NameError: name ‘self’ is not defined [duplicate]

by

Default argument values are evaluated at function define-time, but self is an argument only available at function call time. Thus arguments in the argument list cannot refer each other.

It’s a common pattern to default an argument to None and add a test for that in code:

def p(self, b=None):
    if b is None:
        b = self.a
    print b

Update 2022: Python developers are now considering late-bound argument defaults for future Python versions.

More Related Contents:

  1. Defined variable is not defined
  2. input() error – NameError: name ‘…’ is not defined
  3. Python NameError: name is not defined
  4. NameError: global name ‘unicode’ is not defined – in Python 3
  5. function name is undefined in python class [duplicate]
  6. Python: NameError: global name ‘foobar’ is not defined [duplicate]
  7. Why am I getting a NameError when I try to call my function?
  8. python NameError: global name ‘__file__’ is not defined
  9. input(): “NameError: name ‘n’ is not defined” [duplicate]
  10. How to use multiprocessing pool.map with multiple arguments
  11. Why does substring slicing with index out of range work?
  12. Equation parsing in Python
  13. Play audio with Python
  14. Python eval: is it still dangerous if I disable builtins and attribute access?
  15. Loop over a list containing path to sound files
  16. How to get pixel coordinates for Matplotlib-generated scatterplot?
  17. Identifying the dependency relationship for python packages installed with pip
  18. Pandas Groupby / List to Multiple Rows
  19. Any way to speed up Python and Pygame?
  20. How to set common axes labels for subplots
  21. Draw a line at specific position/annotate a Facetgrid in seaborn
  22. Bare asterisk in function parameters?
  23. Convert month int to month name in Pandas
  24. Move all zeroes to the beginning of a list in Python
  25. Python Weighted Random [duplicate]
  26. Warning raised by inserting 4-byte unicode to mysql
  27. How to remove/omit smaller contour lines using matplotlib
  28. Python: Matplotlib avoid plotting gaps
  29. Does the SVM in sklearn support incremental (online) learning?
  30. Test type of elements python tuple/list

Leave a Comment