Download Python in a Nutshell. A Desktop Quick Reference by Alex Martelli, Anna Ravenscroft, Steve Holden PDF

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By Alex Martelli, Anna Ravenscroft, Steve Holden

Useful in lots of roles, from layout and prototyping to trying out, deployment, and upkeep, Python is constantly ranked between today’s most well liked programming languages. The 3rd version of this useful publication offers a brief connection with the language—including Python 3.5, 2.7, and highlights of 3.6—commonly used components of its mammoth typical library, and a few of the main worthwhile third-party modules and packages.

Ideal for programmers with a few Python event, and people coming to Python from different programming languages, this e-book covers quite a lot of program components, together with internet and community programming, XML dealing with, database interactions, and high-speed numeric computing. realize how Python offers a special mixture of beauty, simplicity, practicality, and sheer power.

This variation covers:

  • Python syntax, Object-Oriented Python, normal library modules, and third-party Python packages
  • Python’s help for dossier and textual content operations, patience and databases, concurrent execution, and numeric computations
  • Networking fundamentals, event-driven programming, and client-side community protocol modules
  • Python extension modules, and instruments for packaging and allotting extensions, modules, and applications

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The Python interpreter also lets you execute Python code interactively, as do IDEs. exe on Win‐ dows). python includes both the interpreter itself and the Python compiler, which is implicitly invoked, as and if needed, on imported modules. Depending on your sys‐ tem, the program may typically have to be in a directory listed in your PATH envi‐ ronment variable. exe, the launcher, installs in the system area of Windows and is therefore guaranteed—bar‐ ring deliberate further manipulation on your part—to be always on the PATH.

In both v2 and v3, you may choose to tell Python that a certain source file is written in a different encoding. In this case, Python uses that encoding to read the file (in v2, you can use non-ASCII characters only in comments and string literals). # coding: iso-8859-1 After coding:, write the name of a codec known to Python and ASCII-compatible, such as utf-8 or iso-8859-1. Note that this coding directive comment (also known as an encoding declaration) is taken as such only if it is at the start of a source file (possibly after the “shebang line,” covered in “Running Python Programs” on page 30).

A hexadecimal literal is 0x followed by a sequence of hexadecimal digits (0 to 9 and A to F, in either upper- or lowercase). maxint, integer literals are instances of built-in type long; v3 does not draw that distinction, but rather uses int as the type of all integers). ), an exponent suffix (an e or E, optionally followed by + or -, followed by one or more digits), or both. ). 0e0 # Floating-point literals A Python floating-point value corresponds to a C double and shares its limits of range and precision, typically 53 bits of precision on modern platforms.

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