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When I run following script:
def uncalled():
 x = b'x' * (2**32)
print('Hello')
Python 3.4 consumes huge memory in spite of uncalled() function isn't called.
$ /usr/bin/time -l /usr/local/bin/python2 constant_folding.py
Hello
 0.02 real 0.01 user 0.00 sys
 4337664 maximum resident set size
$ /usr/bin/time -l /usr/local/bin/python3 constant_folding.py
Hello
 2.76 real 1.36 user 1.39 sys
4300234752 maximum resident set size
Both of Python 2.7.6 and Python 3.4.0 is built with Homebrew.