006. Python字典排序

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Best stock

一、题目描述

要求：给定货物价格，找到价格最高的货物

输入：一个 货物：价格 的字典

输出：价格最高的货物

示例：

best_stock({
    'CAC': 10.0,
    'ATX': 390.2,
    'WIG': 1.2
}) == 'ATX'
best_stock({
    'CAC': 91.1,
    'ATX': 1.01,
    'TASI': 120.9
}) == 'TASI'

二、 解题示例

1. 遍历字典

def best_stock(data):
    # your code here
    tmp = 0
    good = ''
    for item in data:
        if data[item] > tmp:
            good = item
            tmp = data[item]
    return good


if __name__ == '__main__':
    print("Example:")
    print(best_stock({
        'CAC': 10.0,
        'ATX': 390.2,
        'WIG': 1.2
    }))

    # These "asserts" are used for self-checking and not for an auto-testing
    assert best_stock({
        'CAC': 10.0,
        'ATX': 390.2,
        'WIG': 1.2
    }) == 'ATX', "First"
    assert best_stock({
        'CAC': 91.1,
        'ATX': 1.01,
        'TASI': 120.9
    }) == 'TASI', "Second"

2. max()

def best_stock(data):
    return max(data, key=data.__getitem__)

if __name__ == '__main__':
    print("Example:")
    print(best_stock({
        'CAC': 10.0,
        'ATX': 390.2,
        'WIG': 1.2
    }))

    # These "asserts" are used for self-checking and not for an auto-testing
    assert best_stock({
        'CAC': 10.0,
        'ATX': 390.2,
        'WIG': 1.2
    }) == 'ATX', "First"
    assert best_stock({
        'CAC': 91.1,
        'ATX': 1.01,
        'TASI': 120.9
    }) == 'TASI', "Second"

或者

def best_stock(data):
    return max(data, key=lambda x: data[x])