2 # Global helper functions
3 def truncate(n, decimals=2):
4 """Truncate a float to a particular number of decimals."""
5 assert decimals > 0 and decimals < 10, "Decimals is weird"
6 multiplier = 10 ** decimals
7 return int(n * multiplier) / multiplier
9 def format_money(number):
10 """Format a monetary amount with a $ and comma thousands separators."""
11 return ("${:,}".format(truncate(number)))
13 def format_rate(rate):
14 """Format a multiplier nee rate to look nice."""
16 return format_rate(rate - 1.0)
18 return "{:<}%".format(round(rate * 100, 3))