5. Lists

>>> list=[8,0,5,1]
>>> list
[8, 0, 5, 1]

>>> len(list)
4

>>> list_2=['string',8086,'p']
>>> list_2
['string', 8086, 'p']

>>> len(list_2)
3

Indexing and Slicing

>>> list=['one','ox','ok']
>>> list[0]
'one'

>>> list[1:]
['ox', 'ok']

>>> list[:2]
['one', 'ox']

>>> list[-1]
'ok'

>>> list[::-1]
['ok', 'ox', 'one']

>>> list+[235]
['one', 'ox', 'ok', 235]

>>> list*2
['one', 'ox', 'ok', 'one', 'ox', 'ok']

Basic List Methods

>>> list=[4,0,1,3]
>>> list.append("new")
>>> list
[4, 0, 1, 3, 'new']

>>> list.pop(0)
4
>>> list
[0, 1, 3, 'new']

>>> list.reverse()
>>> list
['new', 3, 1, 0]


Nesting Lists

>>> lst_1=[1,2,3]
>>> lst_2=[4,5,6]
>>> lst_3=[7,8,9]
>>> matrix = [lst_1,lst_2,lst_3]
>>> matrix
[[1, 2, 3], [4, 5, 6], [7, 8, 9]]

>>> matrix[1]
[4, 5, 6]

>>> matrix[0][1]
2

@python_codes

6. Conditionals

example

x = 5

if x == 5:
print("x equals 5")
else:
print("x does not equal 5")

it will output

x equals 5

🍏 other operators

x = 6
if x > 5:
print("x greater than 5")
else:
print("x less than 5")

outputs

x greater than 5

other operators

< less than
!= not equal to
>= greater equal to
<= less equal to

smart python

if 3<x<5:

means if x between 3 and 5

@python_codes

# ASCII
p=ord("A")
q=ord('a')
print(p,q)

output: 65 97

@python_codes