Outline for September 27, 2022

Reading: §2, 4.4
Assignments: Homework 1, due October 5, 2022

1. Assignment [swap.py]
   1. Simple assignment: variable = expression
   2. Simultaneous assignment: variableA, variableB = expressionA, expressionB

2. Exception NameError — local or global name is not found

3. Example
   1. Compute the hypotenuse of a right triangle [hypotnoex.py]

4. Exception SyntaxError — Python parser encountered a malformed statement

5. Exception ZeroDivisionError — attempt to divide (or take the remainder of) something by 0 [divby0.py, divby0ex1.py]

6. The difference between strings and integers [twoplustwo.py]
   1. Difference between ’2 + 2’, 2 + 2

7. Exception TypeError — operation or function applied to operand of wrong type
   1. Typing letters when a number is expected [divby0ex2.py]

8. Type converter functions int, float, str

9. String operators
   1. Operator +: string concatenation
   2. Operator *: repetition

10. Input [make_change_ex.py]
    1. input(prompt) prints prompt, waits for user
    2. When user hits enter, it returns what was typed as a string

11. Basic output [printend.py]
    1. print(a, b, ...)
    2. end=’XXX’

Matt Bishop Office: 2209 Watershed Sciences Phone: +1 (530) 752-8060 Email: [email protected]

ECS 235A, Computer and Information Security Version of September 26, 2022 at 10:51PM

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