🛠 String Methods

Last Updated: 10th August 2025

String Method means a inbuilt tools that are used to perform operations on strings. Some of them are:

  • len() – Built-in Function (Not a Method),Returns the number of characters in a string (including spaces).
text = "Python"
print(len(text))  # 6
  • strip() – Remove spaces from both ends,i.e start and end of the string.
text = "   Python   "
print(text.strip())  # Python
  • lstrip() – Remove spaces from left
text = "   Python   "
print(text.lstrip())  # Python   (Left Space Removed)
  • rstrip() – Remove spaces from right
text = "   Python   "
print(text.rstrip())  #   Python (Right Space Removed)
  • upper() – Converts a string to upper case.
text = "python"
print(text.upper())  # PYTHON
  • lower() – Converts a string to lower case.
text = "PYTHON"
print(text.lower())  # python
  • capitalize() – Converts the first character to upper case.
text = "python is fun"
print(text.capitalize())  # Python is fun
  • title() – Converts the first character of each word to upper case.
text = "python is fun"
print(text.title())  # Python Is Fun
  • swapcase() – Converts upper case characters to lower case and vice versa.
text = "PYTHON is Fun"
print(text.swapcase())  # python IS fUN
  • isalnum() – Returns True if all characters in the string are alphanumeric (a-z, A-Z and 0-9).
text = "Python"
print(text.isalnum())  # True
  • isalpha() – Returns True if all characters in the string are alphabetic (a-z and A-Z).
text = "Python"
print(text.isalpha())  # True
  • isdigit() – Returns True if all characters in the string are digits (0-9).
text = "123"
print(text.isdigit())  # True
  • islower() – Returns True if all characters in the string are lower case.
text = "python"
print(text.islower())  # True
  • isupper() – Returns True if all characters in the string are upper case.
text = "PYTHON"
print(text.isupper())  # True
  • isspace() – Returns True if all characters in the string are spaces.
text = "   "
print(text.isspace())  # True
  • startswith() – Returns True if the string starts with the specified characters.
text = "Python"
print(text.startswith("Py"))  # True
  • endswith() – Returns True if the string ends with the specified characters.
text = "Python"
print(text.endswith("on"))  # True
  • replace() – Returns a string where a specified value is replaced with a specified value.
text = "Python"
print(text.replace("Python", "Java"))  # Java
  • find() – Return first index of substring (or -1 if not found)
text = "banana"
print("banana".find("na"))  # 2
  • rfind() – Return last index of substring (or -1 if not found)
text = "banana"
print("banana".rfind("na"))  # 4
  • count() – Count occurrences of substring
text = "banana"
print("banana".count("na"))  # 2
  • zfill() – Add leading zeros to make string a given length
print("42".zfill(5))  # 00042
  • center() – Return a centered string
print("Python".center(10, "*"))  # **Python**
  • partition() – Split into tuple (before, separator, after)
print("Hello World".partition(" "))  # ('Hello', ' ', 'World')
  • rpartition() – Partition from the right
print("Hello World Python".rpartition(" "))
# ('Hello World', ' ', 'Python')
  • removesuffix() – Remove suffix from string
print("Hello World".removesuffix("World"))  # Hello
  • removeprefix() – Remove prefix from string
print("Hello World".removeprefix("Hello"))  # World
  • split() – Convert string to list
text = "apple,banana,cherry"
print(text.split(","))
# ['apple', 'banana', 'cherry']

Hinglish Tip 🗣: String methods ka use kar ke hum text ko modify, check, format, ya manipulate kar sakte hain. len() method nahi, ek built-in function hai jo har type (string, list, tuple) ka size batata hai.

💡 Quick Practice

  1. Take " Hello World " and remove spaces from both ends.
  2. Convert "python programming" to title case.
  3. Replace "Java" with "Python" in "I like Java".
  4. Check if "12345" is a digit-only string.
  5. Count how many times "is" appears in "This is Python and it is fun"
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