Introduction The move from Python 2.x to 3.x introduced a window of time where a number of changes could be made in order to cleanup the language. In doing so, a level of backwards incompatibility was introduced for the betterment the language. Outlined below are details of the changes introduced in Python 3 and their impact on porting. Organizational Changes Over the lifetime of Python, the names of some packages and modules have deviated from the standards laid out in PEP 8. Name Changes The following modules were renamed outright. When writing code to support both Python 2 and 3 in the same codebase, a common import idiom is to try the new name first, then fall back to the old name imported as the new name. try: import queueexcept ImportError: import Queue as queue Reorganization The following objects were renamed and moved into packages in order to group common functionality.
The following built-in functions were moved into packages. Printing Imports. Python - How to create egg file using pydev plugin in eclipse? PyPI - the Python Package Index : Python Package Index. Eclipse with PyDev and Virtualenv - Neil Traft. These are instructions for someone who may have already dabbled with some Python programming and is now looking for a more professional setup for productive development.
I'll get you started with Python package management and IDE configuration. Justification first; skip to the procedure if you're already sold. Why PyDev If you don't already have a favorite development environment for Python, I highly recommend using PyDev. A lot of people are still in the dark ages, using things like IDLE. Just the use of the Eclipse editor alone will make for a much nicer programming experience. So please do take the time to set up a proper IDE. Why Virtualenv You should also take the time to properly quarantine the dependencies for different projects. Here's the short version: pip lets you install packages (Python libraries). Even if you're not worried about conflicts, virtualenv can help you make sure your demo still works years from now (especially important if you care about reproducible research).
A non-magical introduction to Pip and Virtualenv for Python beginners - DabApps, Brighton, UK. Tagged: python technical One of the hurdles that new Python developers have to get over is understanding the Python packaging ecosystem.
This blog post is based on material covered in our Python for Programmers training course, which attempts to explain pip and virtualenv for new Python users. Prerequisites Python for Programmers is aimed at developers who are already familiar with one or more programming languages, and so we assume a certain amount of technical knowledge. Pip. 4. More Control Flow Tools — Python 2.7.9 documentation. Besides the while statement just introduced, Python knows the usual control flow statements known from other languages, with some twists. 4.1. if Statements Perhaps the most well-known statement type is the if statement.
For example: >>> x = int(raw_input("Please enter an integer: "))Please enter an integer: 42>>> if x < 0:... x = 0... print 'Negative changed to zero'... elif x == 0:... print 'Zero'... elif x == 1:... print 'Single'... else:... print 'More'...More There can be zero or more elif parts, and the else part is optional. The Python Tutorial — Python 2.7.9 documentation. Python is an easy to learn, powerful programming language.
It has efficient high-level data structures and a simple but effective approach to object-oriented programming. Python’s elegant syntax and dynamic typing, together with its interpreted nature, make it an ideal language for scripting and rapid application development in many areas on most platforms. The Python interpreter and the extensive standard library are freely available in source or binary form for all major platforms from the Python Web site, and may be freely distributed.
The same site also contains distributions of and pointers to many free third party Python modules, programs and tools, and additional documentation. The Python interpreter is easily extended with new functions and data types implemented in C or C++ (or other languages callable from C). Book/ Think Python. The Art and Craft of Programming. Book/ 2.5.4 Documentation - 23rd December, 2008.
Python. Python Programming/Getting Python. In order to program in Python you need the Python interpreter.
If it is not already installed or if the version you are using is obsolete, you will need to obtain and install Python using the methods below: Python 2 vs Python 3 In 2008, a new version of Python (version 3) was published that was not entirely backward compatible. Developers were asked to switch to the new version as soon as possible but many of the common external modules are not yet (as of Aug 2010) available for Python 3. There is a program called 2to3 to convert the source code of a Python 2 program to the source code of a Python 3 program. Installing Python in Windows Go to the Python Homepage or the ActiveState website and get the proper version for your platform. The PATH variable can be modified from the Window's System control panel. If you prefer having a temporary environment, you can create a new command prompt short-cut that automatically executes the following statement: PATH %PATH%;c:\python27.