**[RQ-1]**: Which of the following statements is correct?**Ans:***The Ipython Shell is typically used to work with Python interactively*.

**[RQ-2]**: Which file extension is used for Python script files?****Ans:**.py

**[RQ-3]**: You need to print the result of adding 3 and 4 inside a script. Which line of code should you write in the script?**Ans:**print(int x + int y)

**The Python Interface -- 100xp, Status : Earned**

```
In [1]:
```# working with print function
print(5 / 8)
# Add another print function on new line
print(7 + 10)

```
```

**When to use python? -- 50xp, Status : Earned**

Python is a pretty versatile language. For what applications can you use Python?

**Ans:** *All of the above*

**Any comments? -- 100xp, Satatus : Earned**

We can add comments to python scripts.

Comments are short snippets of plain english, to help you and others understand what the code is about.

To add a comment, use '#'tag, insert it at the front of the text.

Comments have idle state, i.e. they don't affect the code results.

Comments are ignored by the python interpretor.

```
In [2]:
```# Just testing division
print(5 / 8)
# Additon works too ( added comment here )
print(7 + 10)

```
```

**Python as a calculator -- 100xp, Status : Earned**

Python is perfectly suited to do basic calculations. Apart from addition, subtraction, multiplication and division, there is also support for more advanced operations such as:

- Exponentiation:
**. This operator raises the number to its left to the power of the number to its right: for example 4**2 will give 16.

- Modulo: %. It returns the remainder of the division of the number to the left by the number on its right, for example 18 % 7 equals 4.

```
In [9]:
```"""Suppose you have $100, which you can invest with a 10% return each year. After one year, it's
100 x 1.1 = 110 dollars, and after two years it's 100 x 1.1 x 1.1 = 121.
Add code to calculate how much money you end up with after 7 years"""
print(5 + 5)
print(5 - 5)
# Multiplication and division
print(3 * 5)
print(10 / 2)
# Exponentiation
print(4 ** 2)
# Modulo
print(18 % 7)
# How much is your $100 worth after 7 years?
# first try was unsuccesful, so used the only two things * and ** operators.
print ( 100 * ( 1.1 ** 7 ) )

```
```