Iteration in Python PYTHON by Ravinder Nath Rajotiya - April 19, 2022April 22, 20220 Iteration- for and while loop: Iterations are used for repetitive execution of the same block of code over and over. Loop or iteration are popular block of code in all the programming language like basic, PASCAL, C, JAVA, PHP and all others. They can be numeric or collection based. Type of Iteration There are two types of iteration: a) Definite iteration, in which the number of repetitions is specified explicitly in advance. This is implemented using the for loop. b) Indefinite iteration, in which the code block executes until some condition is met. This type of iteration is implemented using the while loop How to check if an object is iterable? we can check whether an object is itrable r not by passing it to the
Set in Python PYTHON by Ravinder Nath Rajotiya - April 10, 2022April 11, 20220 SETS in PYTHON A set is an unordered collection of items. Every element of a set is unique, i.e. there are no duplicate. A set itself is a mutable i.e. we can add or remove items in a set. Items of a set are immutable i.e. we cannot modify items of a set using its index. A set is declared using {} or in-built set() function How many items in a set: A set can have any number of integer, float, tuple, string types etc s={3,5,”Hello”, 3.14} What cannot be in a set: A set cannot have mutable elements like lists, sets or dictionaries as its elements. So it will be wrong to create a set: >>>s={3,5, [6,7], 3.14} error – set cannot have list as the set
Dictionary in Python PYTHON by Ravinder Nath Rajotiya - March 28, 2022March 29, 20220 DICTIONRY IN PYTHON Dictionary is a composite data type. It is used to represent records. The items in dictionary are represented by the key: value pairs. Declaration : A dictionary is declared by enclosing a comma-separated list of key-value pairs in curly braces. The value of an item is always accessed by using its key, therefore the key must be a unique name. Example dict={<key1> : <value>, <key2> : <value>, <key3> : <value>.......<keyn> : <value>} Th following define a dictionay that maps the capital to its country. capital_country = {‘Delhi’ : ‘India’, ‘Karachi’, ‘Pakistan’, ‘Kathmandu’ : ‘Nepal’ } Dictionary in python is similar to List in python. Let us see the similarty and differences between list and dictionary LIST DICTIONARY Is mutable Is mutable Can grow and shrink Can grow and
Tuple in Python PYTHON by Ravinder Nath Rajotiya - March 12, 2022March 20, 20220 Tuples Tuples in Python are similar to lists. A tuple is a sequence of comma separated numbers. A tuple can be decared as a sequence by enclosing or without enclosing them inside the () bracket and all elements are separated with commas. Elements in a tuple can be accessed via unpacking or indexing. Following are the two ways to declare the tuple in Python. a). Declaring and accessing tuple using indexing: >>>tup=(3,4,5,6,7) Or >>> tup=3,4,5,6,7 >>>tup1 (3,4,5,6,7) >>>tup[2] 5 >>>tup(3) 6 Since the tuple is immutable, A tuple does not have the append () or insert () method, nor can it be assigned to another element. >>>tup1=(3,4,5,6,7) >>>tup1[0]= 2 will give an error. TypeError: 'tuple' object does not support item assignment Because a tuple is unchangeable, the code is more secure. Therefore,
Introduction to Python PYTHON by Ravinder Nath Rajotiya - February 23, 2022March 13, 20220 Introduction to Python Python is one of the mostly used programming language in the world. Python is a general-purpose interpreted, interactive, object-oriented, and high-level programming language. Guido van Rossum created this during 1985- 1990. Python is an open source programming language and its source code is available under the GNU General Public License (GPL). Some key features of python – Python is Interpreted: Python is processed at runtime by the interpreter. You do not need to compile your program before executing it. This is similar to PERL and PHP. Python is Interactive: You can sit at a Python prompt and interact with the interpreter directly to write your programs. Python is Object-Oriented: Python supports Object-Oriented style or technique of programming