Floats are a primitive data-type that describe floating point numbers.
Floating point numbers include a mantisse and a exponent of 2. An example:
In ther the 1.42 is the mantisse and the 7 is the exponent.
The range of this numbers are 64-Bit numbers (on a 64-Bit computer) with a maximum exponent of 127 - BIAS where the BIAS is 127 (by convention).
Note that in Python there does not exist floats with double precision (double).
To convert something into a float, type: