Notice: While JavaScript is not essential for this website, your interaction with the content will be limited. Please turn JavaScript on for the full experience.

Search Python.org

Results

  • Unifying types and classes in Python 2.2

    ...type and you're in business. There's a new built-in name, "dict", for the type of dictionaries. (In version 2.2b1 and before, this was called "dictionary"; while in general I don't like abbreviations, "dictionary" was just too long to type, and we've been saying "dict" for years.) This is really just sugar, since there are already two other ways to name this type: type({}) and (after importing the types module) types.DictType (and a third, types.DictionaryType). But now that types p...

  • Unifying types and classes in Python 2.2

    ...type and you're in business. There's a new built-in name, "dict", for the type of dictionaries. (In version 2.2b1 and before, this was called "dictionary"; while in general I don't like abbreviations, "dictionary" was just too long to type, and we've been saying "dict" for years.) This is really just sugar, since there are already two other ways to name this type: type({}) and (after importing the types module) types.DictType (and a third, types.DictionaryType). But now that types p...

  • Unifying types and classes in Python 2.2

    ...type and you're in business. There's a new built-in name, "dict", for the type of dictionaries. (In version 2.2b1 and before, this was called "dictionary"; while in general I don't like abbreviations, "dictionary" was just too long to type, and we've been saying "dict" for years.) This is really just sugar, since there are already two other ways to name this type: type({}) and (after importing the types module) types.DictType (and a third, types.DictionaryType). But now that types p...

  • Unifying types and classes in Python 2.2

    ...type and you're in business. There's a new built-in name, "dict", for the type of dictionaries. (In version 2.2b1 and before, this was called "dictionary"; while in general I don't like abbreviations, "dictionary" was just too long to type, and we've been saying "dict" for years.) This is really just sugar, since there are already two other ways to name this type: type({}) and (after importing the types module) types.DictType (and a third, types.DictionaryType). But now that types p...

  • Metaclasses in Python 1.5

    ...type must be made callable. That's why we need a second type. Whether an object is callable depends on its type. So whether a type object is callable depends on its type, which is a meta-type. (In core Python there is only one meta-type, the type ``type'' (types.TypeType), which is the type of all type objects, even itself.) A new meta-type must be defined that makes the type of the class-like objects callable. (Normally, a third type would also be needed, the new ``instance'' type, ...

  • Towards a Standard Parser Generator

    ...TYPE="s">pathExpr</SYMBOL> <CODE> </CODE> </RULE> <RULE> <SYMBOL TYPE="s">unionExpr</SYMBOL> <SYMBOL TYPE="s">'|'</SYMBOL> <SYMBOL TYPE="s">pathExpr</SYMBOL> <CODE> <VARIABLE TYPE="PyObject*" NAME="right"></VARIABLE> <VARIABLE TYPE="PyObject*" NAME="left"></VARIABLE> <VARIABLE TYPE="PyObject*" NAME="expr"></VARIABLE> <CODE_SNIPPE...

  • Known bugs in Python 2.2.1

    ...types). Use the new and improved dir() function instead. <p><li>type("").__name__ == "str" # was "string" <p><li>type(0L).__name__ == "long" # was "long int" <p><li>Overflowing int operations return the corresponding long value rather than raising the OverflowError exception. <p><li>Conversion of long to float now raises OverflowError if the long is too big to represent as a C double. This used to...

  • Incompatibilities between Python 2.1[.x] and 2.2[.x]

    ...types). Use the new and improved dir() function instead. <p><li>type("").__name__ == "str" # was "string" <p><li>type(0L).__name__ == "long" # was "long int" <p><li>Overflowing int operations return the corresponding long value rather than raising the OverflowError exception. <p><li>Conversion of long to float now raises OverflowError if the long is too big to represent as a C double. This used to...

  • Incompatibilities between Python 2.1[.x] and 2.2[.x]

    ...types). Use the new and improved dir() function instead. <p><li>type("").__name__ == "str" # was "string" <p><li>type(0L).__name__ == "long" # was "long int" <p><li>Overflowing int operations return the corresponding long value rather than raising the OverflowError exception. <p><li>Conversion of long to float now raises OverflowError if the long is too big to represent as a C double. This used to...

  • Search Python Resources

    ...type="hidden" name="sourceid" value="python-search"> <INPUT NAME="q" SIZE="30" VALUE=""> <INPUT type="submit" name="submit" value="Search"><BR> <input type="radio" name="q" value="site:python.org" checked>All of python.org <input type="radio" name="q" value="site:www.python.org">www.python.org <input type="r...

  • Python Success Stories

    ...typesetting solutions. The two most popular are TeX and DocBook, both of which are supported by open source implementations written in C. DocBook was chosen because it had more clearly defined and documented production rules for typesetting elements. DocBook, The Definitive Guide is a real treasure when it comes to explaining these rules in detail. DocBook provides a set of Document Type Definition (.DTD) and Document Stylesheet (.DSL) files written in DSSSL, the Document Style Semantics and Spe...

  • Comparing Python to Other Languages

    ...types and its dynamic typing. For example, a Python programmer wastes no time declaring the types of arguments or variables, and Python's powerful polymorphic list and dictionary types, for which rich syntactic support is built straight into the language, find a use in almost every Python program. Because of the run-time typing, Python's run time must work harder than Java's. For example, when evaluating the expression a+b, it must first inspect the objects a and b to find out their type,...

  • Release – Python 3.8.10

    Version: None

    Released: May 3, 2021

    This is the tenth and final regular maintenance release of Python 3.8 Note: The release you're looking at is Python 3.8.10, a bugfix release for the legacy 3.8 series. Python 3.11 is now the latest feature release series of Python 3. Get the latest release of 3.11.x here. According …

    View Release Notes

  • PyCon Registration Form

    ...type="radio" name="PyCon_amt_req" value="195.00" CHECKED> Regular ($195)</label> <label><input type="radio" name="PyCon_amt_req" value="125.00"> Student ($125)</label><br> PyCon T-Shirt: <input type="hidden" name="enable" value="Tshrt"> <input type="hidden" name="Tshrt_amt_req" value="0"> <label><input type="radio"...

  • PyCon Registration Form

    ...type="radio" name="PyCon_amt_req" value="260.00" CHECKED> Regular ($260)</label> <label><input type="radio" name="PyCon_amt_req" value="150.00"> Student ($150)</label><br> PyCon T-Shirt: <input type="hidden" name="enable" value="Tshrt"> <input type="hidden" name="Tshrt_amt_req" value="0"> <label><input type="radio"...

  • Known bugs in Python 2.2

    ...types). Use the new and improved dir() function instead. <p><li>type("").__name__ == "str" # was "string" <p><li>type(0L).__name__ == "long" # was "long int" <p><li>Overflowing int operations return the corresponding long value rather than raising the OverflowError exception. <p><li>Conversion of long to float now raises OverflowError if the long is too big to represent as a C double. This used to...

  • Standard Exception Classes in Python 1.5

    ...type (usually string or tuple). With the new scheme, the type is a class and the value is a class instance. For example, the following code will break: try: raise Exception() except: print "Sorry:", sys.exc_type + ":", sys.exc_value because it tries to concatenate the exception type (a class object) with a string. A fix (also for the previous example) would be to write try: raise Exception() except: etype = sys.exc_type # Save it; try-excep...

  • Release – Python 3.11.0a5

    Version: None

    Released: Feb. 3, 2022

    This is an early developer preview of Python 3.11 Major new features of the 3.11 series, compared to 3.10 Python 3.11 is still in development. This release, 3.11.0a5 is the fifth of seven planned alpha releases. Alpha releases are intended to make it easier to test the current state of …

  • 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 …

    View Release Notes

  • Python Software Foundation: Vendor Policies

    ...Definition Vendors include various legal entities that provide goods and services to the PSF. Typical legal entities include individuals/sole proprietors, S-Corporations, C-Corporations, partnerships, and LLCs. Vendors include legal entities that are paid for invoices or independent contractor agreements, as well as awards and honorariums. For more information about the tax documentation and implications for various types of vendors, see the Vendor Tax Documents section. Invoices The PSF gener...

« Previous | Next »

Python language documentation

If you didn't find what you need, try your search in the Python language documentation.