How to define default value if empty user input in Python?

by

Python 3:

inp = int(input("Enter the inputs : ") or "42")

Python 2:

inp = int(raw_input("Enter the inputs : ") or "42")

How does it work?

If nothing was entered then input/raw_input returns empty string. Empty string in Python is False, bool("") -> False. Operator or returns first truthy value, which in this case is "42".

This is not sophisticated input validation, because user can enter anything, e.g. ten space symbols, which then would be True.

More Related Contents:

  1. How does collections.defaultdict work?
  2. How to read multiple lines of raw input?
  3. raw_input without pressing enter
  4. Getting a hidden password input
  5. Is it ever useful to use Python’s input over raw_input?
  6. Getting user input [duplicate]
  7. Python argparse: default value or specified value
  8. Python constructor and default value [duplicate]
  9. How to supply stdin, files and environment variable inputs to Python unit tests?
  10. Named tuple and default values for optional keyword arguments
  11. Getting a default value on index out of range in Python [duplicate]
  12. What is the scope of a defaulted parameter in Python?
  13. Using isdigit for floats?
  14. How do I do simple user input in python? [duplicate]
  15. How can I limit the user input to only integers in Python
  16. Python – Infinite while loop, break on user input
  17. Collections.defaultdict difference with normal dict
  18. In Python, can I specify a function argument’s default in terms of other arguments?
  19. Difference between mutation, rebinding, copying value, and assignment operator [duplicate]
  20. Limiting Python input strings to certain characters and lengths
  21. Identifying the data type of an input
  22. python – returning a default value
  23. Case insensitive user input strings
  24. Defining a default argument as a global variable
  25. waiting for user input in separate thread
  26. How to make a list as the default value for a dictionary? [duplicate]
  27. Imported but unused in python [closed]
  28. How can I use the apply() function for a single column?
  29. Getting values from object oriented tkinter [duplicate]
  30. Matplotlib 3D plot zorder issue

Leave a Comment