Basic Python

 #this is first printing

print("hello")

#to know type/int/float/str/bool

type(11)

type(11.09)

type('lucknow')

type(True)

#changing type

float(30)

int(2.8)

int(1)

#expression and variables

#operations and operand

print(38+38+28+24)

print(26/5)

print(30//4)

#variables is used to store values

my_age=29

print(my_age)

#string operations

#string choose value from '0' and can be negative/ last elememt will be[-1]

#slicing [0:4],[0:6] where 4&6 will not be included

#stride-[::2]-it means selection of every second value

my_name='Bhagat Singh'

my_name[0:5]

my_name[::3]

my_name[2:7:2]#it means it will select every second value upto 6th element

len(my_name)

new_name='Sardar ' +my_name

print(new_name)

#int*str will replicate the no.of time str

3*my_name

#escape sequences '\' e.g.\n for new line,\t for tab

print("my name is \n Bhagat Singh")

#strings method

my_name="Bhagat Singh"

my_name.upper()

my_name.lower()

new_name=my_name.replace('Bhagat','Ajit')

print(new_name)

my_name.find('at')

my_name.find('Singh')

#regex for strings tool in python by import re

#search,split,findfall,sub

my_name.split()#split into list

import re

s1='My name is Bhagat singh'

pattern=r'Bhagat'

result= re.search(pattern, s1)

if result:

    print("match found")

else:

    print("match not found")

pattern=r'\d\d\d\d\d\d\d\d\d'

text='My phone nuber is 1234567890'

match= re.search(pattern, text)

if match:

    print('phone no. found:', match.group())

else:

    print("no match")

    

pattern=r'\w'

text1='my name is Bhagat Singh'

matches=re.findall('is', text1)

print('Matches:', matches)

d	Matches any digit character (0-9)	"123" matches "\d\d\d"
\D	Matches any non-digit character	"hello" matches "\D\D\D\D\D"
\w	Matches any word character (a-z, A-Z, 0-9, and _)	"hello_world" matches "\w\w\w\w\w\w\w\w\w"
\W	Matches any non-word character	"@#$%" matches "\W\W\W\W"
\s	Matches any whitespace character (space, tab, newline, etc.)	"hello world" matches "\w\s\w\w\w\w\w"
\S	Matches any non-whitespace character	"hello_world" matches "\S\S\S\S\S\S\S\S\S"
\b	Matches the boundary between a word character and a non-word character	"cat" matches "\bcat\b" in "The cat sat on the mat"
\B	Matches any position that is not a word boundary	"cat" matches "\Bcat\B" in "category" but not in "The cat sat on the mat"