3.0-cp314-cp314t-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl; primer3_py-2.3.0-cp314-cp314t-win_amd64.whl; primer3_py-2.3.0-cp314-cp314-win_amd64.whl; primer3_py-2.3.0-cp38-cp38-macosx_10_14_x86_64.whl; primer3_py-2.3.0-cp38-cp38-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl
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