Assertion or assert may refer to: Assertion (software development), a computer programming technique. assert.h, a header file in the standard library of the C programming language. Assertion definition language, a specification language providing a formal grammar to specify behaviour and interfaces for computer software.
Grass snakes prey mainly on amphibians, especially the common toad and the common frog, although they may also occasionally eat ants and larvae. Captive snakes have been observed taking earthworms offered by hand, but dead prey items are never taken.
You need to specify. Rough and smooth green snakes, which are common in the U.S., eat insects. In captivity, they'll eat calcium dusted crickets. They don't eat the foods you named. Green tree pythons eat rodents and birds, not the foods you mentioned.