按自定义函数排序

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a = [2, 1, 3]
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b = sorted(a) # 不改变 a
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a.sort() # 改变 a
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a.sort(reverse=True)
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# 按自定义函数排序
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programming_languages = ["Python", "Swift","Java", "C++", "Go", "Rust"]
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programming_languages.sort(key=len)
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programming_languages.sort(key=len, reverse=True)
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# 按自定义函数排序
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programming_languages = [{'language':'Python','year':1991},
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{'language':'Swift','year':2014},
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{'language':'Java', 'year':1995},
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{'language':'C++','year':1985},
9 collapsed lines
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{'language':'Go','year':2007},
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{'language':'Rust','year':2010},
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]
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def get_year(element):
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    return element['year']
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programming_languages.sort(key=get_year)
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programming_languages.sort(key=get_year, reverse=True)