3. Determining variable type with type()

>> a=7
>>> type(a)
<class 'int'>

>>> b=7.7
>>> type(b)
<class 'float'>

>>> c="hello"
>>> type(c)
<class 'str'>

>>> d=[1,2,3]
>>> type(d)
<class 'list'>

>>> e=(1,2,3)
>>> type(e)
<class 'tuple'>

>>> f={1:"one",2:"two"}
>>> type(f)
<class 'dict'>

>>> g={1,2,3}
>>> type(g)
<class 'set'>

>>> i=True
>>> type(i)
<class 'bool'>





You can check what type of object is assigned to a variable using Python's built-in type() function. Common data types include:

int (for integer)
float
str (for string)
list
tuple
dict (for dictionary)
set
bool (for Boolean True/False)

@python_codes

4. String Basics

>>> s='python_codes'
>>> s
'python_codes'

>>> len(s)
12

>>> s[0]
'p'

>>> s[1:]
'ython_codes'

>>> s
'python_codes'

>>> s[:7]
'python_'

>>> s[:]
'python_codes'

>>> s[::1]
'python_codes'

>>> s[::-1]
'sedoc_nohtyp'

>>> var = "a"
>>> var*10
'aaaaaaaaaa'

>>> s=s+" python channel"
>>> s
'python_codes python channel'

>>> s.upper()
'PYTHON_CODES PYTHON CHANNEL'

>>> s.lower()
'python_codes python channel'

>>> s.split('codes')
['python_', ' python channel']

@python_codes

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