variable_en.md

📃 README 📝 Exercises

2- VARIABLES and DATA TYPES

Defining a variable

In Python, variables are created when they are defined for the first time. You can store text, numbers or more complex structures. It is recommended that the name of the variable be related to what is going to be stored in it. They cannot start with any number.

greeting1= "Good morning" # (this is a comment in Python, we will use the symbol: # and then the text)

Reserved words in Python

They cannot be used to name variables:

and	as	assert	async	await	break
continue	def	del	elif	else	except
false	finally	for	from	global	if
import	in	is	lambda	none	nonlocal
not	or	pass	raise	return	true
try	while	with	yield

We will start with the types that exist,

(Although we will delve into each of them later)

Guy. Strings (str) or Strings ""

They are text enclosed in quotes (single or double) and accept operators.

They are immutable

string1 = "double quotes"
string2 = 'single quotes'

a = "Good"
b = "days!"
sumStrings = a + " " + b
print (sumStrings)

Type. Booleans

It can only admit True or False. Used in conditions and loops, which we will see later. True/False

a = 5
print(a==5) # We are telling it to print the condition of that equality on the screen and it will return:
true

Type. Numbers

Integers:

They are the Numbers that lack decimals int (integer) or long (long integer for more precision).

age = 25

Real:

They are numbers that have decimals and are of type float.

length = 25,638

Complexes:

Numbers that have a real part and an imaginary part. These numbers are called complex.

n = 3.8 + 9j

Type. Sets {}

Collection of data without repeated elements, unordered and separated by commas, enclosed in braces.

set = {'house', 'tree', 'dog',356,'dumpling',-89,'mango', 'cheese'}

Type. Lists [ ]

They are ordered sets of elements that can store numbers, strings, other lists... They are placed between ([ ]) and the elements are separated by commas.

list1 = ['17',-66,99,44,"bye", 'hello',6,7,"8",9,10,11,12,13]
list2 = list1[0:8:2] # We take from list1 from position 0 to 8 and from 2 2n 2; and we put it in the list2
print(list2)
['17', 99, 'goodbye', 6] 

Type. Tuples ()

It is an immutable list

tuple1 = ("bird",34,"9",clock)

Type. Dictionaries { : }

We can store any type of value such as integers, strings, lists and even other functions. And we can identify each element by a key (Key).

dictionary1 = {'car': 'Mercedes', 'Color': 'red', 'speed': 280 }
print (dictionary1['car']) # By entering the key "car" we will get "Mercedes"