Concatenation of Two or More Strings

#Sample Code
s1 = "Hello "
s2 = "Anand "

#concatenation of 2 strings
print(s1 + s2)

#repeat string n times
print(s2 * 3)

Output:
Hello Anand 
Anand Anand Anand 

ord() and chr() Functions

# ord() – function returns the ASCII code of the character.
ch = 'b'
print(ord(ch))

Output:
98

# chr() – function returns character represented by a ASCII number.
print(chr(97))
print(chr(65))
print(chr(98))

Output:
a
A
b

String Comparison

#Sample Code for String Comparison 

print("Python" == "Python")
print("PYTHON" == "Python")

print("PYTHON" != "Java")

print("Python" > "PYTHON")
print("Python" < "PYTHON")

print("Python" >= "PYTHON")
print("Python" <= "PYTHON")

Output:
True
False
True
True
False
True
False

String Membership Operator

# Sample Code for 'in' operator
Str1 = "All the best"
print('best' in Str1)

# Sample Code for 'not in' operator
str2 = "Happy Learning"
print('sad' not in str2)

Output:
True
True

Iterating String using for loop

# Program to print each character of a string
for x in "python":
    print(x)   
    
Output:
p
y
t
h
o
n

1. strip() method removes any whitespace from the beginning or the end

str1 = "    Welcome to Python Session "
print(str1) # Printing with Space
print(str1.strip()) # Printing without Space 

Output:
    Welcome to Python Session 
Welcome to Python Session

2. len() method returns the length of a string

str2 = "Python String Length"
print('Length of String is ',len(str2))

Output:
Length of String is  20

3. lower() method returns the string in lower case

str3 = "WELCOME"
print(str3.lower())  

Output:
welcome

4. islower() method check whether string is in lower case of not.

str4 = "welcome"
print(str4.islower())

Output:
True

5. upper() method returns the string in upper case

str5 = "welcome"
print(str5.upper())

Output:
WELCOME

6. isUpper() method check whether string is in upper case of not.

str6 = "WELCOME"
print(str6.isupper())

Output:
True

7. isalpha() method check Checks if All Characters are Alphabets

str9 = "Python"
str10 = "Python123"
str11 = "123"
str12 = "Python123@#@#"
print(str9.isalpha())
print(str10.isalpha())
print(str11.isalpha())
print(str12.isalpha())  

Output:
True
False
False
False

8. isdigit() method check whether string is Checks Digit Characters

str9 = "Python"
str10 = "Python123"
str11 = "123"
str12 = "Python123@#@#"
print(str9.isdigit())
print(str10.isdigit())
print(str11.isdigit())
print(str12.isdigit())

Output:
False
False
True
False

9. isalnum() method check whether string is Checks Alphanumeric Character

str9 = "Python"
str10 = "Python123"
str11 = "123"
str12 = "Python123@#@#"
print(str9.isalnum())
print(str10.isalnum())
print(str11.isalnum())
print(str12.isalnum())

Output:
True
True
True
False

10. count() method returns the number of occurrences of a substring in the given string.

string = "Python is easy to learn.This"
string = "Python is easy to learn. This is also called as easy programming language"
substring = "is"

count = string.count(substring)

# print count
print("The count is:", count)

Output:
The count is: 2

11. join() method returns a string concatenated with the elements of an iterable.

string1 = '-'
string2 = '123456'

print('string1.join(string2):', string1.join(string2))

Output:
string1.join(string2): 1-2-3-4-5-6

12. split() method breaks up a string at the specified separator and returns a list of strings.

# splits at space
str1= 'Welcome to Python Class'
print(str1.split())

# splits at ','
str2 = "Vinoth,Anand,Santhosh,Raghul"
# splits at ','
print(str2.split(','))

# splits at ':'
str3 = "121212121:1212121:21434322434:4234234"
print(str3.split(':'))

Output:
['Welcome', 'to', 'Python', 'Class']
['Vinoth', 'Anand', 'Santhosh', 'Raghul']
['121212121', '1212121', '21434322434', '4234234']

13. find() method returns the index of first occurrence of the substring (if found). '
If not found, it returns -1.

str = 'Do you like programming?'
print("Substring 'like' at index':", str.find('like'))

Output:
Substring 'like' at index': 7

14. replace() method returns a copy of the string where all occurrences of a substring is replaced with another substring.

# Character replacement
fruit = 'Appla'
print (fruit.replace('a', 'e'))

# String replacement
color = 'red, rose, greeen , yellow, rose'
print (color.replace('rose', 'blue'))

# The original string is unchanged
print ('Original string:', fruit)
print ('Replaced string:', fruit.replace('a', 'e'))

Output:
Apple
red, blue, greeen , yellow, blue
Original string: Appla
Replaced string: Apple

15. sorted() method returns a sorted list from the given iterable.

String = 'dzsewkitng'
print(sorted(String))

Output:
['d', 'e', 'g', 'i', 'k', 'n', 's', 't', 'w', 'z']

16. startswith() method returns True if a string starts with the specified prefix.
If not, it returns False.

text = "Python is easy to learn"
print(text.startswith("Python"))

Output:
True

17. endswith() method returns True if a string ends with the specified suffix.
If not, it returns False.

text = "Python is easy to learn"
print(text.endswith("learn"))

Output:
True