Beginners help!

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Beginners help!

 
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  #1
Sep 3rd, 2009
Hi all

I'm needing help with a question in my tutorial due tomorrow...

I'm given this file which contains the following:

toy201, Racing Car, AB239:2,DC202:2,FR277:2,JK201:1,YU201:1,EE201:1,FW201:1
toy101, Barbie Doll, AB139:2,DC102:2,FR177:2,JK101:1,YU101:1,EE101:1,FW101:1
toy301, Flying Kite, AB339:2,DC302:2,FR377:2,JK301:1,YU301:1,EE301:1,FW301:1

I am now to define a function that gives the following from the above file:

>>>load_prods(filename)
{'toy301': ('Flying Kite', [('AB339',2),('DC302',2),('FR377',2),('JK301),1),('YU301',1),('EE301',1),('FW301),1)])

.......(and the same for barbie doll and flying kite)........ }

Any help would be greatly appreciated...
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Re: Beginners help!

 
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  #2
Sep 3rd, 2009
i find (as far as i saw) u need a change after a comma(,).We will read the file character by character .When we encounter a comma we will go back and print the word..'word',n..something like this
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Re: Beginners help!

 
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  #3
Sep 3rd, 2009
A nice brain teaser to get to know Python, here are some hints:
python Syntax (Toggle Plain Text) 
  1. """wants dictionary object -->
  2. {'toy301': ('Flying Kite', [('AB339',2),('DC302',2),('FR377',2),
  3. ('JK301),1),('YU301',1),('EE301',1),('FW301),1)])}
  4. """
  5.  
  6. # typical data line from a file
  7. line = """\
  8. toy301, Flying Kite, AB339:2,DC302:2,FR377:2,JK301:1,YU301:1,EE301:1,FW301:1
  9. """
  10.  
  11. # first split the line at the commas
  12. list1 = line.split(",")
  13. print(list1)
  14.  
  15. """result -->
  16. ['toy301', ' Flying Kite', ' AB339:2', 'DC302:2', 'FR377:2',
  17. 'JK301:1', 'YU301:1', 'EE301:1', 'FW301:1\n']
  18. """
  19.  
  20. # next create a list of tuples from items that have ':'
  21. tuple_list = []
  22. for item in list1:
  23.     # strip off trailing newline
  24.     line = line.rstrip()
  25.     if ':' in item:
  26.         text, num = item.split(":")
  27.         tuple_list.append((text, int(num)))
  28.  
  29. print(tuple_list)
  30.  
  31. """result -->
  32. [(' AB339', 2), ('DC302', 2), ('FR377', 2), ('JK301', 1),
  33. ('YU301', 1), ('EE301', 1), ('FW301', 1)]
  34. """
  35.  
  36. # now you are ready to piece together the dictionary object from
  37. # parts in list1 and the tuple_list
drink her pretty
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Re: Beginners help!

 
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  #4
Sep 3rd, 2009
Okay so I have:

python Syntax (Toggle Plain Text) 
  1. def load_products(filename):
  2. 	filename = 'C:\Users\User\Desktop\cssetute\products.txt'
  3. 	f = open(filename, 'U')
  4. 	dictionary={}
  5. 	for line in f:
  6. 		list1 = line.strip().split(',')
  7. 	tuple_list=[]
  8. 	for item in list1:
  9. 		line = line.rstrip()
  10. 		if ':' in item:
  11. 			text, num = item.split(":")
  12. 			tuple_list.append((text, int(num)))
  13. 	dictionary[list1[0]] = tuple_list
  14.         f.close()
  15.  
  16.         return dictionary

But when i load_products('products.txt') it comes up with:

{'toy301': [(' AB339',2),('DC302',2),('FR377',2),('JK301),1),('YU301',1),('EE301',1),('FW301),1)]}

...
The name of the toy is missing and only one line comes up when I need the whole three toy lines to come up.

Help thanks!
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Re: Beginners help!

 
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  #5
Sep 4th, 2009
You are almost there, you need to indent properly to keep your statement blocks together ...
python Syntax (Toggle Plain Text) 
  1. def load_products(filename):
  2.     #filename = 'C:\Users\User\Desktop\cssetute\products.txt'
  3.     f = open(filename, 'r')
  4.     dictionary = {}
  5.     for line in f.readlines():
  6.         list1 = line.strip().split(',')
  7.         tuple_list = []
  8.         for item in list1:
  9.             line = line.rstrip()
  10.             if ':' in item:
  11.                 text, num = item.split(":")
  12.                 tuple_list.append((text, int(num)))
  13.         # build the dictionary
  14.         dictionary[list1[0]] = (list1[1], tuple_list)
  15.     f.close()
  16.     return dictionary
  17.  
  18. my_dict = load_products('products.txt')
  19. print(my_dict)
  20.  
  21. """my output (made somewhat pretty) -->
  22. {'toy301': (' Flying Kite', 
  23. [(' AB339', 2), ('DC302', 2), ('FR377', 2), ('JK301', 1), 
  24. ('YU301', 1), ('EE301', 1), ('FW301', 1)]),
  25. 'toy201': (' Racing Car', 
  26. [(' AB239', 2), ('DC202', 2), ('FR277', 2), 
  27. ('JK201', 1), ('YU201', 1), ('EE201', 1), ('FW201', 1)]),
  28. 'toy101': (' Barbie Doll', 
  29. [(' AB139', 2), ('DC102', 2), ('FR177', 2), 
  30. ('JK101', 1), ('YU101', 1), ('EE101', 1), ('FW101', 1)])}
  31. """
Make sure you don't use tabs for indents!
May 'the Google' be with you!
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Re: Beginners help!

 
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  #6
Sep 4th, 2009
Add some print statements to see what is going on
Python Syntax (Toggle Plain Text) 
  1. def load_products(filename):
  2.     filename = 'C:\Users\User\Desktop\cssetute\products.txt'
  3.     f = open(filename, 'U')
  4.     dictionary={}
  5.     for line in f:
  6.         line = line.rstrip()
  7.         list1 = line.strip().split(',')
  8.         print "list1 created =", list1
  9.  
  10.     tuple_list=[]
  11.  
  12.     print "searching list1", list1
  13.     for item in list1:
  14.  
  15.        print "     item =", item
  16.         if ':' in item:
  17.             text, num = item.split(":")
  18.             tuple_list.append((text, int(num)))
  19.             print "     tuple_list =", tuple_list, "\n"
  20.  
  21.     dictionary[list1[0]] = tuple_list
  22.     print "\ndictionary is now", dictionary, "\n"
  23.  
  24.     f.close()
  25.  
  26.     return dictionary
And if it easier to understand, use an additional function.
Python Syntax (Toggle Plain Text) 
  1. def add_to_dictionary(list_in, dictionary):
  2.     tuple_list=[]
  3.  
  4.     for item in list_in:
  5.         if ':' in item:
  6.             text, num = item.split(":")
  7.             tuple_list.append((text, int(num)))
  8.  
  9.     dictionary[list_in[0]] = tuple_list
  10.     return dictionary
  11.  
  12. def load_products(filename):
  13.     filename = 'C:\Users\User\Desktop\cssetute\products.txt'
  14.     f = open(filename, 'U')
  15.     dictionary={}
  16.     for line in f:
  17.         line = line.rstrip()
  18.         list1 = line.strip().split(',')
  19.  
  20.         dictionary = add_to_dictionary(list1, dictionary)
  21.  
  22.     f.close()
Last edited by woooee; Sep 4th, 2009 at 12:55 am.
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Re: Beginners help!

 
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  #7
Sep 4th, 2009
Ahhhh I see, thanks so much everyone! Works perfect now.
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