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Python BasicsPython Basics11
❯

  1. 1Introduction to Python
  2. 2Python Hello World Program
  3. 3Python Comments Explained - Beginner’s Guide with Examples
  4. 4Python Variables
  5. 5Python Constants
  6. 6Python Data Types
  7. 7Python Strings
  8. 8Python Type Conversions
  9. 9Python Basic Input and Output - Learn to Take User Input and Print Output
  10. 10Python Operators
  11. 11Python Operator Precedence – Evaluation Order with Examples

Python Flow ControlPython Flow Control5
❯

  1. 1Python Conditional Statements
  2. 2Python Loops
  3. 3Python For Loop
  4. 4Python While Loop
  5. 5Python Break and Continue

Python CollectionsPython Collections5
❯

  1. 1Introduction to Python Collections
  2. 2Python Lists
  3. 3Python Dictionaries
  4. 4Python Tuples
  5. 5Python Sets

Python FunctionsPython Functions4
❯

  1. 1Python Functions
  2. 2Python Functions with Parameters
  3. 3Python main() Function
  4. 4Python Lambda Functions

Python File HandlingPython File Handling1
❯

  1. 1Python File Operations – Read, Write, Update & Delete Files

Python Exception HandlingPython Exception Handling3
❯

  1. 1What Are Python Exceptions?
  2. 2Python Exception Handling
  3. 3Python Custom Exceptions

Python OOPsPython OOPs5
❯

  1. 1Python Object-Oriented Programming
  2. 2Python Inheritance
  3. 3Python Multiple Inheritance
  4. 4Python Encapsulation
  5. 5Python Polymorphism

Python Advanced ConceptsPython Advanced Concepts5
❯

  1. 1Python List Comprehension
  2. 2Python Iterators
  3. 3Python Generators
  4. 4Python Closures
  5. 5Python Decorators

Python LibrariesPython Libraries3
❯

  1. 1Python Email Tutorial
  2. 2Python JSON Tutorial – Parse, Read, Write & Handle JSON in Python
  3. 3Python datetime Tutorial - Working with Dates and Times in Python

Python ReferencePython Reference2
❯

  1. 1Python Built-in Functions
  2. 3Python String Methods

Python Built-in FunctionsPython Built-in Functions0
❯

    Python String MethodsPython String Methods0
    ❯

      ProgramGuru

      Python String zfill() Method – Pad String with Zeros

      Python String zfill() Method

      The zfill() method in Python is used to pad a numeric string with leading zeros, so that the resulting string reaches a specified length. It's especially useful when formatting numbers like invoice IDs, codes, or timestamps.

      Syntax

      string.zfill(width)

      Parameter:

      • width – The total length of the resulting string (including leading zeros).

      Returns:

      • A copy of the string left-padded with zeros to make it at least width characters long.

      Example 1: Simple Zero Padding

      text = "42"
print(text.zfill(5))
      00042

      Example 2: zfill() with Negative Numbers

      text = "-42"
print(text.zfill(5))
      -0042

      Note: The negative sign is preserved in its original position.

      Example 3: No Padding if Already Long Enough

      text = "12345"
print(text.zfill(4))
      12345

      The string remains unchanged because its length is already more than the specified width.

      Use Cases

      • Formatting IDs with fixed length (e.g., invoice IDs like INV000123)
      • Preparing data for export to systems that require zero-padded numbers
      • Display time values like 05 instead of 5

      Common Mistakes

      • Using zfill() on non-string types like integers will raise an error. Convert to string first.
      • Confusing zfill() with rjust() or ljust() which pad with spaces by default.

      Interview Tip

      zfill() is handy in problems requiring fixed-width formatting or normalization of numeric string data before comparison.

      Summary

      • zfill() pads the string on the left with 0s until it reaches the specified length.
      • It preserves the sign position for negative numbers.
      • Only works on string types — use str() on numbers before calling zfill().

      Practice Problem

      Write a program that asks the user for a number and prints it as a 6-digit zero-padded string.

      user_input = input("Enter a number: ")
print("Padded Number:", user_input.zfill(6))

      Python String Methods❯

      1. 1Python String capitalize() – Capitalize First Letter of a String
      2. 2Python String casefold() – Case-Insensitive String Comparison
      3. 3Python String center() Method – Center Align a String with Padding
      4. 4Python String count() Method – Count Substring Occurrences
      5. 5Python string.encode() – Convert String to Bytes
      6. 6Python String endswith() – Check if a String Ends with Substring
      7. 7Python String expandtabs() – Replace Tabs with Spaces
      8. 8Python String find() – How to Locate Substrings Easily
      9. 9Python String index() Method – Find Position of a Substring
      10. 10Python String isalnum() Method – Check Alphanumeric Strings
      11. 11Python String isalpha() Method – Check for Alphabetic Characters
      12. 12Python String isascii() Method – Check for ASCII Characters
      13. 13Python String isdecimal() Method – Check if All Characters Are Decimals
      14. 14Python String isdigit() Method – Check If a String Has Only Digits
      15. 15Python String isidentifier() – Check for Valid Identifiers
      16. 16Python String islower() Method – Check for Lowercase Strings
      17. 17Python String isnumeric() Method – Check for Numeric Characters
      18. 18Python String isprintable() Method – Check Printable Characters
      19. 19Python String isspace() Method – Check for Whitespace Only
      20. 20Python String istitle() Method – Check for Title Case
      21. 21Python String isupper() Method – Check for Uppercase Letters
      22. 22Python String join() Method – Combine Strings Easily
      23. 23Python String ljust() Method – Left Justify a String with Spaces or Characters
      24. 24Python String lower() Method – Convert to Lowercase
      25. 25Python String lstrip() Method – Remove Leading Characters
      26. 26Python String maketrans() Method – Create Translation Tables
      27. 27Python String partition() Method – Split into Three Parts
      28. 28Python String replace() Method – Replace Substrings Easily
      29. 29Python String rfind() Method – Find Last Occurrence of Substring
      30. 30Python String rindex() Method – Find Last Occurrence of a Substring
      31. 31Python String rjust() Method – Right Justify a String
      32. 32Python String rpartition() Method – Split String from the Right
      33. 33Python String rsplit() Method – Split from the Right
      34. 34Python String rstrip() Method – Remove Trailing Characters
      35. 35Python String split() Method – Split Strings Easily
      36. 36Python String splitlines() Method – Split String by Line Breaks
      37. 37Python String startswith() Method – Check If a String Starts With
      38. 38Python String strip() Method – Remove Spaces from Ends
      39. 39Python String swapcase() Method – Convert Uppercase to Lowercase and Vice Versa
      40. 40Python String title() Method – Convert to Title Case
      41. 41Python String translate() Method – Replace Characters Using Mapping
      42. 42Python String upper() Method – Convert to Uppercase
      43. 43Python String zfill() Method – Pad String with Zeros

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