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  1. #
  2. class arraystack:
  3.     def __init__(self):
  4.         self.data=[]
  5.     def __len__(self):
  6.         return len(self.data)
  7.     def is_empty(self):
  8.         return len(self.data)==0  
  9.     def push(self,e):
  10.         self.data.append(e)
  11.     def top(self):
  12.         if self.is_empty():
  13.             raise Exception('stack is empty') 
  14.         else :
  15.             return self.data[-1]
  16.     def pop(self):
  17.         if self.is_empty():
  18.             raise Exception('stack is empty') 
  19.         else:
  20.             self.data.pop();   
  21.  
  22.  
  23. s = arraystack()
  24. s.push(10)
  25. s.push(20)
  26. print("Top of stack:", s.top())  # المفروض تطبع 20
  27. s.pop()
  28. print("Top after pop:", s.top())  # المفروض تطبع 10
  29. print("Length of stack:", len(s))  # المفروض تطبع 1
  30. print("Is empty?", s.is_empty())  # المفروض تطبع False
  31. s.pop()
  32. print("Is empty after popping all?", s.is_empty())  # المفروض تطبع True
  33.  
Success #stdin #stdout 0.02s 7140KB
comments (?)
stdin
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Standard input is empty
stdout
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('Top of stack:', 20)
('Top after pop:', 10)
('Length of stack:', 1)
('Is empty?', False)
('Is empty after popping all?', True)
https://ideone.com/uyHp21
language:
Python (cpython 2.7.16)
created:
1 day ago
visibility:
public

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