Is a ball python a boa constrictor?

No. Boas, pythons, and anacondas are all part of the same family (Boidae), but the various species belong to many different genera.

Boa Constrictor Scientific Classification.

Kingdom: Animalia

Phylum: Chordata

Subphylum: Vertebrata

Class: Reptilia

Order: Squamata

Suborder: Serpentes

Family: Boidae

Subfamily: Boinae

Genus: Boa

Species: Constrictor imperator

Anacondas Scientific classification.

Kingdom: Animalia

Phylum: Chordata

Subphylum: Vertebrata

Class: Reptilia

Order: Squamata

Suborder: Serpentes

Family: Boidae

Subfamily: Boinae

Genus: Eunectes

Anaconda Species: (4)

Bolivian: Eunectes beniensis

Dark-spotted: Eunectes deschauenseei

Green: Eunectes murinus

Yellow: Eunectes notaeus

Python Scientific classification.

Kingdom: Animalia.

Phylum: Chordata.

Subphylum: Vertebrata.

Class: Reptilia.

Order: Squamata.

Suborder: Serpentes.

Infraorder: Alethinophidia.

Family: Pythonidae.

Genus: Python.

Species: P. molurus