decimal value in python, how to make it '0.00'?

Question

I have problem in generating or getting decimal value in python. for now, I am using float(), but it returns .0 not .00 ...

>>> d = 10
>>> float(d)
10.0
>>> 

how can I set a decimal value that returns with .00?

>>10.00

thanks in advance ...

Answer 1

Python only displays what's needed, so it displated 10.0

If it's the matter of printing it as 10.00.

To do that.

>>> d = 10
>>> print "Value: %.2f" % float(d)
Value: 10.00
>>> 

Answer 2

You could also use format as follows:

>>> '{0:.2f}'.format(float(d))
10.00

Answer 3

If you want your arithmetic to take into account how many digits after the period you should have, you must use the decimal module:

>>> from decimal import Decimal
>>> Decimal("10.0")
Decimal('10.0')
>>> Decimal("10.00")
Decimal('10.00')
>>> Decimal("10.0")**2
Decimal('100.00')
>>> Decimal("10.00")**2
Decimal('100.0000')

I guess I also should mention the python uncertainties module:

>>> from uncertainties import ufloat
>>> x = ufloat((2, 0.25))
>>> x
2.0+/-0.25
>>> square = x**2  # Transparent calculations
>>> square
4.0+/-1.0

Answer 4

Python is displaying 10.0 because you're displaying a floating point number, and Python will only display as many decimal places as is needed.

If you want to print 10.00 for display purposes, use the string formatting operator % like so:

>>> a = 10
>>> float (a)
10.0
>>> "%2.2f" % a
'10.00'
>>> 

More about string formatting operations.