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大家好，我想请问一下:
如何统计数据集中某个词的总频数? 这个词可能出现在任何一个column.
比如下面这个数据集:
| Film | Director | Producer | Starring | Release |
| Fight Club | David Fincher | Art Linson | Brad Pitt | 1999 |
| The Departed | Brad Pitt | Leonardo DiCaprio | 2006 | |
| World War Z | Marc Forster | Brad Pitt | Brad Pitt | 2013 |
| 12 Years a Slave | Steve McQueen | Brad Pitt | Chiwetel Ejiofor | 2013 |
| The Aviator | Martin Scorsese | Michael Mann | Leonardo DiCaprio | 2004 |
| Blood Diamond | Edward Zwick | Leonardo DiCaprio | 2006 | |
| The Wolf of Wall Street | Martin Scorsese | Leonardo DiCaprio | 2013 | |
| Brad Pitt | Moneyball | 2011 | ||
| Sleepy Hollow | Tim Burton | Scott Rudin | Johnny Depp | 1999 |
| Pirates of the Caribbean: Dead Man's Chest | Gore Verbinski | Jerry Bruckheimer | Johnny Depp | 2006 |
如何统计 “Brad Pitt” 这个词的出现次数?
列的名字是没有规律的, 观测数是不确定的
谢谢！
film_data
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