Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Number data types store numeric values. Number objects are created when you assign a value to them. For example −var1 = 1var2 = 10You can also delete the reference to a number object by using the del statement. The syntax of the del statement is −del var1[, var2[, var3[...., varN]]]]You can delete a single object or multiple objects by using the del statement. For example −del vardel var_a, var_bPython supports four different numerical types −int (signed integers)long (long integers, they can also be represented in octal and hexadecimal)float (floating point real values)complex (complex numbers)ExamplesHere are some examples of numbers −intlongfloatcomplex1051924361L0.03.14j1051924361L0.03.14j100-0x19323L15.2015.20-7860122L-21.99.322e-36j0800xDEFABCECBDAECBFBAEl32.3+e18876j-0490535633629843L-90.-.6545+0J-0x260-052318172735L-32.54e1003e+26J0x69-4721885298529L70.2-E124.53e-7jPython ... Read More
The parent object provides a reference to the main window from the child.The following is the parent code. The directive below triggers the iFrame to send a message to the parent window every 3 seconds. No initial message from the main window needed!var a= window.addEventListener ? "addEventListener" : "attachEvent";// here a is the event method var b= window[a];// here b is the eventer var c= a== "attachEvent" ? "onmessage" : "message";// here c is the message event // Listen to message from child window b (c, function(e) { var d= e.message ? "message" : "data";// here d is ... Read More
Python allows you to assign a single value to several variables simultaneously. For example −a = b = c = 1Here, an integer object is created with the value 1, and all three variables are assigned to the same memory location. You can also assign multiple objects to multiple variables. For example −a,b,c = 1,2,"john"Here, two integer objects with values 1 and 2 are assigned to variables a and b respectively, and one string object with the value "john" is assigned to the variable c.
Python accepts single ('), double (") and triple (''' or """) quotes to denote string literals, as long as the same type of quote starts and ends the string.The triple quotes are used to span the string across multiple lines. For example, all the following are legal −word = 'word' sentence = "This is a sentence." paragraph = """This is a paragraph. It is made up of multiple lines and sentences."""
Python provides 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. For example −if True: print "True" else: print "False"However, the following block generates an error −if True: print "Answer" print "True" else: print "Answer" print "False"Thus, in Python all the continuous lines indented with same number of spaces would form a block. The following example has various statement blocks −Note − ... Read More
Use the accept attribute to set the types of files that the server accepts in HTML. Use the attribute only with .ExampleYou can try to run the following code to work with the accept attribute: File Upload Box The capture attribute is a boolean attribute that, if specified, indicates that the capture of media directly from the device...is preferred.The capture attribute is NOT used to include the camera option in the dialog but to indicate that direct capture from the webcam is preferred. The "correct" code is given below
A Python identifier is a name used to identify a variable, function, class, module or other object. An identifier starts with a letter A to Z or a to z or an underscore (_) followed by zero or more letters, underscores and digits (0 to 9).Python does not allow punctuation characters such as @, $, and % within identifiers. Python is a case sensitive programming language. Thus, Manpower and manpower are two different identifiers in Python.Here are naming conventions for Python identifiers −Class names start with an uppercase letter. All other identifiers start with a lowercase letter.Starting an identifier with ... Read More
Here are important environment variables, which can be recognized by Python −Sr.No.Variable & Description1PYTHONPATHIt has a role similar to PATH. This variable tells the Python interpreter where to locate the module files imported into a program. It should include the Python source library directory and the directories containing Python source code. PYTHONPATH is sometimes preset by the Python installer.2PYTHONSTARTUPIt contains the path of an initialization file containing Python source code. It is executed every time you start the interpreter. It is named as .pythonrc.py in Unix and it contains commands that load utilities or modify PYTHONPATH.3PYTHONCASEOKIt is used in Windows ... Read More
Python distribution is available for a wide variety of platforms. You need to download only the binary code applicable for your platform and install Python.If the binary code for your platform is not available, you need a C compiler to compile the source code manually. Compiling the source code offers more flexibility in terms of choice of features that you require in your installation.Recent Macs come with Python installed, but it may be several years out of date. Seehttp://www.python.org/download/mac/ for instructions on getting the current version along with extra tools to support development on the Mac. For older Mac OS's ... Read More
Python distribution is available for a wide variety of platforms. You need to download only the binary code applicable for your platform and install Python.If the binary code for your platform is not available, you need a C compiler to compile the source code manually. Compiling the source code offers more flexibility in terms of choice of features that you require in your installation.Here are the simple steps to install Python on Unix/Linux machine.Open a Web browser and go to https://www.python.org/downloads/Follow the link to download zipped source code available for Unix/Linux.Download and extract files.Editing the Modules/Setup file if you want to customize ... Read More