String Methods Guide

Here are a few useful string methods that work on string objects in Python. For a full list of string methods refer to the Python reference here: Python Reference String

1. count():
   • Description: Returns the number of times a specified value occurs in a string.
   • Example:

     text = "hello world"
     count = text.count("l")
     print(count)  # Outputs: 3
     

2. find():
   • Description: Searches the string for a specified value and returns the position of where it was found. If the value is not found, it returns -1.
   • Example:

     text = "hello world"
     position = text.find("world")
     print(position)  # Outputs: 6
     

3. isalpha():
   • Description: Returns True if all characters in the string are alphabetic (i.e., letters of the alphabet) and there is at least one character; otherwise, False.
   • Example:

     text = "Hello"
     result = text.isalpha()
     print(result)  # Outputs: True
     

4. isnumeric():
   • Description: Returns True if all characters in the string are numeric characters, and there is at least one character; otherwise, False.
   • Example:

     number = "12345"
     result = number.isnumeric()
     print(result)  # Outputs: True
     

5. lower():
   • Description: Converts all uppercase characters in a string to lowercase.
   • Example:

     text = "HELLO WORLD"
     lower_text = text.lower()
     print(lower_text)  # Outputs: "hello world"
     

6. strip():
   • Description: Returns a trimmed version of the string, removing both leading and trailing whitespace (and other characters, if specified).
   • Example:

     text = "   hello world   "
     stripped_text = text.strip()
     print(stripped_text)  # Outputs: "hello world"
     

7. upper():
   • Description: Converts all lowercase characters in a string to uppercase.
   • Example:

     text = "hello world"
     upper_text = text.upper()
     print(upper_text)  # Outputs: "HELLO WORLD"