Difference between revisions of "CSC111 Homework 4 2015"

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Line 1,603: Line 1,603:
 
import sys
 
import sys
 
import random
 
import random
 +
import subprocess
  
 
#--- define what the student program is called, and what the solution
 
#--- define what the student program is called, and what the solution
Line 1,638: Line 1,639:
  
 
     return (foundDef, foundCall)
 
     return (foundDef, foundCall)
 +
 +
# checkModuleRunsOK: runs the module as a shell subprocess and
 +
# look for errors in the output.  This is required, because otherwise
 +
# importing the module in this program will make this program crash.
 +
# It's not possible (as far as I can tell0 to catch exceptions from
 +
# the import or __module__ statements.
 +
# returns True, none if no errors, otherwise False, string if there's
 +
# an exception, and the error message (string) is in the returned 2nd
 +
# arg.
 +
# The module name is assumed to not include ".py"
 +
def checkModuleRunsOk( module, inputFileName ):
 +
    p = subprocess.Popen( [ "python3", module+".py" ],
 +
                          stdout=subprocess.PIPE,
 +
                          stderr=subprocess.PIPE,
 +
                          stdin=subprocess.PIPE)
 +
 +
    p.stdin.write( bytes( open( inputFileName, "r" ).read(), 'UTF-8' ) )
 +
    data = p.communicate( )
 +
    p.stdin.close()
 +
 +
    error = data[1].decode( 'UTF-8' )
 +
    if len( error ) > 1:
 +
        return False, error
 +
    return True, None
 +
 
                        
 
                        
 
def generateInputFileWithRandomInputs( inputFileName ):
 
def generateInputFileWithRandomInputs( inputFileName ):
Line 1,664: Line 1,690:
 
         text += word + "\n"
 
         text += word + "\n"
 
     file.close()
 
     file.close()
 +
    return text
 +
 +
# extractTextFromErrorMessage( sys_exc_info ):
 +
def extractTextFromErrorMessage( sys_exc_info ):
 +
    print( "sys_exec_info = ", sys_exc_info )
 +
    text = ""
 +
    for field in sys_exc_info:
 +
        if type( field )==type( " " ):
 +
            text += field + "\n"
 
     return text
 
     return text
  
Line 1,669: Line 1,704:
 
# runs the module, passes it data from the input file on its stdin
 
# runs the module, passes it data from the input file on its stdin
 
# and get its output on stdout captured in outputFileName.
 
# and get its output on stdout captured in outputFileName.
 +
# We assume the module will not crash, because we already tested
 +
# it with checkModuleRunsOk().
 
def runModule( module, inputFileName, outputFileName ):
 
def runModule( module, inputFileName, outputFileName ):
 +
    error = False
 +
 
     #--- make stdin read information from the text file
 
     #--- make stdin read information from the text file
 
     sys.stdin = open( inputFileName, "r" )
 
     sys.stdin = open( inputFileName, "r" )
Line 1,675: Line 1,714:
 
     #--- capture the stdout of the program to test into a file
 
     #--- capture the stdout of the program to test into a file
 
     saveStdOut = sys.stdout
 
     saveStdOut = sys.stdout
 +
    saveStdErr = sys.stderr
 +
 
     sys.stdout = open( outputFileName, "w" )
 
     sys.stdout = open( outputFileName, "w" )
 +
    sys.stderr = open( "errorOut", "w" )
  
 
     #--- run the student program ---
 
     #--- run the student program ---
−
     _module = __import__(  module  )
+
     try:
−
 
+
        _module = __import__(  module  )
 +
    except:
 +
        error = True
 +
        sys.stderr.close()
 +
        sys.stderr = saveStdErr
 +
        sys.stdout.close()
 +
        sys.stdout = saveStdOut
 +
        text = sys.exc_info()[0]
 +
        text = extractTextFromErrorMessage( text )
 +
        print( "*** sys.exc_info() = ", text )
 +
        return error, text
 +
       
 
     #--- filter out junk from output of program ---
 
     #--- filter out junk from output of program ---
 
     sys.stdout.close()
 
     sys.stdout.close()
Line 1,690: Line 1,743:
 
     #print( text, end="" )
 
     #print( text, end="" )
 
     file.close()
 
     file.close()
−
     return text
+
     return False, text
  
 
def removeBlankLines( lines ):
 
def removeBlankLines( lines ):
Line 1,723: Line 1,776:
 
     global solutionModule
 
     global solutionModule
  
 +
   
 
     #--- check that the main module uses a main() function
 
     #--- check that the main module uses a main() function
 
     foundDef, foundCall = checkForFunctionPresence( module, "main" )
 
     foundDef, foundCall = checkForFunctionPresence( module, "main" )
Line 1,735: Line 1,789:
 
     inputLines = generateInputFileWithRandomInputs( "input" )
 
     inputLines = generateInputFileWithRandomInputs( "input" )
  
−
     userOutText = runModule( module, "input", "userOut" )
+
     Ok, errorMessage = checkModuleRunsOk( module, "input" )
−
     expectedOutText = runModule( solutionModule, "input", "expectedOut" )
+
    if not Ok:
 +
        commentLong( "- Your program crashed...\n"
 +
                    + "Your program was tested with:\n"
 +
                    + inputLines  + "\n"
 +
                    + "Error message:\n"
 +
                    + errorMessage + "\n" )
 +
        printGrade( 50 )
 +
        return
 +
 
 +
                   
 +
     error, userOutText        = runModule( module, "input", "userOut" )
 +
    if error:
 +
        commentLong( "- Your program crashed...\n"
 +
                    + "Your program was tested with:\n"
 +
                    + inputLines  + "\n"
 +
                    + "Error message:\n"
 +
                    + userOutText + "\n" )
 +
        printGrade( 50 )
 +
        return
  
−
     #commentLong( "Your program tested with:\n" + inputLines )
+
     dummy, expectedOutText    = runModule( solutionModule, "input", "expectedOut" )
−
    #commentLong( "userOut = \n" + userOutText )
 
−
    #commentLong( "expectedOut = \n" + expectedOutText )
 
  
 
     misMatchLineNumbers = compareUserExpected( inputLines,  
 
     misMatchLineNumbers = compareUserExpected( inputLines,  
Line 1,773: Line 1,843:
  
 
main()
 
main()
−
 
−
 
  
 
</source>
 
</source>

Revision as of 16:08, 21 February 2015

--D. Thiebaut (talk) 15:23, 15 February 2015 (EST)

Make sure you go through the Preparation Page for Homework 4 first, before attempting these programs!



Make sure you use a main() function in all your programs.


Problem #1


Write a program that prompts the user for her first and last name, and outputs a computer account made of the first initial of her first name, plus her last name, all in lowercase.

Example
    First name? Allie
    Last name? BABA
    Your computer account name is: ababa


  • Submit your program to HW 4 PB 1 on Moodle.


Problem #2


Write a program that prompts the user for her first and last name, and outputs a computer account made of the first initial of her first name, plus her last name, all in lowercase. But now we want the computer account to be exactly 8 characters long. If the user names are too short, your program will pad it with the character 'z'.

Example
    First name? Allie 
    Last name? BABA 
    Your computer account name is: ababazzz 

    First name? Al 
    Last name? Gus 
    Your computer account name is:aguszzzz 

    First name? Alma 
    Last name? Verylongname 
    Your computer account name is: averylon


  • Submit your program to HW 4 PB 2 on Moodle.


Problem #3


Write a program that prompts the user for her first and last name, and outputs a computer account made of the first initial of her first name, plus her last name, all in lowercase. We want the computer account to be exactly 8 characters long, but this time it is padded with the current year (2015 for us).

Example
    First name? Allie 
    Last name? BABA 
    Your computer account name is: ababa201 

    First name? Al 
    Last name? Gus 
    Your computer account name is: agus2015 

    First name? Alma 
    Last name? Verylongname 
    Your computer account name is: averylon


  • Submit your program to HW 4 PB 3 on Moodle.


Problem #4


Write a program that prompts the user for her first and last name, and outputs a triangle made with her name, padded with dots in front of it, as illustrated below. There is no limit on the length of the first and last names.

Example
First name? Maria
Last name? LUCE
........M
.......Ma
......Mar
.....Mari
....Maria
...MariaL
..MariaLU
.MariaLUC
MariaLUCE


  • Submit your program to HW 4 PB 4 on Moodle.


Problem #5


Write a program that prompts the user to enter a date in the form mmddyyyy, and displays it back as dd month yyyy, where month is the first 3 letters of the name of the month, in English.

Your program must use the list of months defined as follows: 

 monthNames = ["January", "February", "March", "April", "May", "June", "July", "August",
                       "September", "October", "November", "December"]


Example
Enter date: 02042015

4 Feb 2015


  • Submit your program to HW 4 PB 5 on Moodle.


Problem #6


Write a program that prompts the user to enter a date in the form mmddyyyy, and displays it back as dd month yyyy, where month is the first 3 letters of the name of the month, in English.

Your program must use the string defined as follows, and cannot use the list you used in Problem 5! 

 monthNames = "JanFebMarAprMayJunJulAugSepOctNovDec"


Example
Enter date: 02022015

2 Feb 2015


  • Submit your program to HW 4 PB 6 on Moodle.


Problem #7


Write a program that asks the user for several pieces of information about some famous person, and outputs the information in a nicely formatted box, where the length of the bar of '=' signs before and before the information is the same as the length of the accomplishment information.

Example
Please enter first name: Sophia
Please enter last name:  SMITH
Please enter date of birth (yyyymmdd): 17960827
Please enter date of death( yyyymmdd): 18700602
Please enter accomplishment: Funded Smith College, the largest member of the seven sisters.

==============================================================
Sophia Smith (August 27, 1796 -- June 2, 1870)
Funded smith college, the largest member of the seven sisters.
==============================================================


  • Note that the name is formatted correctly, even if the user enters all uppercase or lowercase letters for the name.
  • Submit your program to HW 4 PB 7 on Moodle.


Note
The bar of '=' signs will not show up correctly on Moodle, because of it uses a proportional font. However, Idle will display the output correctly, so make sure you debug in Idle and use Moodle just for submission. Resist the urge to modify your program in Moodle. Idle is a much friendlier place to edit programs.



<showafterdate after="2015025 00:00">

Solution Programs


# hw4sol.py
# D. Thiebaut
# Solution program(s) for Homework 4, 2015
# The solution organizes the individual solutions
# into functions, but you didn't have to do that for
# solving the problems.
# Just comment out the appropriate line in the the main()
# function to energize the solution for a give problem..

# solution for Problem 1
def problem1():
    fName = input( "Your first name? " )
    lName = input( "Your last name? " )
    full  = fName[0] + lName
    full = full.lower()
    print( full)

# solution for Problem 2
def problem2():
    fName = input( "Your first name? " )
    lName = input( "Your last name? " )
    full  = fName[0] + lName + "zzzzzzzz"
    full = full[0:8].lower()
    print( full)

# solution for Problem 3
def problem3():
    fName = input( "Your first name? " )
    lName = input( "Your last name? " )
    full  = fName[0] + lName + "20152015"
    full = full[0:8].lower()
    print( full)

# solution for Problem 4
def problem4():
    fName = input( "Your first name? " )
    lName = input( "Your last name? " )
    name = fName + lName
    noChars = len( name )
    for i in range( 1, noChars+1 ):
        noSpaces = noChars - i
        spaces = '.' * noSpaces
        print( spaces + name[0:i] )

# solution for Problem 5
def problem5():
    # define the list of months as a list of strings
    monthNames = ["January", "February", "March", "April", 
                  "May", "June", "July", "August",
                  "September", "October", "November", "December"]
    
    # get the date from the user
    date = input( "Enter date: " )

    # extract the different variables from the date
    month = date[0:2]
    day   = date[2:4]
    year  = date[4: ]
    dayInt = int( day )
    monthIndex = int( month ) - 1
    monthStr   = monthNames[ monthIndex ][0:3]

    # display result
    print( dayInt, monthStr, year )


# solution for Problem 6
def problem6():
    # define the list of months as a string of 3-char names
    monthNames = "JanFebMarAprMayJunJulAugSepOctNovDec"

    # get the date from the user
    date = input( "Enter date: " )

    # extract the different variables from the date
    month = date[0:2]
    day   = date[2:4]
    year  = date[4: ]
    dayInt = int( day )
    monthIndex = int( month ) - 1
    monthStr   = monthNames[ monthIndex*3 : monthIndex*3+3]

    # display result
    print( dayInt, monthStr, year )


# solution for Problem 7
def problem7():

    # get the input from the user
    fName   = input( "Enter first name: " )
    lName   = input( "Enter last name:  " )
    dob     = input( "Date of birth (yyyymmdd)" )
    dod     = input( "Date of death (yyyymmdd)" )
    accomp  = input( "Enter accomplishment: " )


    # Figure out the length of the bar
    bar     = "=" * len( accomp )

    # reformat names 
    fName   = fName.capitalize()
    lName   = lName.capitalize()
    accomp  = accomp.capitalize()

    # use a list of strings for the month, to get
    # the correct month for a give number.
    months  = ["January", "February", "March", 
               "April", "May", "June", 
               "July",  "August", "September", 
               "October", "November", "December" ]

    # extract day, month and year from dates.
    dobDay  = int( dob[-2:] )
    dobYear = dob[0:4]
    dobMonth= int( dob[4:6] ) - 1
    dobMonth= months[ dobMonth ]

    dodDay  = int( dod[-2:] )
    dodYear = dod[0:4]
    dodMonth= int( dod[4:6] ) - 1
    dodMonth= months[ dodMonth ]

    # output the result, nicely formatted
    #print()
    print( bar )
    line1 = "{0:1} {1:1} ({2:1} {3:1}, {4:1} -- {5:1} {6:1}, {7:1})"
    print( line1.format( fName, lName, dobMonth, dobDay, dobYear,
                         dodMonth, dodDay, dodYear ) )
    print( accomp )
    print( bar + "\n" )


# main program.
# Calls all the functions that solve the different problems.
# Comment out the lines you want to actually activate the
# function you are interested in.

def main():
    #problem1()
    #problem2()
    #problem3()
    #problem4()
    #problem5()
    #problem6()
    problem7()

main()


</showafterdate>


...











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