Python - 在嵌套字典中查找最大值

Question

您好，我是 Python 新手，在從嵌套字典生成最大值時遇到了一些問題。

原始字典：

gradebooks = {'business analytics': {'Alice': 95, 'Troy': 92}, 'Python programming': {'James': 89, 'Charles': 100, 'Bryn': 69, 'Alice': 100}, 'R programming': {'Troy': 93, 'James': 100, 'Charles': 88}}

我要生成的新字典：

{'business analytics': 95, 'Python programming': 100, 'R programming': 100}

我使用了以下代碼但無法生成最大值：

ISOM_gradebooks = {course: v for course, name in gradebooks.items() for key, v in name.items()}
print(ISOM_gradebooks)

有什么解決辦法，謝謝。

Answer 1

>>> {key: max(value.values()) for key, value in gradebooks.items()}
{'business analytics': 95, 'Python programming': 100, 'R programming': 100}

Answer 2

你可以試試這個來獲得每個類別的最大值：

outputDict = {}

# This will loop on each key and value of your gradebooks dictionary
for k,v in gradebooks.items()
    maxVal = 0
    # This will loop over the grades of each student
    for grade in v.values():
        if grade > maxVal:
            maxVal = grade
    # Update your dictionary with the value of the maxVal of your subject k
    outputDict[k] = maxVal

讓我知道這是否有幫助！