Lecture 72:-  String Operations Part(2) In Python

Continuing from the previous string operations, here are some more commonly used string operations in Python:

1. Removing Whitespace: You can remove leading and trailing whitespace from a string using the strip(), lstrip(), and rstrip() methods.

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string = "   Hello, World!   " print(string.strip())    # Output: "Hello, World!" print(string.lstrip())   # Output: "Hello, World!   " print(string.rstrip())   # Output: "   Hello, World!"

1. String Splitting and Joining: The split() method splits a string into a list of substrings based on a delimiter. The join() method joins a list of strings into a single string using a specified delimiter.

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string = "apple,banana,orange" fruits_list = string.split(",") print(fruits_list)   # Output: ['apple', 'banana', 'orange'] fruits = ["apple", "banana", "orange"] fruits_string = ",".join(fruits) print(fruits_string)   # Output: "apple,banana,orange"

1. Finding Substrings and Counting Occurrences: The find() method finds the index of the first occurrence of a substring. If the substring is not found, it returns -1. The count() method counts the number of occurrences of a substring in a string.

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string = "Hello, Hello, World!" print(string.find("Hello"))   # Output: 0 print(string.find("Python"))  # Output: -1 print(string.count("Hello"))  # Output: 2

1. String Formatting with str.format(): The str.format() method allows you to format strings with placeholders and replacement fields.

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name = "Alice" age = 30 formatted_string = "My name is {} and I am {} years old.".format(name, age) print(formatted_string)   # Output: "My name is Alice and I am 30 years old."

1. String Reversal: You can reverse a string using slicing.

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string = "Hello, World!" reversed_string = string[::-1] print(reversed_string)   # Output: "!dlroW ,olleH"

1. Checking String Types: Python provides several methods to check if a string has a specific type of characters.

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text = "Hello123" print(text.isalpha())   # Output: False (Contains digits) print(text.isdigit())   # Output: False (Contains alphabetic characters) print(text.isalnum())   # Output: True (Contains only alphabetic characters and digits) print(text.islower())   # Output: False (Not all characters are lowercase) print(text.isupper())   # Output: False (Not all characters are uppercase)

These are some additional string operations that can be very useful when working with strings in Python. Python's built-in string methods provide a wide range of functionalities, making string processing efficient and straightforward.