本篇博客介绍了如何在Python 3中使用字典记录字符串中字符出现次数。首先创建了一个名为d的字典，记录了字符串placement中每个字符的出现频率，并找到字典中值最小的键(min_value)。接着，通过类似的方法创建lett_d字典，用于统计字符串product中字符的频率，并找出值最大的键(max_value)。
- Create a dictionary called d that keeps track of all the characters in the string placement and notes how many times each character was seen. Then, find the key with the lowest value in this dictionary and assign that key to min_value.
placement = "Beaches are cool places to visit in spring however the Mackinaw Bridge is near. Most people visit Mackinaw later since the island is a cool place to explore."
d = dict()
for char in placement:
if char not in d:
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