Python testing whether a string is one of a certain set of values [duplicate]

by

You forgot to write s == "no" in your first elif:

def shut_down(s):
    if s == "Yes" or s == "yes" or s == "YES":
        return "Shutting down..."
    elif s == "No" or "no" or "NO":             # you forgot the s== in this line
        return "Shutdown aborted!" 
    else:
        return "Sorry, I didn't understand you."

Do this:

def shut_down(s):
    if s == "Yes" or s == "yes" or s == "YES":
        return "Shutting down..."
    elif s == "No" or s == "no" or s == "NO":       # fixed it 
        return "Shutdown aborted!"
    else:
        return "Sorry, I didn't understand you."

This is because:

elif s == "No" or "no" or "NO":  #<---this
elif s == "No" or True or True:  #<---is the same as this

Since this is the accepted answer I’ll elaborate to include standard practices: The convention for comparing strings regardless of capitalization (equalsIgnoreCase) is to use .lower() like this

elif s.lower() == "no":

More Related Contents:

  1. Why does comparing strings using either ‘==’ or ‘is’ sometimes produce a different result?
  2. String comparison in Python: is vs. == [duplicate]
  3. How to convert a string in the desired manner?
  4. Format timedelta to string
  5. How to search and replace text in a file?
  6. How to get a string after a specific substring?
  7. Print string to text file
  8. How can I do multiple substitutions using regex?
  9. How to find char in string and get all the indexes?
  10. How to split strings into text and number?
  11. Extract email sub-strings from large document
  12. Math operations from string [duplicate]
  13. Find index of last occurrence of a substring in a string
  14. How do I convert a list into a string with spaces in Python?
  15. Safely evaluate simple string equation
  16. Strip spaces/tabs/newlines – python
  17. Python code to remove HTML tags from a string [duplicate]
  18. How to print like printf in Python3?
  19. Why are Python strings immutable? Best practices for using them
  20. Sort list of strings by a part of the string
  21. Filter string data based on its string length
  22. Is there a way to split a string by every nth separator in Python?
  23. Python Remove Comma In Dollar Amount
  24. How do I escape curly-brace ({}) characters in a string while using .format (or an f-string)?
  25. How can Python compare strings with integers?
  26. How to replace whitespaces with underscore?
  27. Print “\n” or newline characters as part of the output on terminal
  28. Most Efficient Way to Find Whether a Large List Contains a Specific String (Python)
  29. Why do I get “TypeError: not all arguments converted during string formatting” trying to substitute a placeholder like {0} using %?
  30. Length of longest word in a list

Leave a Comment