People often use the term strongly-typed language to refer to a language that is both statically typed (types are associated with a variable declaration -- or, more generally, the compiler can tell which type a variable refers to, for example through type inference, without executing the program) and strongly-typed (restrictive about how types can be intermingled). So, if you look at dynamic typing and strong-typing as orthogonal concepts, Python can be both dynamically and strongly typed.
See [http://en.wikipedia.org/wiki/Strongly-typed_programming_language Strongly Typed Programming Language] for more details.