Python API

pykep_rust is the typed, collision-safe Python interface to the native pykep-core implementation. It covers foundations, epochs and anomalies, element conversion, two-body propagation and STMs, mission-design utilities, Lambert problems, ephemerides, evaluated dynamics, and low-thrust legs.

import pykep_rust as pk

assert pk.jd_to_mjd2000(2_451_544.5) == 0.0
assert pk.cross([1.0, 0.0, 0.0], [0.0, 1.0, 0.0]) == [0.0, 0.0, 1.0]
epoch = pk.Epoch.from_iso("2030-01")
assert epoch.to_iso() == "2030-01-01T00:00:00.000000"
eccentric = pk.mean_to_eccentric_anomaly(0.1, 0.5)
assert abs(pk.eccentric_to_mean_anomaly(eccentric, 0.5) - 0.1) < 1e-15
state = pk.classical_to_cartesian([7e6, 0.01, 0.4, 1.0, 0.5, 0.2], 3.986004418e14)
earth = pk.Planet.jpl_low_precision("earth")
earth_state = earth.state(0.0)

Angles are radians and Julian conversions are arithmetic day counts without an implied UTC, TT, or TDB time scale. Public numerical functions reject NaN and infinity. Sequence batch functions preserve order, release the GIL around native work, and do not create a thread pool. Numeric Epoch arithmetic uses days; add_seconds() and seconds_since() make second-based arithmetic explicit. Constructor data is copied into immutable native objects.

The wheel ships a py.typed marker and complete extension stub. The full units, shape, default, ownership, and error contract is in docs/python-api.md. Users moving from kep3 should read docs/python-migration.md; no partial legacy-name facade is installed.

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