Python String Methods

Introduction

• 47 string methods in Python.
• Excluding dunder methods (e.g., __len__)

Common Methods

1. capitalize()
   • Capitalizes the first character.
2. casefold()
   • For caseless comparisons.

Less Common Methods

3. center(width, [fillchar])
   • Centers the string with optional fillchar.
4. count(substring)
   • Counts occurrences of substring.
5. encode([encoding[, errors]])
   • Encodes the string.
6. endswith(suffix[, start[, end]])
   • Checks if the string ends with suffix.
7. expandtabs([tabsize])
   • Expands tabs to spaces.
8. find(sub[, start[, end]])
   • Finds the first occurrence of sub.
9. **format(*args, kwargs)
   • Formats the string.
10. format_map(mapping)
    • Uses dictionary for formatting.

Methods for Character Type Checking

11. isalnum()
    • Checks if all characters are alphanumeric.
12. isalpha()
    • Checks if all characters are alphabetic.
13. isascii()
    • Checks if all characters are ASCII.
14. isdecimal()
    • Checks if all characters are decimals.
15. isdigit()
    • Checks if all characters are digits.
16. isnumeric()
    • Checks if all characters are numeric.
17. isidentifier()
    • Checks for a valid identifier.
18. islower()
    • Checks if all characters are lowercase.
19. isprintable()
    • Checks if all characters are printable.
20. isspace()
    • Checks if all characters are whitespace.
21. istitle()
    • Checks if the string is a title.
22. isupper()
    • Checks if all characters are uppercase.

String Manipulation Methods

23. join(iterable)
    • Joins elements of an iterable with the string acting as a separator.
24. ljust(width[, fillchar])
    • Left-justifies the string.
25. lower()
    • Converts all characters to lowercase.
26. lstrip([chars])
    • Strips leading characters.
27. maketrans(x[, y[, z]])
    • Returns a translation table.
28. translate(table)
    • Translates string using a translation table.
29. partition(sep)
    • Splits the string into a tuple (head, sep, tail).
30. removeprefix(prefix)
    • Removes the specified prefix.
31. removesuffix(suffix)
    • Removes the specified suffix.
32. replace(old, new[, count])
    • Replaces occurrences of old with new.
33. rfind(sub[, start[, end]])
    • Finds the last occurrence of sub.
34. rindex(sub[, start[, end]])
    • Like rfind but raises ValueError if sub is not found.
35. rjust(width[, fillchar])
    • Right-justifies the string.
36. rpartition(sep)
    • Splits into a tuple (tail, sep, head) from the right.
37. rsplit([sep[, maxsplit]])
    • Splits the string from the right.
38. rstrip([chars])
    • Strips trailing characters.
39. split([sep[, maxsplit]])
    • Splits the string from the left.
40. splitlines([keepends])
    • Splits on line breaks.
41. startswith(prefix[, start[, end]])
    • Checks if string starts with the prefix.
42. strip([chars])
    • Strips leading and trailing characters.
43. swapcase()
    • Swaps case; converts uppercase to lowercase and vice versa.
44. title()
    • Converts string to title case.
45. upper()
    • Converts all characters to uppercase.
46. zfill(width)
    • Pads string on the left with zeros.

Conclusion

• Important to know various string methods for efficient string manipulation in Python.
• Practice with these methods to understand their use-cases.
• Reach out with questions or suggestions.
• Happy New Year!