15-112 Agenda 24-May

• Feedback loop
  • daily hw tells you where you are
  • reports, autolab,etc
• all nighters / sleep
• Schedule adjustment
• Extra office hours on Friday
• Switching between screens feedback
• Code Block Of The Day

from twilio.rest import Client
account_sid = "FILL_ME_IN"
auth_token = "FILL_ME_IN"
Client(account_sid, auth_token).api.account.messages.create(
    to="FILL_ME_IN",
    from_="+12062032019",
    body="hi"
)

• Reading submitted code: loops on hw1 ; cheating
• Audit clarification
  • Normal student enrolled for a grade
  • Officially Audit
    • registered on SIO
    • full access to normal course resources (office hours, quizzes, etc)
    • not required to take exams, successful participation assessed by homeworks + TP. Can be negotiated with instructor.
  • Sit in on lecture
    • not registered on SIO
    • can sit in on lecture and be on autolab/piazza
    • no access to office hours, no quizzes, etc.
• Why we care about the next 3 topics
  • Smart ship USS Yorktown was left dead in the water in 1997 for nearly 3 hours after a divide by zero error.
  • Toyota’s electronic throttle control system (ETCS) had bugs that could cause sudden unintended acceleration.
  • Knight Capital Group
    • lost $440 million in 45 minutes
    • 75% of its value in 1 day
    • used to handle 22billion trades a day
  • Mars Climate Orbiter was also destroyed, due to software on the ground generating commands in pound-force (lbf), while the orbiter expected newtons (N).
• Testing
  • Review of how a test function works + deeper explanation of starter file
  • Elements of a good test function
  • Console + Graphics (not responsible, but brief overview)
  • Simple try/except (not responsible for anything beyond try/except)
• Style
  • Lots of places have different style guides, you don’t stick with your own
  • Overview of style rules

• Debugging

  • Syntax: Read the error, find the line, look at lines near it

  def isCrazyMathNum(x):
      works = (x + (x//(2) + (x**2 / x))
      print(works)
      return works
  

  • Runtime + Logic
    • Find the smallest test case to make it fail
    • Add print statements for your variables + where the code has reached
    • Trace what you think should happen
    • Run it and compare

  def abs(x):
      if x < 0:
          x == -x
      return x
  print(abs(-3))
  

• Leftovers

  • Day1: Getting Started
    • Syntax, Runtime, Logical Errors
    • Console Input
    • Other modules
  • Day1: Data and Expressions
    • not operator
    • Short circuit evaluation
  • Day1: Functions
    • Vocab
  • Day3: Strings
    • Basic File IO
• Check: https://tinyurl.com/summer112att4
• Quiz (this section will probably be moved to Friday’s lecture)
  • Quiz Tuesday in recitation, review during lecture Tuesday
  • Quiz covers Syllabus,day1, day2, day3, and day4 (lightly)
  • What does a quiz look like?
  • Strings roc1 and how to approach roc problems
  • How to approach FR problems (spend a bit planning, but make sure to write code)
  • How to approach the quiz in general (ct + roc no credit for scratch work)