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  • Metaclasses in Python 1.5

    ...variable. It uses a funny name because the user's instance variables (e.g. self.a later in the example) live in the same namespace. The __getattr__ method is invoked whenever the user code references an attribute of the instance that is not an instance variable (nor a class variable; but except for __init__ and __getattr__ there are no class variables). It will be called, for example, when aninstance.method1 is referenced in the example, with self set to aninstance and name set to th...

  • Unifying types and classes in Python 2.2

    ...definition of the save method would mean that a D instance, when requested to save itself, only saves the A and B parts of its data, but not the part of its data defined by class C! C++ notices that D inherits two conflicting definitions of method m, and issues an error message. The author of D is then supposed to override m to resolve the conflict. But what is D's definition of m supposed to do? It can call B's m followed by C's m, but because both definitions call the definition of...

  • Towards a Standard Parser Generator

    ...VARIABLE TYPE="PyObject*" NAME="right"></VARIABLE> <VARIABLE TYPE="PyObject*" NAME="left"></VARIABLE> <VARIABLE TYPE="PyObject*" NAME="expr"></VARIABLE> <CODE_SNIPPET> right = stack_pop(); left = stack_pop(); expr = PyObject_CallMethod(ParsedExpr, "ParsedUnionExpr", "OO", left, right); decref(right); decref(left); stack_push(expr); </CODE_SNIPPET> ...

  • Unifying types and classes in Python 2.2

    ...definition of the save method would mean that a D instance, when requested to save itself, only saves the A and B parts of its data, but not the part of its data defined by class C! C++ notices that D inherits two conflicting definitions of method m, and issues an error message. The author of D is then supposed to override m to resolve the conflict. But what is D's definition of m supposed to do? It can call B's m followed by C's m, but because both definitions call the definition of...

  • Unifying types and classes in Python 2.2

    ...definition of the save method would mean that a D instance, when requested to save itself, only saves the A and B parts of its data, but not the part of its data defined by class C! C++ notices that D inherits two conflicting definitions of method m, and issues an error message. The author of D is then supposed to override m to resolve the conflict. But what is D's definition of m supposed to do? It can call B's m followed by C's m, but because both definitions call the definition of...

  • Unifying types and classes in Python 2.2

    ...definition of the save method would mean that a D instance, when requested to save itself, only saves the A and B parts of its data, but not the part of its data defined by class C! C++ notices that D inherits two conflicting definitions of method m, and issues an error message. The author of D is then supposed to override m to resolve the conflict. But what is D's definition of m supposed to do? It can call B's m followed by C's m, but because both definitions call the definition of...

  • Comparing Python to Other Languages

    ...variable, it seems a waste of time to consider them much for this comparison. Java Python programs are generally expected to run slower than Java programs, but they also take much less time to develop. Python programs are typically 3-5 times shorter than equivalent Java programs. This difference can be attributed to Python's built-in high-level data types and its dynamic typing. For example, a Python programmer wastes no time declaring the types of arguments or variables, and Python...

  • Release – Python 3.9.13

    Version: None

    Released: May 17, 2022

    This is the thirteenth and final regular maintenance release of Python 3.9 Note: The release you're looking at is Python 3.9.13, a bugfix release for the legacy 3.9 series. Python 3.11 is now the latest feature release series of Python 3. Get the latest release of 3.11.x here. According …

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  • Release – Python 3.6.9

    Version: None

    Released: July 2, 2019

    Note: The release you are looking at is Python 3.6.9, a security bugfix release for the legacy 3.6 series which has now reached end-of-life and is no longer supported. See the downloads page for currently supported versions of Python. The final source-only security fix release for 3.6 was 3.6.15 …

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  • Release – Python 3.6.10rc1

    Version: None

    Released: Dec. 11, 2019

    Note Python 3.8 is now released and is the latest feature release of Python 3. Get the latest release of 3.8.x here. Python 3.6.10rc1 is the release candidate preview of the next security fix release of Python 3.6. Python 3.6.8 was the final bugfix release for 3.6. Python 3.6 …

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  • Release – Python 3.6.9rc1

    Version: None

    Released: June 18, 2019

    Python 3.6.9rc1 is a release candidate preview of the latest security fix release of Python 3.6. Note Python 3.7 is now released and is the latest feature release of Python 3. Get the latest release of 3.7.x here. Python 3.6.8 was the final bugfix release for 3.6. Python 3.6 …

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  • Notes

    ...variables in the outer scope, which makes it impossible to determine the bindings for free variables in the inner scope. To avoid the warning about import *, change it into an import of explicitly name object, or move the import* statement to the global scope; to avoid the warning about bare exec, use exec...in... (a good idea anyway -- there's a possibility that bare exec will be deprecated in the future). Use of a global variable in a nested scope with the same name as a local variable in a s...

  • Release – Python 3.6.1rc1

    Version: None

    Released: March 5, 2017

    Python 3.6.1rc1 is a release candidate preview of the first maintenance release of Python 3.6. The Python 3.6 series contains many new features and optimizations. See the What’s New In Python 3.6 document for more information. Major new features of the 3.6 series, compared to 3.5 Among the new major …

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  • Release – Python 3.6.2rc1

    Version: None

    Released: June 17, 2017

    Python 3.6.2rc1 is a release candidate preview of the second maintenance release of Python 3.6. The Python 3.6 series contains many new features and optimizations. See the What’s New In Python 3.6 document for more information. Major new features of the 3.6 series, compared to 3.5 Among the new major …

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  • Release – Python 3.6.2rc2

    Version: None

    Released: July 7, 2017

    Python 3.6.2rc2 is a release candidate preview of the second maintenance release of Python 3.6. The Python 3.6 series contains many new features and optimizations. See the What’s New In Python 3.6 document for more information. Major new features of the 3.6 series, compared to 3.5 Among the new major …

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  • Release – Python 3.6.2

    Version: None

    Released: July 17, 2017

    Note: The release you are looking at is Python 3.6.2, a bugfix release for the legacy 3.6 series which has now reached end-of-life and is no longer supported. See the downloads page for currently supported versions of Python. The final source-only security fix release for 3.6 was 3.6.15 and …

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  • Release – Python 3.6.3rc1

    Version: None

    Released: Sept. 19, 2017

    Python 3.6.3rc1 is a release candidate preview of the third maintenance release of Python 3.6. The Python 3.6 series contains many new features and optimizations. See the What’s New In Python 3.6 document for more information. Major new features of the 3.6 series, compared to 3.5 Among the new major …

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  • Release – Python 3.6.3

    Version: None

    Released: Oct. 3, 2017

    Note: The release you are looking at is Python 3.6.3, a bugfix release for the legacy 3.6 series which has now reached end-of-life and is no longer supported. See the downloads page for currently supported versions of Python. The final source-only security fix release for 3.6 was 3.6.15 and …

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  • Release – Python 3.6.4rc1

    Version: None

    Released: Dec. 5, 2017

    Python 3.6.4rc1 is a release candidate preview of the fourth maintenance release of Python 3.6. The Python 3.6 series contains many new features and optimizations. See the What’s New In Python 3.6 document for more information. Major new features of the 3.6 series, compared to 3.5 Among the new major …

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  • Release – Python 3.6.4

    Version: None

    Released: Dec. 19, 2017

    Note: The release you are looking at is Python 3.6.4, a bugfix release for the legacy 3.6 series which has now reached end-of-life and is no longer supported. See the downloads page for currently supported versions of Python. The final source-only security fix release for 3.6 was 3.6.15 and …

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