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  1. What is the Python regular expression to check if a string is alphanumeric?

  2. How to check if a Python string contains only digits?

  3. How to check if a string only contains certain characters in Python?

  4. How to check if a unicode string contains only numeric characters in Python?

  5. How to check if a string contains only lower case letters in Python?

  6. How to check if a string contains only upper case letters in Python?

  7. How to check if a string contains only whitespace letters in Python?

  8. How to check if text is “empty” (spaces, tabs, newlines) in Python?

  9. How to check if a character is upper-case in Python?

  10. How to join two strings to convert to a single string in Python?

  11. How to get the length of a string in Python?

  12. How to get the size of a string in Python?

  13. How can I fill out a Python string with spaces?

  14. How to convert all uppercase letters in string to lowercase in Python?

  15. How to remove all leading whitespace in string in Python?

  16. How to get max alphabetical character from the string in Python?

  17. How to get min alphabetical character from the string in Python?

  18. How to replace all occurrences of a string with another string in Python?

  19. How to find index of last occurrence of a substring in a string in Python?

  20. How to search a string in backwards direction in Python?
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