String Functions in Python

String Functions in Python:

    Python has a variety of built-in string methods. The number of string methods in Python can vary depending on the version of Python you are using, but here are some commonly used string methods in Python:

1. str.upper(): Converts a string to uppercase.
• Example:
• >>> text = "Testing Colleges"
• >>> print(text.upper())
• >>> output: TESTING COLLEGES
2. str.lower(): Converts a string to lowercase.
• Example:
• >>> text = "Testing Colleges"
• >>> print(text.lower())
• >>> output: testing colleges
3. str.capitalize(): Capitalizes the first letter of the string.
• Example:
• >>> text = "testing Colleges blogger"
• >>> print(text.capitalize())
• output: Testing colleges blogger
4. str.title(): Capitalizes the first character of each word in the string.
• Example:
• text = "testing Colleges blogger"
• >>> print(text.title())
• output: Testing Colleges Blogger
5. str.strip(): Removes leading and trailing whitespace.
• Example:
• >>> text = "   Testing Colleges   "
• >>> print(text.strip())
• >>> output: "Testing Colleges"
6. str.lstrip(): Removes leading whitespace.
• Example:
• >>> text = "   Testing Colleges   "
• >>> print(text.lstrip())
• >>> output: "Testing Colleges   "
7. str.rstrip(): Removes trailing whitespace.
• Example:
• >>> text = "   Testing Colleges   "
• >>> print(text.rstrip())
• >>> output: "   Testing Colleges"
8. str.replace(old, new): Replaces occurrences of the "old" substring with the "new" substring.
• Example:
• >>> text = "I love Java"
• >>> new_text = text.replace("Java", "Python")
• >>> print(new_text)
• output: "I love Python"
9. str.split(separator): Splits a string into a list of substrings based on the specified separator.
• Example:
• >>> text = "Testing Colleges"
• >>> print(text.split("e"))
• output: ['T', 'sting Coll', 'g', 's']
10. str.join(iterable): Joins the elements of an iterable (e.g., a list) into a single string using the specified separator.
• Example:
• >>> l = ['apple', 'banana', 'mango']
• >>> text = ', '.join(l)
• >>> print(text)
• output: "apple, banana, mango"
11. str.startswith(prefix): Checks if the string starts with the specified prefix.
• Example:
• >>> text = "Testing Colleges"
• >>> s = text.startswith("Testing")
• >>> print(s)
• output: True
12. str.endswith(suffix): Checks if the string ends with the specified suffix.
• Example:
• >>> text = "Testing Colleges"
• >>> s = text.endswith("Colleges")
• >>> print(s)
• output: True
13. str.find(substring): Searches for the first occurrence of a substring and returns its index.
• Example:
• >>> text = "Testing Colleges"
• >>> n = text.find("Colleges")
• >>> print(n)
• output: 8
14. str.rfind(substring): Searches for the last occurrence of a substring and returns its index.
• Example:
• >>> text = "Testing Colleges"
• >>> print(text.rfind("e"))
• output: 14
15. str.index(substring): Similar to find(), but raises an exception if the substring is not found.
• Example:
• >>> text = "Testing Colleges"
• >>> print(text.find("a"))
• >>> output: -1
• >>> print(text.index("a"))
• >>> output: ValueError: substring not found
16. str.count(substring): Counts the number of non-overlapping occurrences of a substring.
• Example:
• >>> text = "Peter Piper picked a peck of pickled peppers."
• >>> n = text.count("peck")
• >>> print(n)
• output: 1
17. str.isalpha(): Checks if all characters in the string are alphabetic.
• Example:
• >>> text = "Testing Colleges"
• >>> text2 = "TestingColleges"
• >>> print(text.isalpha())
• output: False
• >>> print(text2.isalpha())
• output: True
18. str.isnumeric(): Checks if all characters in the string are numeric.
• Example:
• >>> text = "12345"
• >>> print(text.isnumeric)
• output: True
19. str.isalnum(): Checks if all characters in the string are alphanumeric.
• Example:
• >>> text = "1a2345"
• >>> print(text.isalnum())
• output: True
20. str.isdigit(): Checks if all characters in the string are digits.
• Example:
• >>> print("1234".isdigit())   # True
• >>> print("123.456".isdigit())   # False
• >>> print("1,234,567".isdigit())   # False
• >>> print("".isdigit())   # False
• -----------------------------------
• >>> print("1234".isnumeric())   # True
• >>> print("123.456".isnumeric())   # True
• >>> print("1,234,567".isnumeric())   # True
• >>> print("".isnumeric())   # False
21. str.islower(): Checks if all characters in the string are lowercase letters.
• Example:
• >>> text = "testing colleges"
• >>> print(text.islower())
• output: True
22. str.isupper(): Checks if all characters in the string are uppercase letters.
• Example:
• >>> text = "TESTING COLLEGES"
• >>> print(text.isupper())
• output: True

These are just a few of the many string methods available in Python. You can explore more string methods and their usage in the Python documentation:

https://docs.python.org/3/library/stdtypes.html#string-methods