我的代码正在输出一个值元组，我希望它是单独的成对的，我需要帮助来了解如何修改它

Question

def mapper(self, _, line):
stop_words = set(["to", "a", "an", "the", "for", "in", "on", "of", "at", "over", "with", "after", "and", "from", "new", "us", "by", "as", "man", "up", "says", "in", "out", "is", "be", "are", "not", "pm", "am", "off", "more", "less", "no", "how"])
(date,words) = line.strip().split(",")
word_list = words.split()
clean_words = [word for word in word_list if word not in stop_words]
clean_words.sort()

yield (date[0:4],clean_words)

这是在MRJob映射程序中。当前输出看起来像

"2003" ["word 1","word 2", "word 3", "word 4"]
"2004" ["word 1","word 2", "word 3", "word 4"]

我希望它是：

"2003" "Word 1"
"2003" "Word 2"
"2004" "Word 3"
"2004" "Word 4"

一旦它像这样输出，我就可以发送到reducer，对年份和前3个单词进行计数

Answer 1

使用循环分别生成每个单词。

def mapper(self, _, line):
stop_words = set(["to", "a", "an", "the", "for", "in", "on", "of", "at", "over", "with", "after", "and", "from", "new", "us", "by", "as", "man", "up", "says", "in", "out", "is", "be", "are", "not", "pm", "am", "off", "more", "less", "no", "how"])
(date,words) = line.strip().split(",")
word_list = words.split()
clean_words = [word for word in word_list if word not in stop_words]
clean_words.sort()
for word in clean_words:
yield (date[0:4],word)