What does a dot after an integer mean in python?

Question

I am looking at this line of python code (which seems to run properly):

import numpy as np
yl = 300 + 63*np.exp(-x/35.)

What is the dot doi

Answer 1

It tells python to treat 3 as a float(). Its just a convenient way to make a number a float for division purposes then having to explicitly call float() on it.

For example:

my_float = 3.

typed_float = float(3)

my_float == typed_float
#=> True

type(my_float)
#=> 

In this case you need to typecast to a float to avoid the pitfalls of integer division.