You can create empty list object by giving no elements in square brackets in assignment statement. Empty list object is also created by list() built-in function without any arguments >>> L1 = [] >>> L1 [] >>> L1 = list() >>> L1 []

Python 3.0 was released in Dec. 2008. It was designed to rectify certain flaws in earlier version. The guiding principle of Python 3 was: "reduce feature duplication by removing old ways of doing things". Python 3.0 doesn’t provide backward compatibility. That means a Python program written using version 2.x syntax ... Read More

Comment is a piece of text in a computer program that is meant to be a programmer-readable explanation or annotation in the source code and not ignored by compiler/interpreter. In Python script, the symbol # indicates start of comment line. C like block comment (/* .. */) is not available ... Read More

When used with strings, asterisk (*) is defined as repetition operator. It concatenates given string as many times as number followed by asterisk. >>> string = 'abcdefghij' >>> print (string*2) abcdefghijabcdefghij

When used with strings, plus (+) is defined as concatenation operator. It appends second string to the first string. >>> s1 = 'TutorialsPoint ' >>> s2 = 'Hyderabad' >>> print (s1+s2) TutorialsPoint Hyderabad

Any built-in data type converted into its string representation by str() function >>> str(10) '10' >>> str(11.11) '11.11' >>> str(3+4j) '(3+4j)' >>> str([1, 2, 3]) '[1, 2, 3]' >>> str((1, 2, 3)) '(1, 2, 3)' >>> str({1:11, 2:22, 3:33}) '{1: 11, 2: 22, 3: 33}' For a user ... Read More

Built-in dictionary class has update() method which merges elements of argument dictionary object with calling dictionary object. >>> a = {1:'a', 2:'b', 3:'c'} >>> b = {'x':1, 'y':2, 'z':3} >>> a.update(b) >>> a {1: 'a', 2: 'b', 3: 'c', 'x': 1, 'y': 2, 'z': 3} From Python 3.5 ... Read More

Dictionary is an unordered collection of key-value pairs. Each element is not identified by positional index. Moreover, the fact that key can’t be repeated, we simply use a new key and assign a value to it so that a new pair will be added to dictionary. >>> D1 = ... Read More

You can use any Python aware editor to write Python script. Standard distribution of Python comes with IDLE module which is an integrated development and learning environment. Start IDLE and open a new file from file menu. In the editor page enter print (“Hello World!”) Save the script ... Read More

In Python, tuple object is an immutable collection of items, not necessarily of same type. Items are separated by comma and placed inside parentheses, although they are optional. >>> T1 = (1, 'one', 3.45, [1, 2, 3]) >>> T2 = 1, 2, 3, 4 Empty tuple object is ... Read More