Is there any difference between “foo is None” and “foo == None”?

by

is always returns True if it compares the same object instance

Whereas == is ultimately determined by the __eq__() method

i.e.


>>> class Foo(object):
       def __eq__(self, other):
           return True

>>> f = Foo()
>>> f == None
True
>>> f is None
False

More Related Contents:

  1. Randomly generate 4 or 5 digit Unique Codes in Subsequent Runs of the Script
  2. Why does list.append evaluate to false in a boolean context? [duplicate]
  3. urllib and “SSL: CERTIFICATE_VERIFY_FAILED” Error
  4. How to initialize a two-dimensional array in Python?
  5. How to truncate float values?
  6. Execution of Python code with -m option or not
  7. Python script to do something at the same time every day [duplicate]
  8. Pandas: How to easily share a sample dataframe using df.to_dict()?
  9. Split a string at uppercase letters
  10. Selenium waitForElement
  11. Purpose of calling function without brackets python
  12. How do I do exponentiation in python? [duplicate]
  13. Cannot find vcvarsall.bat when running a Python script
  14. How can I assign the value of a variable using eval in python?
  15. PicklingError: Can’t pickle : it’s not the same object as decimal.Decimal
  16. multiple databases and multiple models in django
  17. How can I save a Librosa spectrogram plot as a specific sized image?
  18. How to print double quotes around a variable?
  19. Install libxml2 and associated python bindings – Windows
  20. how to test if one python module has been imported?
  21. Python import modules from a higher level package
  22. How to parse somewhat wrong JSON with Python?
  23. python 3 open() default encoding
  24. How can I safely create a directory (possibly including intermediate directories)?
  25. Python ConfigParser cannot search .ini file correctly (Ubuntu 14, Python 3.4)
  26. Pandas read_csv dtype read all columns but few as string
  27. Send method using generator. still trying to understand the send method and quirky behaviour
  28. Weird MRO result when inheriting directly from typing.NamedTuple
  29. pycairo “ImportError: DLL load failed: The specified module could not be found.” even after DLLs installed
  30. Get weekday/day-of-week for Datetime column of DataFrame

Leave a Comment