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  1. class PaginationHelper:
  2.  
  3.     def __init__(self, collection, items_per_page):
  4.         '''The constructor takes in an array of items and a integer indicating
  5.         how many items fit within a single page'''
  6.         self.collection = collection
  7.         '''Given array'''
  8.         self.items_per_page = items_per_page
  9.         '''Given number of items that should be on a single page'''
  10.         self.result = [self.collection[i:i + self.items_per_page]
  11.                   for i in range(0, len(self.collection), self.items_per_page)]
  12.         '''An array that orders our collection'''
  13.  
  14.     def item_count(self):
  15.         '''Returns the number of items within the entire collection'''
  16.         return len(self.collection)
  17.  
  18.     def page_count(self):
  19.         '''Returns the number of pages'''
  20.         return m.ceil(len(self.collection) / self.items_per_page)
  21.  
  22.     def page_item_count(self, page_index):
  23.         '''Returns the number of items on the current page. page_index is zero based.
  24.         This method should return -1 for page_index values that are out of range.'''
  25.         self.page_index = page_index
  26.         try:
  27.             return len(self.result[page_index])
  28.         except IndexError:
  29.             return -1
  30.  
  31.     def page_index(self, item_index):
  32.         '''Determines what page an item is on. Zero based indexes.
  33.         This method should return -1 for item_index values that are out of range'''
  34.         self.item_index = item_index
  35.         if item_index not in range(len(self.collection)):
  36.             return -1
  37.         item = self.collection[item_index]
  38.         for index, list_of_elements in enumerate(self.result):
  39.             if item in list_of_elements:
  40.                 return index
  41.             else:
  42.                 continue
  43.  
  44.  
  45. collection = [3, 1, 6, 'g', 5, [], (), 0, 'sdf']
  46. helper = PaginationHelper(collection, 2)
  47.  
  48. print(helper.collection)
  49. print(helper.result)
  50. print(helper.page_index(0))
Success #stdin #stdout 0.04s 8992KB
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[3, 1, 6, 'g', 5, [], (), 0, 'sdf']
[[3, 1], [6, 'g'], [5, []], [(), 0], ['sdf']]
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https://ideone.com/j7PNFL
language:
Python 3 (python  3.12)
created:
2 years ago
visibility:
secret

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