python tutorial - 3 step by step full course 2019

Variables and Data Types
Variables are the nouns of a programming language: they are the entities (values, data) that act or are acted upon. The character-counting program uses two variables--count and args. The program increments count each time it reads a character from the input source and ignores args.

Boolean values;
Signed and unsigned integers;
Real, imaginary, and complex floating point values; and
Strings.
These types, along with the void type (not covered in this section), are known as Chapel's primitive types. In previous sections, we've seen simple uses of string and integer types and values.

Floating Point Numbers
Why floating-point numbers are needed
Since computer memory is limited, you cannot store numbers with infinite precision, no matter whether you use binary fractions or decimal ones: at some point, you have to cut off. But how much accuracy is needed? And where is it needed? How many integer digits and how many fraction digits?

integer

Posted by: Margaret Rouse
WhatIs.com


An integer (pronounced IN-tuh-jer) is a whole number (not a fractional number) that can be positive, negative, or zero.

Examples of integers are: -5, 1, 5, 8, 97, and 3,043.

Examples of numbers that are not integers are: -1.43, 1 3/4, 3.14, .09, and 5,643.1.

The set of integers, denoted Z, is formally defined as follows:

Z = {..., -3, -2, -1, 0, 1, 2, 3, ...}

In mathematical equations, unknown or unspecified integers are represented by lowercase, italicized letters from the "late middle" of the alphabet. The most common are p, q, r, and s.