Karen Jackson, 41, of Blyth, England, said her daughter saw the snake inside the oven about two hours after the appliance had been used to cook a pizza, The Mirror reported Thursday.
Jackson said the animal, later identified as a royal python, apparently hid in a cool spot toward the back of the gas oven while it was in use and emerged after the cooker cooled down.
"Everything was fine and we used it [the oven] every day without any problems," Jackson said. "Then I heard my daughter scream. I ran to the oven and saw this snake slithering around. We just stood there in shock."
A friend who keeps snakes was able to catch the python with a coat hanger, Jackson said.
Jackson said she contacted the person who had recently sold them the oven and discovered the snake, named Lilly, belonged to the man's stepdaughter.