SophiaPretty

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About SophiaPretty

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Accounting,Algebra,Applied Sciences,Architecture and Design,Art & Design,Biology,Business & Finance,Calculus,Chemistry,Communications,Computer Science,Economics,Engineering,English,Environmental science,Essay writing Hide all
Teaching Since: Jul 2017
Last Sign in: 305 Weeks Ago, 1 Day Ago
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  • MBA,PHD, Juris Doctor
    Strayer,Devery,Harvard University
    Mar-1995 - Mar-2002

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  • Manager Planning
    WalMart
    Mar-2001 - Feb-2009

Category > Computer Science Posted 20 Nov 2017 My Price 10.00

3 files in an email with the subject line ”Homework #2

Please do the HW2 and HW3.......................................

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    • Homework #2 Due: 2017-04-18 23:59 How to submit this homework You will attach 3 files in an email with the subject line ”Homework #2 - YOUR NAME” (replace ”YOUR NAME” with your real name) sent to huang.uclax@gmail.com: • File 1: the screen shot of Problem 1 (Spyder installation), e.g. hw2-1.png • File 2: the python program file of Problem 2, e.g. hw2-2.py. I will execute the file ”as is” against a different input file ”hw2.txt” to verify your output. • File 3: the answers to all questions of Problem 3 in a text file, e.g. hw2-3.txt. Problem 1 Install spyder ”spyder” is a (free) Python integrated development environment (IDE). Now that you already installed miniconda (in Homework #1), issue the following command to install spyder in a terminal: conda install spyder After the installation is completed, issue the command in the same terminal: spyder In a few seconds, the spyder window should appear that looks similar to: Submit the screenshot image file with the rest of this homework. 1 Problem 2 The text file hw2.txt contains a number of Python expressions, one on each line. Write a program to evaluate and print out the values of all expressions. For example, suppose the file hw2.txt contains: 2 + 3 * 5 3**2 + 4 * 5 2 > 3 Your program’s output would be: 17 29 False Use following steps to construct and test your program: 1. Enter the following contents into a text file hw2.txt: 2 + 3 * 5 3**2 + 4 * 5 2 > 3 Note: the file must be a text file. To create the text file, you can use the Spyder IDE (see Problem 1), but not a word processor (e.g. Microsoft Word). Note: Do not contains any empty lines. Do not add an extra empty lines beyond the last expression. 2. Open the file using open() as a read-only file. 3. Read all file contents into a list using readlines(). 4. For each item in the list • remove possible leading and trailing white spaces by the string method strip(). • For each (stripped) item, evaluate the expression using the built-in function eval(). • Print the result on the screen. Hint: your program may look something like: ... = open(’hw2.txt’, ’r’) ... = f.readlines() for r in ...: ... = r.strip() ... = eval(...) print(...) Verify your program Run your program with hw2.txt. The output should look like: 17 29 False If you get the error message, SyntaxError: unexpected EOF while parsing you probably have empty lines in hw2.txt. Remove the empty lines in hw2.txt and try again. Try changing the contents of hw2.txt. Re-run the program. Does the results reflect your changes? If everything looks correct, submit the Python program file with the rest of this homework. 2 Bonus points What if there are empty lines in hw2.txt? How would you modify the code to ignore the empty lines and still produce correct output? For example, if hw2.txt contains an empty line between 2 + 3*5: and 3**2 + 4*5 2 + 3*5 3**2 + 4 * 5 2 > 3 Modify your program so it ignores the empty lines and generates the same output: 17 29 False Hint: Running strip() on the empty line will result in a 0-length string (i.e. len(s) == 0). Problem 3 For eacth set of Python commands, write down the final value of x. If the expression is invalid, explain why. 1. x = [1,2] + [3,4] 2. x = [hi]*3 3. x = [3,5,7] x.append(8) 4. x = {’x’: 3, ’y’:5} x[’p’] = 7 5. x = ’hello’ x[1] = ’a’ 6. x = 2 > 3 and (4 < 5 or 6 > 7) 7. y = ’alasfjsdlafjajoiwjrofm;flskajfsakdjckljfd’ x = y[-2] 8. x = ’hello’ + ’world’ 9. y = [1, 2, 3, [5, 6, 7]] x = y[3][-1] 10. y = [1, 2, 3, [5, 6, 7]] x = y[3][-1] 11. (Using Python 3) x = 5 / 3 12. y = (3,5,7) x = y[0] 13. x = 3 ** 2 * 5 / 10 + 5 14. a = 5 b = 2.5 c = a + b x = type(c) 15. a = [1,2,3] x = a[3] 3 16. a = [’cat’, ’dog’, ’fox’] x = ’CAT’ in a 17. a = [’cat’, ’dog’, ’fox’] x = [’cat’, ’dog’] in a 18. a = [1,2,3,4,5] b = a[2:] x = len(b) 4

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SophiaPretty
(5)
Status NEW Posted 20 Nov 2017 07:11 AM My Price 10.00

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