In this lecture we will learn: - How operations are performed in Python language? - Different types of Arithmetic operations - What are strings? - How strings are used in Python? - Function in a Python - Concatenation and Repetition of Strings - New line character and Raw string #1 - We will the Python IDLE in this tutorial. - The language that the computer understands is Binary Code i.e, 0 and 1. - We use a programming language to write code, which is neither a binary language nor English. - Programming language has its own protocols and grammar which we use. - We will write code in a programming language say Python and then it will convert into a binary format that the computer will understand. - We can perform several operations using Python language. #2 - Starting with operations like Addition, Subtraction, Multiplication, and Division. - We do addition, subtraction and multiplication with integer values, and then it gives us answers also in integer data type. - But when performing division with integer values then it gives us an answer in float data type. - Float stands for Floating Point Representation. - When we divide two integer values then it might be possible that the answer can in decimal. e.g., 5/2 = 2.5 - As the interpreter wants to give you an exact answer for the division also, it will return it in float. - If you want to get only the quotient part or the integer part of the answer and want to neglect the decimal value, it can be done with the help of (//). - // (double slash) is used for division when you want to return only an integer value in the answer. - // is also called Integer Division or Floor Division. - We can multiple operations in a single statement as well. - We need to follow the proper syntax for the programming language. - If we apply an operation but do not give operands, then it will give an error. 8+9- = Error - We can also apply BODMASS rules of mathematics to perform operations. - Double asterisks (**) is used to find the power of a number. number ** power = 2**3 = 2*2*2 - To get the remainder, we use the modulus operator (%).
#3 - String is a combination of characters like "Youtube", "Camera", "Telusko", "Python", etc., all are strings. - Whenever we use strings, we need to use double quotes(" ") or single quotes(' ') with it in python. - If you back-slash(\) to tell the python to ignore the special meaning of that double and single quotes. - If you use a back-slash before a single or double quotes then the quote is also treated as a simple character.
#4 - Function is a set of tasks that can be done. We need to call functions. There are several functions in Python like the print() function. - Round brackets are used with a function to pass a parameter in it. - We can define our own functions as well.
#5 - Concatenation is used to combine two things like we can convert two strings into one using concatenation. - Concatenation is done using the (+) operator. e.g., 'navin' + 'navin'
- Repetition is used to print a single value multiple times like we can print a string like "Navin" multiple times. - Repetition is done using the (*) operator. e.g., 'navin' * 3
#6 - (\n) has a special meaning in Python. It is used to enter a new line. - To print the original string or to neglect the meaning of \n, we have to use a Raw String. - Raw string is a string that returns it as it is without making any changes to it. - We have to specify (r) before the quote to print the same string that is present inside the quotes.
