Python 3 - Second Edition

11.5    Floats: float

We mentioned floats briefly earlier. Now we’d like to describe in them in greater detail. To store a float with limited precision,[ 38 ] you can use the float data type.

As discussed previously, the literal for a float in the simplest case looks like this:

v = 3.141  

The parts before and after the period can be omitted if they have the value 0:

>>> -3. -3.0>>> .0010.001  

Note here that the period is an essential element of a float literal and as such must not be omitted.

Since Python 3.6, an underscore can also be used to group the digits of a float literal:

>>> 3.000_000_13.0000001  

11.5.1    Exponential Notation

Python also supports a notation that allows you to use the exponential notation:

v = 3.141e-12  

A lowercase ...