Getting milliseconds in Python

[mjs7231]

"Return the time as a floating point number expressed in seconds since
the epoch, in UTC. Note that even though the time is always returned as
a floating point number, not all systems provide time with a better
precision than 1 second. While this function normally returns
non-decreasing values, it can return a lower value than a previous call
if the system clock has been set back between the two calls. "

This is no good, I am looking for milliseconds, not seconds.. as stated
above.