Python 1: Introduction to Python

Python 1: Introduction to Python
Class 4 Exercise

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 input 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

Code for this Exercise

Create the code ex4.py
Enter the following text into the code file

Run this code
```
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
Submit your ex4.py file