Indentation Execute a Python script So far we have played around with Python commands in the Python shell. We want to write now our first serious Python program.
It was a major revision of the language that is not completely backward-compatible. Releases of Python 3 include the 2to3 utility, which automates at least partially the translation of Python 2 code to Python 3.
Object-oriented programming and structured programming are fully supported, and many of its features support functional programming and aspect-oriented programming including by metaprogramming  and metaobjects magic methods. It also features dynamic name resolution late bindingwhich binds method and variable names during program execution.
Python's design offers some support for functional programming in the Lisp tradition. It has filtermapand reduce functions; list comprehensionsdictionariesand sets; and generator expressions. This compact modularity has made it particularly popular as a means of adding programmable interfaces to existing applications.
Van Rossum's vision of a small core language with a large standard library and easily extensible interpreter stemmed from his frustrations with ABCwhich espoused the opposite approach.
As Alex Martelli put it: An important goal of Python's developers is keeping it fun to use. This is reflected in the language's name—a tribute to the British comedy group Monty Python  —and in occasionally playful approaches to tutorials and reference materials, such as examples that refer to spam and eggs from a famous Monty Python sketch instead of the standard foo and bar.
To say that code is pythonic is to say that it uses Python idioms well, that it is natural or shows fluency in the language, that it conforms with Python's minimalist philosophy and emphasis on readability.
In contrast, code that is difficult to understand or reads like a rough transcription from another programming language is called unpythonic. Users and admirers of Python, especially those considered knowledgeable or experienced, are often referred to as Pythonists, Pythonistas, and Pythoneers.
Python syntax and semantics Python is meant to be an easily readable language.
Its formatting is visually uncluttered, and it often uses English keywords where other languages use punctuation. Unlike many other languages, it does not use curly brackets to delimit blocks, and semicolons after statements are optional.
It has fewer syntactic exceptions and special cases than C or Pascal. An increase in indentation comes after certain statements; a decrease in indentation signifies the end of the current block.
Statements and control flow Python's statements include among others: This operates differently than in traditional imperative programming languages, and this fundamental mechanism including the nature of Python's version of variables illuminates many other features of the language.
Assignment in Ce. The right-hand value is copied into an allocated storage location for which the left-hand variable name is the symbolic address.
The memory allocated to the variable is large enough potentially quite large for the declared type. Since the name's storage location doesn't contain the indicated value, it is improper to call it a variable.
Names may be subsequently rebound at any time to objects of greatly varying types, including strings, procedures, complex objects with data and methods, etc.
Successive assignments of a common value to multiple names, e. Since a name is a generic reference holder it is unreasonable to associate a fixed data type with it. However at a given time a name will be bound to some object, which will have a type; thus there is dynamic typing.
The if statement, which conditionally executes a block of code, along with else and elif a contraction of else-if. The for statement, which iterates over an iterable object, capturing each element to a local variable for use by the attached block.
The while statement, which executes a block of code as long as its condition is true. The try statement, which allows exceptions raised in its attached code block to be caught and handled by except clauses; it also ensures that clean-up code in a finally block will always be run regardless of how the block exits.
The raise statement, used to raise a specified exception or re-raise a caught exception. The class statement, which executes a block of code and attaches its local namespace to a classfor use in object-oriented programming.
The def statement, which defines a function or method. The with statement, from Python 2. It is syntactically needed to create an empty code block. The assert statement, used during debugging to check for conditions that ought to apply.
The yield statement, which returns a value from a generator function. This form is used to implement coroutines. The import statement, which is used to import modules whose functions or variables can be used in the current program. There are three ways of using import: The print statement was changed to the print function in Python 3.In the Data Transformation Services (DTS) / Extract Transform and Load (ETL) world these days we've got a LOT of expensive ass products.
Some are good, some are marginal, and some are pieces of over-complicated (and poorly performing) java-based shit. Getting Started with Python Programming for Windows Users Installation of Python. Download the current production version of Python () from the Python Download site.
Double click on the icon of the file that you just downloaded. Running a Python script in bash is very similar to importing that file in Python. The biggest difference is that we don’t expect anything to happen when we import a file, whereas when running a script, we expect to see some output printed to the console.
A Python programming tutorial Version John W. Shipman Abstract A tutorial for the Python programming language, release Python CGI Programming - Learn Python in simple and easy steps starting from basic to advanced concepts with examples including Python Syntax Object Oriented Language, Methods, Tuples, Tools/Utilities, Exceptions Handling, Sockets, GUI, Extentions, XML Programming.
Difference between a Script and a Program There is a fluent passage between scripts and programs. There is a kind of nether land, where the result of the programming can be correctly called a script .