random_state.py

#!/usr/bin/env python


import random
import os
import cPickle as pickle

if os.path.exists('state.dat'):
    # Restore the previously saved state
    print 'Found state,dat, initializing random module'
    with open('state.dat', 'rb') as f:
        state = pickle.load(f)
    random.setstate(state)
else:
    # Use a well-known start state
    print 'No state.dat, seeding'
    random.seed(1)

# Produce random values
for i in xrange(3):
    print '%04.3f' % random.random(),
print

# Save the state for next time
with open('state.dat', 'wb') as f:
    pickle.dump(random.getstate(), f)

# Produce more random values
print '\nAfter saving state:'
for i in xrange(3):
    print '%04.3f' % random.random()
print