philiprehberger-import-profiler 0.1.9

Show how long each Python import takes during startup

philiprehberger-import-profiler

Show how long each Python import takes during startup.

Installation

pip install philiprehberger-import-profiler

Usage

Basic Profiling

from philiprehberger_import_profiler import profile_imports

report = profile_imports("my_package")

# Slowest imports
for entry in report.slowest(10):
    print(f"{entry.name}: {entry.duration_ms:.1f}ms")

# Tree view
report.print_tree(threshold_ms=5.0)
# └── my_package (124.5ms)
#     ├── requests (45.2ms)
#     │   └── urllib3 (22.1ms)
#     └── numpy (62.0ms)

# Summary
print(f"Total: {report.total_ms:.1f}ms, Modules: {report.module_count}")

Self Time and Export

report = profile_imports("my_package")

# Self time excludes children's duration
for entry in report.slowest(5):
    print(f"{entry.name}: total={entry.duration_ms:.1f}ms self={entry.self_ms:.1f}ms")

# Export as list of dicts
data = report.to_dict()
# [{"name": "requests", "duration_ms": 45.2, "self_ms": 23.1, "parent": "my_package"}, ...]

API

Function / Class	Description
profile_imports(module_name)	Profile all imports, returns ImportReport
report.slowest(n)	Top N slowest imports as ImportEntry list
report.print_tree(threshold_ms=0)	Print indented tree
report.total_ms	Total import time in milliseconds
report.module_count	Number of modules imported
report.to_dict()	Export as list of dicts
ImportEntry.name	Module name
ImportEntry.duration_ms	Total duration including children
ImportEntry.self_ms	Duration excluding children

Development

pip install -e .
python -m pytest tests/ -v

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License

MIT