45 lines
1.2 KiB
Python
45 lines
1.2 KiB
Python
#!/usr/bin/env python
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# -*- encoding: utf-8 -*-
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"""
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Topic: 字典的数据运算
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Desc :
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"""
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def calc_dict():
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prices = {
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'ACME': 45.23,
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'AAPL': 612.78,
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'IBM': 205.55,
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'HPQ': 37.20,
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'FB': 10.75
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}
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min_price = min(zip(prices.values(), prices.keys()))
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# min_price is (10.75, 'FB')
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max_price = max(zip(prices.values(), prices.keys()))
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# max_price is (612.78, 'AAPL')
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prices_sorted = sorted(zip(prices.values(), prices.keys()))
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# prices_sorted is [(10.75, 'FB'), (37.2, 'HPQ'),
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# (45.23, 'ACME'), (205.55, 'IBM'),
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# (612.78, 'AAPL')]
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prices_and_names = zip(prices.values(), prices.keys())
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print(min(prices_and_names)) # OK
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print(max(prices_and_names)) # ValueError: max() arg is an empty sequence
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min(prices) # Returns 'AAPL'
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max(prices) # Returns 'IBM'
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min(prices, key=lambda k: prices[k]) # Returns 'FB'
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max(prices, key=lambda k: prices[k]) # Returns 'AAPL'
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min_value = prices[min(prices, key=lambda k: prices[k])]
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prices = { 'AAA' : 45.23, 'ZZZ': 45.23 }
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min(zip(prices.values(), prices.keys()))
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# (45.23, 'AAA')
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max(zip(prices.values(), prices.keys()))
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# (45.23, 'ZZZ')
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