如何在Python中查找字典中的最大值键[重复]

Question

我很难理解下面的代码是如何在字典中找到最大值的键的。我知道第一个参数my_dict.keys()返回键列表。但我没有得到第二个参数..帮帮我

key_max = max(my_dict.keys(), key=(lambda k: my_dict[k]))

Answer 1

所以，这归结为：

# Your key is what you use to compare
key_value_finder = lambda x: my_dict[x]
test_val = 0
sought_key = None

# All that max is doing is iterating through the list like this
for k in my_dict.keys():

    # Taking the value returned by the `key` param (your lambda)
    tmp_val = key_value_finder(k)

    # And retaining it if the value is higher than the current cache.
    if tmp_val > test_val:
         test_val = tmp_val
         sought_key = k