Why am I unable to show the precision of a float value using quantiphy and engfmt?

Question

I'm working on an engineering calculator in python and I found some packages that can convert a float value to engineering notation. First I installed engfmt:

Code:

from engfmt import to_eng_fmt

num = -327.2051
num = to_eng_fmt(num, prec=4)
print(num)

Output:

-327.21

The second package that I installed is quantiphy because it is a new release and serves the same purpose as the engfmt :

Code:

from quantiphy import Quantity

num = -327.2051
num = Quantity(num).fixed(prec=4)
print(num)

Output:

-327.21

What I want is to show the precision decimal value upto 4 places. like this -327.2051

Version:

• Python == 3.7.9
• quantiphy == 2.12.0
• engfmt == 0.2.0 (I cant install the version 1.1.0 because it gives me an error. This version only works for me)