Question

Give Music would like you to write a program that prints a summary of the albums in a given file. You should write a program that does the following Prompts the user to enter a file name o Use the prompt 'Enter a data file name:' lf the user enters an invalid file name then print ' Invalid File Name Entered! ' and ask the user to enter a file name using the original prompt. o Keep asking until the user has entered a valid file name .Reads the album data into the program as a list of lines. Processes the list of lines to extract all the albums as a dictionary . Prints a table as follows: o Print a newline o Print a title for the table: Album Catalogue Summary o Print a separator of 35-characters o Print a line with the column headings ID and 'ALBUM NAME' in the appropriate places (see format string below) o Print a row for each album filling the columns, sorted by album ids. Use the format string below to get the columns lined up as required. Notes This format string may be of use:<5): <30)' The input data files contain sales sections which should be ignored at this stage .At the start of your program you should include the line import os You can use os.path.isfile (filename) to check if a file name is valid-see super-quiz 3 For example: Input Result album0.txt Enter a data file name: album0.txt Album Catalogue Summary ID ALBUM NAME 70 Enter the Wu_Tang: 36 Cham... 115 Daydream Nation 323 Licensed to 111 414 52nd Street

The code should work exactly the same as given example.

The files:

----------------------------------------------------------------------------------------------------

-------- FILE NAME -------

album0

---------- FILE -------

<album>
323
Licensed to Ill
Beastie Boys
25.0
</album>

<album>
70
Enter the Wu_Tang: 36 Cham...
Wu Tang Clan
25.99
</album>
turning to Alice, she went on, `What's your name, child?'

and there stood the Queen in front of them, with her arms folded,
<album>
115
Daydream Nation
Sonic Youth
5.0
</album>

<album>
414
52nd Street
Billy Joel
25.75
</album>

<sales>
2010-06-09,115,8255
2015-03-15,70,6264
2010-08-09,323,684
2012-01-06,323,7340
2009-01-01,414,13164
2017-04-02,70,3259
2015-06-05,323,2378
2015-03-05,115,9463
2010-12-10,414,12952
2013-05-29,323,1687
2013-04-07,115,1594
2015-10-19,70,1469
2011-10-07,414,10867
2006-04-14,115,5806
2014-11-27,70,9864
2006-08-22,323,7088
2017-12-19,115,5970
2012-04-16,414,16813
2007-05-13,414,11626
2006-09-18,70,2641
2006-12-29,323,5578
</sales>

----------------------------------------------------------------------------------------------------

-------- FILE NAME -------

album1

---------- FILE -------

<album>
445
12 Songs
Randy Newman
20.75
</album>

<album>
291
Cheap Trick at Budokan
Cheap Trick
25.5
</album>
crept a little way out of the wood to listen.
such confusion that she never knew whether it was her turn or

`Why,' said the Dodo, `the best way to explain it is to do it.'
<album>
207
Good Old Boys
Randy Newman
35.5
</album>

<album>
216
All the Young Dudes
Mott the Hoople
25.0
</album>
Some of the birds hurried off at once: one old Magpie began
<sales>
2014-08-18,291,3290
2014-12-10,216,8571
2009-08-06,207,4894
2017-12-04,445,774
2010-06-17,207,8012
2016-11-10,291,3851
2012-07-04,291,9997
2016-11-06,445,3866
2012-10-10,216,11404
2016-06-22,216,8393
2016-04-07,207,5836
2014-06-14,216,6707
2017-03-05,216,8164
2017-09-27,445,2956
2017-09-16,216,11508
2012-12-08,216,7101
2008-06-07,207,6340
2012-05-31,207,502
2007-11-13,216,11664
2015-04-24,445,3185
2018-05-10,291,3470
2018-01-29,445,1513
2015-02-22,291,5345
2007-08-26,207,1916
</sales>

----------------------------------------------------------------------------------------------------

-------- FILE NAME -------

album2

---------- FILE -------

<album>
462
Fresh Cream
Cream
10.0
</album>

<album>
273
Gris-Gris
Dr. John, the Night Tripper
20.95
</album>

<album>
15
(pronounced 'leh-'nerd 'sk...
Lynyrd Skynyrd
20.75
</album>
(`I only wish it was,' the March Hare said to itself in a
<album>
156
The Paul Butterfield Blues...
The Paul Butterfield Blues...
5.1
</album>
Alice sighed wearily. `I think you might do something better
<album>
124
Voodoo
D'Angelo
35.99
</album>
angrily.
mouse, That he
`but a grin without a cat! It's the most curious thing I ever
those serpents! There's no pleasing them!'
<album>
349
"Love and Theft"
Bob Dylan
35.0
</album>
by an occasional exclamation of `Hjckrrh!' from the Gryphon, and

They very soon came upon a Gryphon, lying fast asleep in the
Alice said nothing: she had never been so much contradicted in
<album>
208
Raising Hell
Run D.M.C.
35.5
</album>

<sales>
2006-07-28,124,7749
2011-10-08,273,1351
2013-05-09,273,2592
2015-12-10,124,5853
2013-03-04,208,56195
2015-08-23,156,1550
2009-09-10,462,3238
2008-03-22,349,1005
2018-06-28,156,2547
2009-04-14,156,4419
2008-05-16,156,6108
2014-06-13,124,4156
2007-11-02,208,57926
2006-06-13,156,1416
2006-12-01,349,3141
2015-05-05,15,1580
2011-11-13,208,57862
2007-08-10,462,2103
2013-09-22,462,3746
2012-03-29,349,1205
2009-06-23,156,3210
2017-11-17,349,5136
2019-02-26,208,58573
2017-06-13,208,58446
2018-11-04,15,5519
2012-11-03,273,3937
2008-02-22,124,1750
2008-02-27,15,5218
2014-09-01,124,7828
2008-02-17,349,120
2007-10-11,208,57721
2010-01-30,462,4770
2006-08-30,15,2399
2007-02-11,462,1253
2009-05-20,15,68
2010-05-02,15,2229
2010-02-23,208,56622
2008-07-08,462,4857
2009-03-26,349,46
2009-03-08,208,57068
2014-12-01,15,3642
2012-09-11,156,5609
2018-01-10,349,2888
2017-12-04,208,58171
2015-06-12,273,2636
2018-03-07,124,6244
2012-03-11,462,2709
2014-12-29,273,6484
2012-01-18,462,2856
2007-09-21,156,2229
2006-11-10,273,1665
2015-03-09,349,5114
2009-10-27,15,6213
2017-12-08,349,2926
</sales>

Answer 1

SOURCE CODE:

import os    #importing os module
while(True):
    file=input("Enter a data file name: ")   #reading file name from user
    t=os.path.isfile(file)   #this statement is used to check entered string is file or not
    if(t==True):    #if it is file
        f=open(file,'r') #opening file in read mode
        line=f.readline()
        l=[]
        album_dictionary={}
        while line:     #logic for reading line in line by line
            line=line.rstrip('\n') #deleting ending '\n' character from the line
            l.append(line) #appending line to list l
            line=f.readline() #reading line
        ind=l.index('<sales>') #finding index of '<sales>'
        del l[ind:len(l)]    #deleting sales section in the list
        for i in range(len(l)):
            if(l[i]=='<album>'):
                album_dictionary.update({int(l[i+1]):l[i+2]}) #adding album id and album name to album_dictionary
        print()         #printing new line
        print("Album Catalogue Summary") #printing "Album Catalogue Summary"
        s='-'
        fs='{:<5}{:<30}' #string for formating output
        print(35*s)   #printing 35 '-' characters
        print(fs.format("ID","ALBUM NAME"))   #printing ID and ALBUM NAME with appropriate format string
        for k in sorted(album_dictionary.keys()):
            print(fs.format(k,album_dictionary[k]))    #logic for printing ID AND NAME in sorted order
        break  
    else:    #if it is not file
        print("Invalid File Name Entered!")

CODE SCREENSHOT:

1 import os #importing os module 2 while (True): file-input ("Enter a data file name : ") #reading file name from user t os.path. ísfile(file) #this statement is used to check entered string is file or not if (t:-True): f-ope (file,' r') line-f.readline( 4. #if it is file #opening file in read mode 5- 6 album_dictionary ( while line: 9 #Logic for reading Line in Line by Line 10- line line.rstrip('\n.) #deleting ending '\n' character from the Line .append(line) #appending line to list L line f.readline() #reading line ind I. index( 'csales»') #finding index of '<sales»-| del l[ind : le: (1)] #deleting sales section in the list for i in range(L (1)): 12 13 15 16 album-dictionary. update({n #printing new line print( "Album Catalogue Summary") (1[i+1]):1[i+2])) #adding album id and album name albun_dictionary to 19 print 20 #printing "Album Catalogue Summary" fs-"(:<5){ : < 30). #string for formating output print(35"S) #printing 35'-'characters print(fs. format("TD","ALBUM NAME")) #printing ID and ALBUM NAME with appropriate format string for k in sorted(album_dictionary.keys )): print (fs. format (k, album-dictionary[k])) #logic for printing ID AND NAME in sorted order 23 24 25- 26 break 27 Activat else: #if it is not file print("Invalid File Name Entered!") 28- Go to Set

OUTPUT:

Invalid File Name Entered! Enter a data file name: album0.txt Album Catalogue Summary ID ALBUM NAME 70 Enter the Wu_Tang: 36 Cham.. 115 Daydream Nation 323 Licensed to Ill 414 52nd Street Program finished with exit code0

Enter a data file name album1.txt Album Catalogue Summary ID ALBUM NAME 207 Good Old Boys 216 All the Young Dudes 291 Cheap Trick at Budokan 445 12 Songs Program finished with exit code0