How to get random Decimal number from range? [duplicate]

Question

I'm looking for a way how to generate random Decimal number within some range. For example -

>>> random.choice(range(Decimal(1.55,3.89)))

>>> 1.89

Is it possible to do that with random? I want to preserve 2 decimal places.

random.choice(range(Decimal(1.55,3.89))) 

returns >>> 0

Answer 1

You can use random.randrange() like this:

import random
import decimal

decimal.Decimal(random.randrange(155, 389))/100

And then use float() to get your desired output:

>>> float(decimal.Decimal(random.randrange(155, 389))/100)
3.14
>>> float(decimal.Decimal(random.randrange(155, 389))/100)
1.91

As mentioned by @jsbueno in the comment, you can use generated numbers in formatted strings without converting them to floats:

>>> '{}'.format(decimal.Decimal(random.randrange(155, 389))/100)
'3.85'

You may need to use just float() like below:

>>> float(random.randrange(155, 389))/100
2.38
>>> float(random.randrange(155, 389))/100
3.72

Note:

In random.randrange(155, 389), 155 is included in the range, but 389 is not, if you want to include 389, you should use random.randrange(155, 390). This is mentioned by @mhawke in the comments below.