IT 116: Introduction to Scripting

IT 116: Introduction to Scripting
Class 4 Exercise

Log in to users3

Run an SSH client
Run putty.exe if you have a PC or Terminal if you have a Mac.
Enter your password

Create a directory for this exercise

Go to your home directory
```
cd
```
Go to your it116 directory
```
cd  it116
```
Go to your ex directory
```
cd ex
```
Make sure you are in your ex directory
```
pwd
```
If you are not in /home/UNIX_ID/it116/ex, see me.
Create a directory for this exercise
```
mkdir  ex4
```
Check that the directory was created
```
ls
```
Go to this new directory
```
cd ex4
```

Practice with interactive mode

Enter Python interactive mode
```
python3
```
Try to create a variable with an illegal name
```
>>> 1st_try = 55
```
You get an error message because the a variable name cannot start with a digit.
Create the variable score and assign it an integer value
```
>>> score = 85
```
Run type on score
```
>>> type(score)
```
Assign score a decimal value
```
>>> score = 85.0
```
Run type on score
```
>>> type(score)
```
Assign score a string value
```
>>> score = "85"
```
Run type on score
```
>>> type(score)
```

Write a print statement that has more than one argument

>>> print("My score on the test was", score, "but I hope to do better next time")

Use the import function to read a string from the keyboard
```
>>> name = input("Please enter your name: ")
```
Print the value of the variable name
```
>>> print(name)
```
Get the data type of the value in the variable
```
>>> type(name)
```
Read in a value from the keyboard and convert it to integer
```
>>> number = int(input("Please enter an integer: "))
```
Get the data type of the variable
```
>>> type(number)
```

Read a value from the keyboard and convert it into a float

>>> number = float(input("Please enter a decimal number: "))

Get the data type of the variable
```
>>> type(number)
```
Try to covert the value of name into an integer
```
>>> number = int(name)
```
You get an error message because the text value of name can't be converted into an integer.
Quit interactive mode

Control D

Script for this Exercise

Create the script ex4.py
```
nano ex4.py
```
Enter the following text into the script file

Run this script
```
python3  ex4.py
```

You should see something like this

Assigning an integer value to score_1
score_1 85
score_1 is <class 'int'>

Assigning a decimal value to score_2
score_2 85.0
score_2 is <class 'float'>

Assigning a string value to score_3
score_3 85
score_3 is <class 'str'>

Please enter an integer: 55
The value of number_1 is 55
number_1 is <class 'int'>

Please enter a decimal number: 67.3
The value of number_2 is 67.3
number_2 is <class 'float'>

The text in blue is entered by the user

Running my test script on your script

If you want to run my text script on your Class Exercise script do the following
Run ex04.sh on your script
```
~ghoffman/it116_test/ex04.sh
```
The script will prompt you for your Unix username.