Lesson 1. Introduction in Python

#PYTHON 

#INTRODUCTION IN PYTHON

#aRithmetic operators

#data types #conversion of types

#built-in functions #variables

Arithmetic operators

· Addition: +

· Subtraction: -

· Multiplication: *

· Division: /

· Floor division: //

· Modulus: %

· Exponent: **

Data types

· Integer numbers – int: …, -5, -4, -3, -2, -1, 0, 1, …

· Floating-point numbers – float: …, -1.1, 5.16, 3e-10, …

· String – str: …, «S», «LINUX», «3ABoP», «Hello, World!», …

· Boolean type – bool: False, True

· Nothing – NoneType: None

Conversion of types

· int to float

in [1]: float(1)

out [1]: 1.0

· float to int

in [2]: int(5.7)

out [2]: 5

· float to str

in [3]: str(54.4)

out [3]: 54.4

· str to float

in [4]: float(54.4)

out [4]: 54.4

· str to float

in [5]: float(NO)

out [5]: ValueError

Built-in functions

· help()

- if you need some help - use help() !

· input()

- built-in function input() – basic input for simple data.

· print()

- built-in function print() – basic output for data.

Variables

name_of_variable = value_of_variable

· First advice: register is important!

· Second advice: use more informative names of variables.

a = 8

b = 15.0

B = 7

abba = False

letter = C

path = C:\Users\my_folder\second_folder\

list_of_temperature = [37.8, 38.3, 38.5, 37.0]