Article: Four days after his birth, Apollo killed the chthonic dragon Python, which lived in Delphi beside the Castalian Spring. This was the spring which emitted vapors that caused the oracle at Delphi to give her prophecies. Hera sent the serpent to hunt Leto to her death across the world. To protect his mother, Apollo begged Hephaestus for a bow and arrows. After receiving them, Apollo cornered Python in the sacred cave at Delphi. Apollo killed Python but had to be punished for it, since Python was a child of Gaia.

Question: Where did Apollo kill Python?
the sacred cave at Delphi. Apollo