counts = {'h': 8882, 'i': 17587, 's': 12948, 'p': 961, 'd': 1046, 'f': 8653, 'e': 15585, 'r': 13755, 'o': 13812, 'n': 25730, 'l': 9090, 'a': 9620, 'm': 736, 't': 14049, 'x': 276, 'g': 4548, 'b': 525, 'y': 359, 'c': 8769, 'k': 122, 'u': 4850, 'v': 294, 'q': 132, 'w': 427, 'j': 62, 'z': 4}
countsLs = list(counts)#直接转换字典，只是转换的键
['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']
countsLs = list(counts.items())#.items()是迭代类型，使用list转换为列表，对比list(map())
[('a', 9620), ('b', 525), ('c', 8769), ('d', 1046), ('e', 15585), ('f', 8653), ('g', 4548), ('h', 8882), ('i', 17587), ('j', 62), ('k', 122), ('l', 9090), ('m', 736), ('n', 25730), ('o', 13812), ('p', 961), ('q', 132), ('r', 13755), ('s', 12948), ('t', 14049), ('u', 4850), ('v', 294), ('w', 427), ('x', 276), ('y', 359), ('z', 4)]
countsLs = list(counts)#直接转换字典，只是转换的键
countsLs = list(counts.items())#.items()是迭代类型，使用list转换为列表，对比list(map())
map()返回的也是一种迭代类型，也需要通过list转换为列表类型
