python04.html

# python04.html - CHAPTER 4 A variable is a labeled place in...

• Notes
• 5

This preview shows pages 1–3. Sign up to view the full content.

CHAPTER 4 A variable is a labeled place in the computer memory that you can use to store a value in. this is an assignment: x = 5 in the assignment there is a left hand side and a right hand side after x = 5 is executed, the symbol x stands for its value print(x) prints the value of x variable = value remember a variable holds ONE value at a time x = 5 x = 2 print(x) Table Exercise: In the previous chapter you wrote a calculation that determines the number of seconds in a week. Copy this calculation into a program, and assign it to a variable. Then add a statement to print the contents of the variable. x = 5 print( x ) x = 7 * 9 + 13 # overwrite the previous value of x print( x ) x = "A nod is as good as a wink to a blind bat." print( x ) x = int( 15 / 4 ) - 27 print( x ) x = 2 y = 3 print( "x =", x ) print( "y =", y ) print( "x * y =", x * y ) print( "x + y =", x + y ) x = 2 print( x ) x = x + 3 print( x ) what does this print? quick! think about it, don't run the code print(x) x = 5

This preview has intentionally blurred sections. Sign up to view the full version.

A variable name must consist of only letters, digits, and/or underscores (_) A variable name must start with a letter or an underscore A variable name should not be a reserved word these are the reserved (31) words listed by Spronck: but there is a problem with this (see next slide) and del from not while as elif global or with assert else if
This is the end of the preview. Sign up to access the rest of the document.
• Summer '17

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern