I've never encountered a Python installation on any operating system where `import sqlite3` worked but the underlying libraries were not available.
I imagine this is because SQLite is VERY easy to bundle with Python itself. So on some platforms the OS SQLite is used, but on others it gets shipped as part of the Python installation itself.
+1 I also think it's faster that way on both environment setup and ad hoc rapid experiments, from my experience using the library in a team doesn't scale well, it becomes pretty slow.