While pythons are generally not considered dangerous to humans, there are a few species that can pose a risk due to their large size and strength. Here are a few examples:

1. Burmese Python (Python bivittatus): The Burmese python is one of the largest snake species in the world and can reach lengths of over 20 feet (6 meters). While not venomous, their size and strength make them capable of causing harm if mishandled or if they feel threatened. They have been known to constrict and injure humans in certain cases.

2. African Rock Python (Python sebae): African rock pythons are also large and powerful snakes, with some individuals exceeding 20 feet (6 meters) in length. They have a reputation for being aggressive when cornered or provoked, and their bites and constrictions can cause significant injury or even be fatal to humans.

3. Reticulated Python (Python reticulatus): Reticulated pythons are known for their remarkable length, with some individuals reaching lengths of over 25 feet (7.6 meters). While they are generally shy and elusive, they have been involved in occasional attacks on humans, often as a result of being cornered or mistaken for prey.

It’s important to note that incidents involving human injuries from pythons are relatively rare and often occur due to human interaction, such as keeping them as pets without proper precautions or attempting to handle them without expertise. With responsible handling and respect for their natural behaviors, the risks associated with pythons can be minimized.