The current version of PL/Python
functions as a trusted language only; access to the file system and
other local resources is disabled. Specifically,
PL/Python uses the Python restricted
execution environment, further restricts it to prevent the use of
the file open call, and allows only modules from a
specific list to be imported. Presently, that list includes:
array, bisect, binascii,
calendar, cmath, codecs,
errno, marshal, math, md5,
mpz, operator, pcre,
pickle, random, re, regex,
sre, sha, string, StringIO,
struct, time, whrandom, and
zlib.