replacing `import` with `accio`
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Replacing `import` with `accio`! Compiling Pythons with Custom Grammar for the sake of a joke! In Python, overwriting builtin functions is fairly easy. You can even do it in the interpreter! But can you overwrite a statement, like import, just as easily? Let's go on an adventure, discovering how the import statement works, and how Python statements are defined in the CPython source code. We'll face some consequences of bootstrapping, and, to get our custom Harry Potter-themed Grammar to work, we'll have to compile a Python to compile a Python.
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replacing `import` with `accio`
- 3. >>> import random! ! >>> random.random()! 0.18660693012691754! ! >>> accio random! File "<stdin>", line 1! accio random! ^! SyntaxError: invalid syntax
- 4. >>> import random! ! >>> random.random()! 0.18660693012691754! ! >>> accio random! File "<stdin>", line 1! accio random! ^! SyntaxError: invalid syntax
- 5. >>> import random! ! >>> random.random()! 0.18660693012691754! ! >>> accio random! File "<stdin>", line 1! accio random! ^! SyntaxError: invalid syntax
- 6. >>> import random! ! >>> random.random()! 0.18660693012691754! ! >>> accio random! File "<stdin>", line 1! accio random! ^! SyntaxError: invalid syntax
- 7. >>> import random! ! >>> random.random()! 0.18660693012691754! ! >>> accio random! File "<stdin>", line 1! accio random! ^! SyntaxError: invalid syntax
- 8. nagini
- 9. >>> accio random!! ! # no error! ! >>> random.random()! 0.18660693012691754! ! >>> import random! File "<stdin>", line 1! import random! ^! SyntaxError: invalid syntax
- 10. >>> accio random!! ! # no error! ! >>> random.random()! 0.18660693012691754! ! >>> import random! File "<stdin>", line 1! import random! ^! SyntaxError: invalid syntax
- 11. >>> accio random!! ! # no error! ! >>> random.random()! 0.18660693012691754! ! >>> import random! File "<stdin>", line 1! import random! ^! SyntaxError: invalid syntax
- 12. >>> accio random!! ! # no error! ! >>> random.random()! 0.18660693012691754! ! >>> import random! File "<stdin>", line 1! import random! ^! SyntaxError: invalid syntax
- 13. >>> accio random!! ! # no error! ! >>> random.random()! 0.18660693012691754! ! >>> import random! File "<stdin>", line 1! import random! ^! SyntaxError: invalid syntax
- 16. >>> __builtins__! <module '__builtin__' (built-in)>! ! >>> dir(__builtins__)! [‘ArithmeticError’,…,’__import__’, …,’float’,…,’zip']
- 17. >>> __builtins__! <module '__builtin__' (built-in)>! ! >>> dir(__builtins__)! [‘ArithmeticError’,…,’__import__’, …,’float’,…,’zip']
- 18. >>> __builtins__! <module '__builtin__' (built-in)>! ! >>> dir(__builtins__)! [‘ArithmeticError’,…,’__import__’, …,’float’,…,’zip']
- 19. >>> __builtins__! <module '__builtin__' (built-in)>! ! >>> dir(__builtins__)! [‘ArithmeticError’,…,’__import__’, …,’float’,…,’zip']
- 21. >>> float(3)! 3.0! ! >>> wingardium_leviosa = __builtins__.float! ! >>> wingardium_leviosa(3)! 3.0
- 22. >>> float(3)! 3.0! ! >>> wingardium_leviosa = __builtins__.float! ! >>> wingardium_leviosa(3)! 3.0
- 23. >>> float(3)! 3.0! ! >>> wingardium_leviosa = __builtins__.float! ! >>> wingardium_leviosa(3)! 3.0
- 24. >>> float(3)! 3.0! ! >>> wingardium_leviosa = __builtins__.float! ! >>> wingardium_leviosa(3)! 3.0
- 25. >>> float(3)! 3.0! ! >>> wingardium_leviosa = __builtins__.float! ! >>> wingardium_leviosa(3)! 3.0
- 27. >>> del __builtins__.float! ! >>> float(3)! Traceback (most recent call last):! File "<stdin>", line 1, in <module>! NameError: name 'float' is not defined! ! >>> wingardium_leviosa(3)! 3.0
- 28. >>> del __builtins__.float! ! >>> float(3)! Traceback (most recent call last):! File "<stdin>", line 1, in <module>! NameError: name 'float' is not defined! ! >>> wingardium_leviosa(3)! 3.0
- 29. >>> del __builtins__.float! ! >>> float(3)! Traceback (most recent call last):! File "<stdin>", line 1, in <module>! NameError: name 'float' is not defined! ! >>> wingardium_leviosa(3)! 3.0
- 30. >>> del __builtins__.float! ! >>> float(3)! Traceback (most recent call last):! File "<stdin>", line 1, in <module>! NameError: name 'float' is not defined! ! >>> wingardium_leviosa(3)! 3.0
- 31. >>> del __builtins__.float! ! >>> float(3)! Traceback (most recent call last):! File "<stdin>", line 1, in <module>! NameError: name 'float' is not defined! ! >>> wingardium_leviosa(3)! 3.0
- 34. >>> accio = import! File "<stdin>", line 1! accio = import! ^! SyntaxError: invalid syntax
- 35. >>> accio = import! File "<stdin>", line 1! accio = import! ^! SyntaxError: invalid syntax
- 36. :(
- 38. >>> del import! File "<stdin>", line 1! del = import! ^! SyntaxError: invalid syntax
- 39. >>> del import! File "<stdin>", line 1! del = import! ^! SyntaxError: invalid syntax
- 40. :(
- 41. __import__
- 42. >>> dir(__builtins__)! [‘ArithmeticError’,…,’__import__’, …,’float’,…,’zip’]! ! >>> __builtins__.__import__! <built-in function __import__>
- 43. >>> dir(__builtins__)! [‘ArithmeticError’,…,’__import__’, …,’float’,…,’zip’]! ! >>> __builtins__.__import__! <built-in function __import__>
- 44. >>> dir(__builtins__)! [‘ArithmeticError’,…,’__import__’, …,’float’,…,’zip’]! ! >>> __builtins__.__import__! <built-in function __import__>
- 45. >>> dir(__builtins__)! [‘ArithmeticError’,…,’__import__’, …,’float’,…,’zip’]! ! >>> __builtins__.__import__! <built-in function __import__>
- 46. >>> __builtins__.__import__(random)! Traceback (most recent call last):! File "<stdin>", line 1, in <module>! NameError: name 'random' is not defined! ! >>> __builtins__.__import__(‘random’)! <module 'random' from ‘/usr/local/…/ random.pyc’>
- 47. >>> __builtins__.__import__(random)! Traceback (most recent call last):! File "<stdin>", line 1, in <module>! NameError: name 'random' is not defined! ! >>> __builtins__.__import__(‘random’)! <module 'random' from ‘/usr/local/…/ random.pyc’>
- 48. >>> __builtins__.__import__(random)! Traceback (most recent call last):! File "<stdin>", line 1, in <module>! NameError: name 'random' is not defined! ! >>> __builtins__.__import__(‘random’)! <module 'random' from ‘/usr/local/…/ random.pyc’>
- 49. >>> __builtins__.__import__(random)! Traceback (most recent call last):! File "<stdin>", line 1, in <module>! NameError: name 'random' is not defined! ! >>> __builtins__.__import__(‘random’)! <module 'random' from ‘/usr/local/…/ random.pyc’>
- 50. >>> random = __builtins__.__import__(‘random’)! ! >>> random.random()! 0.05857571707711129
- 51. >>> random = __builtins__.__import__(‘random’)! ! >>> random.random()! 0.05857571707711129
- 52. >>> random = __builtins__.__import__(‘random’)! ! >>> random.random()! 0.05857571707711129
- 54. >>> accio = __builtins__.__import__! ! >>> random = accio(‘random’)! ! >>> random.random()! 0.8735934644377295
- 55. >>> accio = __builtins__.__import__! ! >>> random = accio(‘random’)! ! >>> random.random()! 0.8735934644377295
- 56. >>> accio = __builtins__.__import__! ! >>> random = accio(‘random’)! ! >>> random.random()! 0.8735934644377295
- 57. >>> accio = __builtins__.__import__! ! >>> random = accio(‘random’)! ! >>> random.random()! 0.8735934644377295
- 59. >>> del __builtins__.__import__! ! >>> random = accio(‘random’)! Traceback (most recent call last):! File "<stdin>", line 1, in <module>! File “/usr/local/…/random.py”, line 42, in <module>! from __future__ import division! ImportError: __import__ not found
- 60. >>> del __builtins__.__import__! ! >>> random = accio(‘random’)! Traceback (most recent call last):! File "<stdin>", line 1, in <module>! File “/usr/local/…/random.py”, line 42, in <module>! from __future__ import division! ImportError: __import__ not found
- 61. >>> del __builtins__.__import__! ! >>> random = accio(‘random’)! Traceback (most recent call last):! File "<stdin>", line 1, in <module>! File “/usr/local/…/random.py”, line 42, in <module>! from __future__ import division! ImportError: __import__ not found
- 62. `import x` is a statement
- 64. clone cpython!
- 65. $ ls -d cpython/*/! Doc/!! ! ! ! Objects/! Grammar/!! ! PC/! Include/!! ! PCbuild/! Lib/!! ! ! ! Parser/! Mac/!! ! ! ! Python/! Misc/!! ! ! Tools/! Modules/
- 66. $ ls -d cpython/*/! Doc/!! ! ! ! Objects/! Grammar/!! ! PC/! Include/!! ! PCbuild/! Lib/!! ! ! ! Parser/! Mac/!! ! ! ! Python/! Misc/!! ! ! Tools/! Modules/
- 67. $ ls -d cpython/*/! Doc/!! ! ! ! Objects/! Grammar/!! ! PC/! Include/!! ! PCbuild/! Lib/!! ! ! ! Parser/! Mac/!! ! ! ! Python/! Misc/!! ! ! Tools/! Modules/
- 68. import_stmt: import_name | ! ! ! import_from! import_name: 'import' dotted_as_names! import_from: ('from' (‘.'* ! ! ! dotted_name | '.'+)'import' (‘*'! ! ! | '(' import_as_names ')' | ! ! ! import_as_names))
- 69. import_stmt: import_name | ! ! ! import_from! import_name: 'import' dotted_as_names! import_from: ('from' (‘.'* ! ! ! dotted_name | '.'+)'import' (‘*'! ! ! | '(' import_as_names ')' | ! ! ! import_as_names))
- 70. import_stmt: import_name | ! ! ! import_from! import_name: 'import' dotted_as_names! import_from: ('from' (‘.'* ! ! ! dotted_name | '.'+)'import' (‘*'! ! ! | '(' import_as_names ')' | ! ! ! import_as_names))
- 71. import_name: ! ! import matplotlib.pyplot as plt! ! import_from:! ! from matplotlib import pyplot as plt
- 72. import_name: ! ! import matplotlib.pyplot as plt! ! import_from:! ! from matplotlib import pyplot as plt
- 73. import_stmt: import_name | ! ! ! import_from! import_name: 'import' dotted_as_names! import_from: ('from' (‘.'* ! ! ! dotted_name | ‘.'+) 'import' (‘*'! ! ! | '(' import_as_names ')' | ! ! ! import_as_names))
- 74. import_stmt: import_name | ! ! ! import_from! import_name: 'accio' dotted_as_names! import_from: ('from' (‘.'* ! ! ! dotted_name | ‘.'+) 'accio' (‘*'! ! ! | '(' import_as_names ')' | ! ! ! import_as_names))
- 75. $ make! Traceback (most recent call last):! …! File “/…/cpython/Lib/sysconfig.py”, line 4! import sys! ^! SyntaxError: invalid syntax
- 76. $ make! Traceback (most recent call last):! …! File “/…/cpython/Lib/sysconfig.py”, line 4! import sys! ^! SyntaxError: invalid syntax
- 77. half of cpython is written in python!
- 78. $ (script that replaces `import` with `accio` in all .py files)! ! $ make! Traceback (most recent call last):! …! accio sys! ^! SyntaxError: invalid syntax
- 79. $ (script that replaces `import` with `accio` in all .py cpython files)! ! $ make! Traceback (most recent call last):! …! accio sys! ^! SyntaxError: invalid syntax
- 80. $ (script that replaces `import` with `accio` in all .py cpython files)! ! $ make! Traceback (most recent call last):! …! accio sys! ^! SyntaxError: invalid syntax
- 81. wat!
- 83. import_stmt: import_name | ! ! ! import_from! import_name: 'import' dotted_as_names! import_from: ('from' (‘.'* ! ! ! dotted_name | '.'+)'import' (‘*'! ! ! | '(' import_as_names ')' | ! ! ! import_as_names))
- 84. import_stmt: import_name | ! ! ! import_from! import_name: 'import' dotted_as_names! import_from: ('from' (‘.'* ! ! ! dotted_name | '.'+)'import' (‘*'! ! ! | '(' import_as_names ')' | ! ! ! import_as_names))
- 85. import_name: 'import' dotted_as_names! ! ! | 'accio' dotted_as_names
- 86. import_name: 'import' dotted_as_names! ! ! | 'accio' dotted_as_names
- 87. $ make! ! $ ./python! ! >>> accio random!! ! # no errors!! ! >>> import sys!! ! ! # no errors :(
- 88. $ make! ! $ ./python! ! >>> accio random!! ! # no errors!! ! >>> import sys!! ! ! # no errors :(
- 89. $ make! ! $ ./python! ! >>> accio random!! ! # no errors!! ! >>> import sys!! ! ! # no errors :(
- 90. $ make! ! $ ./python! ! >>> accio random!! ! # no errors!! ! >>> import sys!! ! ! # no errors :(
- 91. yo dawg I heard you like pythons
- 92. fin