I am using Python's (v2.4) profile module to profile a numpy script, and the following entry appears to account for the bulk of the execution time:

ncalls  tottime  percall  cumtime  percall filename:lineno(function)
 256/1    0.000    0.000    7.710    7.710 <string>:1(?)

Unfortunately, its appearance makes it hard to Google.

How do I go about figuring out what this is exactly?

edit The profiler is run from the shell as follows: python -m profile -s cumulative script.py

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