Unexpected floating-point representations in Python

Question

Hello I am using a dictionary in Python storing some cities and their population like that:

population = { \'Shanghai\' : 17.8, \'Istanbul\' : 13.3, \'Karach         


        

Answer 1

You have to use decimal.Decimal if you want to have the decimal represented exactly as you specified it on any machine in the world.

See the Python manual for information: http://docs.python.org/library/decimal.html

>>> from decimal import Decimal
>>> print Decimal('3.14')
3.14