How to format a float

When returning a float sometimes you want it to format as a revenue number.

revenue = round(revenue, 2)
# 308716.98

But what if I wanted 308,716

We can use revenue:,.0f the special bit is:

:,.0f

f states that revenue is a float number, and you want to control its format.
.0 states that you want 0 positions after .
, says that you want , for thousands
:- is a seperator between your variable name and formatting controllers