Lesson 2 - Inputs

Review:

• string: a letter, a word, anything that is represented by its word form and has no quantity value
• integer: a number
• the string '1' is not the number 1. It is the representation of the word 1.

There is 1 basic way for Python 3 to get info from a user:

input - this command stores the value as a string

int(input(" ") - this converts what is input into an integer or numerical value

Let's try an example:

Guiding Questions;

1. What happens if you get rid of the quotes or one of the () brackets from line 3. What error do you get?
2. What happens if you type a word in when asked "What is Item 1's cost?"
3. What was the point of putting a spaces after the question mark for each question?
4. What happens if you use " " quotes instead of ' ' apostrophes when using input or print?
5. What type of variable is item1 and item2?
6. What type of variable is cost1 and cost2?
7. How is Line 8 able to output the variable values?

Explanation of Code:

To allow the user to enter information, you need to know TWO things:

• The type: string or integer
• The name of the variable you want to store the information etnered

There are two types of inputs:

• input() - for strings
• int(input( )) - for integers (numbers)

When you make an input, you're giving the user a chance to enter information. That information must be in the form of either a string or integer.

The input function allows you to also print text that is within its quotes

An input must be stored in a variable so you can use it later. You can call this variable anything you want but it should be related to what kind of information is being stored.

Example 1:

name = input("What is your name?")

This line of code stores whatever the user enters as a name into the variable called name. It also prints the line "What is your name?"

Example 2:

age = int( input("What is your age?"))

This line of code stores whatever the user enters as their age into the integer variable called age. It also prints the line "What is your age?"

Adding Variables to Inputs

The input statement can print ONE string.

So you can print variables inside of Input statements as long as you make what's in the brackets one string using +

Keep in mind that only strings can be merged with strings so if you want to put an integer inside, you need to convert the integer to a string:

• str( ) : this converts whatever is in the brackets to a string
• Example: str (5) or str(score)
• int() : this converts from a string to an integer

Try the program below

Assignment #2

Make a program that does the following:

1. Asks you what your name is
2. Asks you what your age is
3. Asks you what your friend's name is
4. Asks you what your friend's age is
5. Tells you the difference between your age and your friend's age, mentioning both names (ie. The number of years Joe and Bob are apart is 5!)
6. Tells you the total years shared between your age and your friend's age, mentioning both names (ie. Joe and Bob are a total of 100 years old!) It's ok if you get a negative number. If you really want to do absolute value, check this out: https://www.geeksforgeeks.org/abs-in-python/
7. Has each line commented to explain what it does. EACH LINE!

If you have any questions about specifics...ASK!

Submit your assignment in the standard link below.