**Hey, My Name is Vaibhav Singh and let me help you in getting started with basic Python Language and Programmes. **

Note: To keep this post interesting till the end, I am skipping the theory part. Although I will be explaining each of the terms that will be used in the programme.

## Lesson 1 (Understanding Language)

#### Software Required

You can learn making the following programmes using both offline and online compilers. **PyCharm** is one of the popularly known offline compiler. I will suggest to use **OnlineGdb** if you want to learn python using online compiler without installing any software on your Pc/laptop.

## Arithmetic Operations

#### 1) Addition

Suppose we have to make a simple Python Programme to get the addition of two given numbers. Following will be the steps to proceed:

- Assign Number to variable 1
- Assign Number to variable 2
- Assign variable 3 to add variable 1 and variable 2
- Print the Variable 3

Confusing? No problem! Let us understand this with an example.

**Q- Make a Python programme to Add 15 + 10. **

Let us follow the above steps to solve this problem.

Step 1: Take a Variable “a” equal to 15

Step 2: Take a Variable “b” equal to 10

Step 3: Take a Variable “c” equal to “a+b”

Step 4: Print Variable “c”

The Output you will get = 25

or **Simplified Method **can be, let variable “c” = 15 + 10 and then print the variable “c”.

Now you understand how one programme can be made with different methods. Also, we minimized the lines of coding.

#### 2) Subtraction / Division and Multiplication

Similarly you can perform different arithmetic operations like Subtraction, Multiplication, Division using the same set of codes. You will need to **replace “+”** with any other arithmetic symbol like **“-” for subtraction, “*” for multiplication, “/” for divide.**

### Q- Make a Program to find if number is Positive, Negative or Zero

**a = int(input(“Enter A \n”))**

**if a > 0:**

** print(“A is Positive”)**

**elif a==0:**

** print(“A is equal to zero“)**

**else:**

** print(“A is negative“)**

**STEP WISE EXPLANATION:**

**Step 1: Take Input from the user**

To take Input from the user, we will use the function int(input(“Enter A \n”)) and will assign it to variable 1

**a = int(input(“Enter A \n”))**

**Step 2: Use If and Else statement to determine whether number inserted by user is positive, negative or zero.**

- If A > 0, it will imply that A is positive.

**if a > 0:**

** print(“A is Positive”)**

- If A==0 imply that A is equal to zero. Here “==” stands for the equal symbol. We will use the Elif funtion which stands for “Else If”.

**elif a==0:**

** print(“A is equal to zero”)**

- If A < 0 implies that A is negative.

**else:**

** print(“A is negative“)**