decimal_context_manager.py

#!/usr/bin/env python


import decimal

with decimal.localcontext() as c:
    c.prec = 2
    print 'Local precision:', c.prec
    print '3.14 / 3 =', (decimal.Decimal('3.14') / 3)

print
print 'Default precision:', decimal.getcontext().prec
print '3.14 / 3 =', (decimal.Decimal('3.14') / 3)