24671488710

Ran 20 Apr 2026 02:19PM UTC

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Build # 24671488710

Build Type

push

github

Committed by

iskandr

Commit Message

Defer PyVCF3 import to avoid rpy2/R init on every import varcode

Plain `import varcode` was eating hundreds of milliseconds of R init
whenever rpy2 happened to live in the environment. The chain:

    varcode/__init__.py: from .vcf import load_vcf, load_vcf_fast
      varcode/vcf.py:    import vcf as pyvcf  (PyVCF3)
        vcf/filters.py:  try: from rpy2 import robjects

PyVCF3 unconditionally probes rpy2 at module top level, which fully
boots R. Fix: drop the eager `from .vcf import ...` in the package
__init__, and add a PEP 562 __getattr__ so `varcode.load_vcf`,
`from varcode import load_vcf`, and `varcode.load_vcf_fast` still
resolve — they just pay the cost on first access instead of at
import time.

Net effect: `python -c "import varcode"` is silent and fast again.
Regression covered by tests/test_lazy_vcf_import.py — spawns a fresh
subprocess and asserts that varcode.vcf is absent from sys.modules
until an attribute access triggers it.

Closes #302. Unblocks topiary#122.
Bumps to 4.0.6.

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