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Python_02_problemset.md

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Python 2 Problem Set -- Operators, Truth, Logic

Part 1: Use Interpreter

A. Use the Interactive Interpretor to test to see if you can find an 'ATG' in the following DNA string:

GTACCTTGATTTCGTATTCTGAGAGGCTGCTGCTTAGCGGTAGCCCCTTGGTTTCCGTGGCAACGGAAAA

B. How about 'TTT'?

C. If you didn't already save the DNA string to a variable, do that now and redo part A and B.

D. In the interpretor use bool to test a variety of values like '', 0, 0.0, FALSE, false, True, true, 'True', 'False' to see if they evaluate to True or False.

E. Quit Interpreter

Part 2: Use Text Editor

  1. Using a text editor (not the interperter), write a script that

    • Assigns a value to a variable
    • Has a if/else statment in which:
      • It prints out a confirmation of truth if the value is true, like "Aye Captain" or something less sea worthy
      • It prints out "Not True" if the value is not true. (so boring)

  2. Make sure to commit your changes along the way. You can wait until the end to push them to your remote repo, if you like, or you can do it now.

  3. Create a script that has an if/else statement with the following conditions (remember to write a little bit at a time and test it)

    • Test to see if a number is positive or negative
    • print "positive" if it is positive
    • print "negative" if it is negative
    • save it and run it.

  4. Add an elif to test if the number is equal to 0. Save it and run it.

  5. Add nested tests to your last script

    • if it is positive, in addition to printing "positive"
    • test if it is smaller than 50
    • save it and run it

  6. Add more nested tests to your script.

    • if it is smaller than 50
    • test if the number is even
    • if it is smaller than 50 and even, print "it is an even number that is smaller than 50"
    • save it and run it

  7. Add more nested tests.

    • if it is larger than 50,
    • test if the number is divisible by 3
    • if the number is larger than 50 and divisible by 3, print "it is larger than 50 and divisible by 3"
    • save it and run it

  8. In your previous nested test script, test the number 50. What prints to the screen? Is it the correct response? If not, you have a semantic error and need to alter your code to be correct with any number.

  9. Write a new script that does all the testing in 3-8, but gets the value being tested from the command line (use sys.argv) and stores it in a variable. Add in a print statement that reminds the user what number is being tested. Remember sys in the notes.

  10. ADD/COMMIT/PUSH