[英]How to debug external .py functions run from Jupyter/IPython notebook
[英]Run MRJob from IPython notebook
我試圖從IPython筆記本運行mrjob示例
from mrjob.job import MRJob
class MRWordFrequencyCount(MRJob):
def mapper(self, _, line):
yield "chars", len(line)
yield "words", len(line.split())
yield "lines", 1
def reducer(self, key, values):
yield key, sum(values)
然后用代碼運行它
mr_job = MRWordFrequencyCount(args=["testfile.txt"])
with mr_job.make_runner() as runner:
runner.run()
for line in runner.stream_output():
key, value = mr_job.parse_output_line(line)
print key, value
並得到錯誤:
TypeError: <module '__main__' (built-in)> is a built-in class
有沒有辦法從IPython筆記本運行mrjob?
我還沒有找到“完美的方式”,但你可以做的一件事是創建一個筆記本單元格,使用%%file
魔術,將單元格內容寫入文件:
%%file wordcount.py
from mrjob.job import MRJob
class MRWordFrequencyCount(MRJob):
def mapper(self, _, line):
yield "chars", len(line)
yield "words", len(line.split())
yield "lines", 1
def reducer(self, key, values):
yield key, sum(values)
然后讓mrjob
在稍后的單元格中運行該文件:
import wordcount
reload(wordcount)
mr_job = wordcount.MRWordFrequencyCount(args=['example.txt'])
with mr_job.make_runner() as runner:
runner.run()
for line in runner.stream_output():
key, value = mr_job.parse_output_line(line)
print key, value
請注意,我調用了我的文件wordcount.py
並從wordcount
模塊導入了類MRWordFrequencyCount
- 文件名和模塊必須匹配。 Python也會緩存導入的模塊,當你更改wordcount.py
文件時,iPython不會重新加載模塊,而是使用舊的緩存模塊。 這就是我把reload()
調用放在那里的原因。
參考: https : //groups.google.com/d/msg/mrjob/CfdAgcEaC-I/8XfJPXCjTvQJ
更新(更短)
對於較短的第二個筆記本單元,您可以通過從筆記本中調用shell來運行mrjob
! python mrjob.py shakespeare.txt
參考: http ://jupyter.cs.brynmawr.edu/hub/dblank/public/Jupyter%20Magics.ipynb
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