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Vocab: Expressions and Values Statements:

• Every expression will evaluate to a value.

• Statements do not evluate to values but modify the flow of the program

• Assignment statements

• if statneemtns(conditional statements)

• def statements

• while loops

• Can't exactly print or return a statement

• Later on, we'll run into some expressions that look similar to statemnets

Control Minilecture if condition: body of code Check condition -> if expression evaluates to True, execute code inside!

check condition ONLY IF previous if statement's condition was False! elif -> else if cond

We reach the else if all the previous conditions evaluated to False

Environment Diagrams:

• Environment diagrams are the system we use to keep track of variables/functions and their values.
• We start off in the global frame when we first start a program
  • new frames are opened when we calla new function
• PythonTutor is very helpful for walking through environemnt diagram q's (Resources Tab of cs61a.org website)