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Stack In Python

class Stack: def __init__(self): self.stack = [] def add(self, dataval): # Use list append method to add element if dataval not in self.stack: self.stack.append(dataval) return True else: return False # Use peek to look at the top of the stack def peek(self): return self.stack[-1] AStack = Stack() AStack.add("Mon") AStack.add("Tue") AStack.peek() print(AStack.peek()) AStack.add("Wed") AStack.add("Thu") print(AStack.peek())

80/20 Rule - Pareto Principle


Originally, the Pareto Principle referred to the observation that 80% of Italy’s wealth belonged to only 20% of the population.

More generally, the Pareto Principle is the observation (not law) that most things in life are not distributed evenly. It can mean all of the following things:

  • 20% of the input creates 80% of the result
  • 20% of the workers produce 80% of the result
  • 20% of the customers create 80% of the revenue
  • 20% of the bugs cause 80% of the crashes
  • 20% of the features cause 80% of the usage
  • And on and on…

But be careful when using this idea! First, there’s a common misconception that the numbers 20 and 80 must add to 100 — they don’t!

Also recognize that the numbers don’t have to be “20%” and “80%” exactly. The key point is that most things in life (effort, reward, output) are not distributed evenly – some contribute more than others.

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Stack In Python

class Stack: def __init__(self): self.stack = [] def add(self, dataval): # Use list append method to add element if dataval not in self.stack: self.stack.append(dataval) return True else: return False # Use peek to look at the top of the stack def peek(self): return self.stack[-1] AStack = Stack() AStack.add("Mon") AStack.add("Tue") AStack.peek() print(AStack.peek()) AStack.add("Wed") AStack.add("Thu") print(AStack.peek())

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