Formatting floats

[volcano63]

For year 5 I need it to format to the 12th decimal place. I have tried reading the documentation, but it isn't working.
I need str(yearFiveTest) to express to 12 decimals.

The moment you applied str conversion, you made formatting options irrelevant (actually, illegal). The purpose of formatting is to facilitate conversion to string according to specification

Output:
In [2]: '{:.12f}'.format(0.56456454646)
Out[2]: '0.564564546460'

In [3]: '{:.12f}'.format(str(0.56456454646))
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-3-2e1f324cded6> in <module>()
----> 1 '{:.12f}'.format(str(0.56456454646))

ValueError: Unknown format code 'f' for object of type 'str'

Someone will tel you about formatting post, but if you want to develop Python - I strongly suggest to follow PEP-8 conventions