IT 116: Introduction to Scripting

IT 116: Introduction to Scripting
Class 4 Exercise

Practice with interactive mode

Run IDLE on your machine
Write a comment
```
# Hello world!
```
Nothing prints because the Python interpreter ignores everything after #.
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.

Script for this exercise

Open a text editor
Use the editor built into IDLE.
From the File menu, click and drag down to New File.
Copy the text below into the file

Save the file as ex4.py
Run this script in IDLE
Open the script file in IDLE. Under the Run menu, select Run Module.

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

Copy the file to Unix

Open FileZilla and connect to pe15.cs.umb.edu
You will have to connect using your Unix username and password.
Go to your 116 directory
Go to your ex directory
Inside this directory create the directory ex4
Right-click in the whitespace inside the ex directory.
Click and drag down to Create directory.
Add ex4 to the path in the dialog box.
Click OK.
Copy your script to pe15
Click and drag your ex4.py file to the ex4 directory

Running my test script on your script (Optional)

If you want to run my text script on your Class Exercise script do the following
Connect to pe15.cs.umb.edu
Use an ssh client.
Run my test code on your script
```
~ghoffman/it116_test/ex04.sh
```
The script will prompt you for your Unix username.