摘要：
1.python字符串通常有单引号（'...'）、双引号（"..."）、三引号（"""..."""）或（'''...'''）包围，三引 号包含的字符串可由多行组成，一般可表示大段的叙述性字符串。在使用时基本没有差别，但双引号和三引号（"""..."""）中可以包含单引号，三引号 ('''...'''... 阅读全文
摘要：
Stocks were up for a second straight day.（连续两天）However, one has to wonder if there is a false sense of security allowing this to happen.（错误的安全感）You se... 阅读全文
摘要：
1. there are stocks that get beaten up, give a pause at or near the bottom and then begin to head back higher. These stocks generally have something i... 阅读全文