统计Python中字符串中出现的次数
在Python中，可以使用内置的count()方法来统计字符串中某个字符或子串出现的次数。
例如，统计字符串s中字符a出现的次数：
s = "aabbcdaa"
char_to_count = "a"
count = s.count(char_to_count)
print(f"{char_to_count} appears {count} times.")如果要统计字符串中子串sub出现的次数：
s = "aabbcdaa"
sub = "aa"
count = s.count(sub)
print(f"{sub} appears {count} times.")这两段代码会分别输出：
a appears 4 times.
aa appears 2 times.
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