> with environment variable you get more information.

For timing package import time, such as for idlelib.pyshell, rather than bare python startup time, the extra information is just a bit more noise to ignore.

The importtime output is sent to stderr.  Should this be documented?  It is important because displaying results immediately on command prompt rather than redirecting to a file adds about .07 seconds to the total time reported for pyshell, whether I use debug or normal binaries.  The relative variation between repeated runs (about 1%) also seems less with redirection to a file.