Python Quick Guide. Python Quick Guide. Python Overview: Python is a high- level, interpreted, interactive and object oriented- scripting language. Python is Interpreted. Python is Interactive. Python is Object- Oriented. Python is Beginner's Language.

Python was developed by Guido van Rossum in the late eighties and early nineties at the National Research Institute for Mathematics and Computer Science in the Netherlands. Python's feature highlights include: Easy- to- learn. Easy- to- read. Easy- to- maintain. A broad standard library.

Interactive Mode. Portable. Extendable. Databases. GUI Programming. Scalable. Getting Python: The most up- to- date and current source code, binaries, documentation, news, etc. The documentation is available in HTML, PDF, and Post. Script formats. Python Documentation Website : www.

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First Python Program: Interactive Mode Programming: Invoking the interpreter without passing a script file as a parameter brings up the following prompt. Python 2. 5 (r. 25: 5. Nov 6 2. 00. 7, 1. An identifier starts with a letter A to Z or a to z or an underscore (. Python is a case sensitive programming language.

Starting an identifier with two leading underscores indicates a strongly private identifier. If the identifier also ends with two trailing underscores, the identifier is a language- defined special name. Reserved Words: The following list shows the reserved words in Python. These reserved words may not be used as constant or variable or any other identifier names. Lines and Indentation: One of the first caveats programmers encounter when learning Python is the fact that there are no braces to indicate blocks of code for class and function definitions or flow control. Blocks of code are denoted by line indentation, which is rigidly enforced. The number of spaces in the indentation is variable, but all statements within the block must be indented the same amount.

Both blocks in this example are fine. Python does, however, allow the use of the line continuation character (\) to denote that the line should continue.

For example. total = item. For example. days = .

For example, all the following are legal. It is. made up of multiple lines and sentences. All characters after the # and up to the physical line end are part of the comment, and the Python interpreter ignores them. Here is a sample snip using the semicolon. Multiple Statement Groups as Suites: Groups of individual statements making up a single code block are called suites in Python. Compound or complex statements, such as if, while, def, and class, are those which require a header line and a suite.

Header lines begin the statement (with the keyword) and terminate with a colon ( : ) and are followed by one or more lines which make up the suite. Example. if expression . Python - Variable Types: Variables are nothing but reserved memory locations to store values.

This means that when you create a variable you reserve some space in memory. Based on the data type of a variable, the interpreter allocates memory and decides what can be stored in the reserved memory. Therefore, by assigning different data types to variables, you can store integers, decimals, or characters in these variables. Assigning Values to Variables: The operand to the left of the = operator is the name of the variable, and the operand to the right of the = operator is the value stored in the variable. For example. counter = 1. An integer assignment. A floating point.

For example. Python supports four different numerical types: int (signed integers)long (long integers . A list contains items separated by commas and enclosed within square brackets (. A tuple consists of a number of values separated by commas. Unlike lists, however, tuples are enclosed within parentheses.

Tuples can be thought of as read- only lists. They work like associative arrays or hashes found in Perl and consist of key- value pairs. Checks if the value of two operands are equal or not, if yes then condition becomes true. The left operands value is moved left by the number of bits specified by the right operand. The left operands value is moved right by the number of bits specified by the right operand. If both the operands are true then then condition becomes true. If a condition is true then Logical NOT operator will make false.

This results in a loop that never ends. Such a loop is called an infinite loop. An infinite loop might be useful in client/server programming where the server needs to run continuously so that client programs can communicate with it as and when required. Single Statement Suites: Similar to the if statement syntax, if your while clause consists only of a single statement, it may be placed on the same line as the while header. Here is an example of a one- line while clause.

The for Loop: The syntax of the loop look is. The break statement can be used in both while and for loops. The continue statement rejects all the remaining statements in the current iteration of the loop and moves the control back to the top of the loop.

The continue statement can be used in both while and for loops. The pass is also useful in places where your code will eventually go, but has not been written yet (e. Python'. if letter == 'h'. This is pass block'. Current Letter : ', letter.

Here are simple rules to define a function in Python: Function blocks begin with the keyword def followed by the function name and parentheses ( ( ) ). Any input parameters or arguments should be placed within these parentheses. You can also define parameters inside these parentheses. The first statement of a function can be an optional statement - the documentation string of the function or docstring.

The code block within every function starts with a colon (: ) and is indented. The statement return . A return statement with no arguments is the same as.

None. Syntax. def functionname( parameters ). This function takes a string as input parameter and prints it on standard screen. Grouping related code into a module makes the code easier to understand and use.

A module is a Python object with arbitrarily named attributes that you can bind and reference. Simply, a module is a file consisting of Python code. A module can define functions, classes, and variables. A module can also include runnable code. Example: The Python code for a module named aname normally resides in a file named aname. Here's an example of a simple module, hello.

A search path is a list of directories that the interpreter searches before importing a module. Example: To import the module hello. Import module hello. Now you can call defined function that module as follows. This prevents the module execution from happening over and over again if multiple imports.

Opening and Closing Files: The open Function: Before you can read or write a file, you have to open it using Python's built- in open() function. This function creates a file object which would be utilized to call other support methods associated with it. Syntax. file object = open(file. A complete list of possible values is given below in the table.

This is optional parameter and the default file access mode is read (r) buffering: If the buffering value is set to 0, no buffering will take place. If the buffering value is 1, line buffering will be performed while accessing a file. If you specify the buffering value as an integer greater than 1, then buffering action will be performed with the indicated buffer size. This is optional paramter.

Here is a list of the different modes of opening a file: Modes. Descriptionr. Opens a file for reading only. The file pointer is placed at the beginning of the file.

This is the default mode. Opens a file for reading only in binary format. The file pointer is placed at the beginning of the file. Disable Auto Arrange In Windows 7 Folders Are Hidden.

This is the default mode. Opens a file for both reading and writing. The file pointer will be at the beginning of the file. Opens a file for both reading and writing in binary format. The file pointer will be at the beginning of the file. Opens a file for writing only.

Overwrites the file if the file exists.