No.
Python was killed by Apollo for pursuing the pregnant Leto, or by Apollo for the Oracle of Delphi - half of it was his by a birthday gift of Phoebe, and half was under the Python's keeping for Poseidon. Apollo gave Calauriato Poseidon for his half of Delphi.
Leto is the Greek Titan goddess of motherhood.
Apollo was a Greek god because he was from Greek mythology and was the son of Zeus (a god) and Leto (a titan goddess).
Leto's mother is the Titan Phoebe. Her father is the Titan Coeus.
Apollo's mother is the Titan goddess Leto.
As the Python had hunted Leto during her pregnancy, so Apollo slayed the Python when he was still a young deity.
She was a Titan, not one of the main gods. Her importance was as mother of Apollo and Artemis. She was the Greek goddess of motherhood.
Apollo is not a Greek goddess; he is a Greek god, born of the Olympian god Zeus and the Titan born goddess Leto.
Phoebe had 2 children, Leto and Asteria by her brother, the Titan Coeus.
Leto; the mother of Apollo, did not die in Greek Myth being a Titan goddess.
Apollo was born a Greek god, his father being Zeus and his mother being Leto a Titan born goddess.
Yes; Leto the Greek goddess who was the daughter of Coeus and Phoebe, was the sister of Asteria who was mother of Hecate.
No: Leto is a Titan goddess, daughter of Coeus and Phoebe.