Python 1: Introduction to Python

Python 1: Introduction to Python
Class 2 Exercise

The Class Exercises are designed to give you hands on experience
In this exercise you will learn to do two things ...
which you need to know for this course
- Running Python in interactive mode
- Creating a Python script/program

Enter Python interactive mode
```
python3
```
Be sure you type "python3", not "python".

Typing "python" will run the wrong version of the Python interpreter.
Use the help() function
```
>>> help("topics")
```
Use this function to learn more about assignment in Python
```
>>> help("ASSIGNMENT")
```
Advance through this help entry

Keep hitting Space until you get to the end.
Quit this help entry

Type q to quit.
Create some variables
```
>>> a = 5
>>> b = 6
>>> c = 10
```
Check the values you have just entered
```
>>> a
>>> b
>>> c
```

Perform some arithmetic

>>> a + b + c
>>> a * b + c
>>> a * b * c
>>> a * b / c

Print some phrases

>>> print("Hello world!")
>>> print("Go Red Sox!")

For help with the work below, see this video.

Create the script ex2.py using the nano text editor
```
nano  ex2.py
```
You must run this command while you are in your ex2 directory inside you ex directory.
Enter the text for this script
```
print("Hello world!")
```
Save your changes
```
Control O
```
The name of the file will appear in black toward the bottom of the screen.

Hit Enter or Return to make this go away and save the file.
Quit nano
```
Control X
```
Run this script
```
python3  ex2.py
```
You should see
```
Hello world!
```
Let me check your work

Come to me so I can check your script.