官方解释：Return a copy of the string with its first character capitalized and the rest lowercased.（返回字符串的副本，其首字符大写，其余字符小写。）
>>> s1 = ‘python最牛掰‘ >>> ret1 = s1.capitalize() >>> print(ret1) Python最牛掰
String的方法capitalize
原文：https://www.cnblogs.com/lcfzh/p/10034065.html
