IPython:如何将内容输入Python脚本 [英] IPython: how do I pipe something into a Python script
问题描述
我知道我可以通过运行test.py
在IPython中运行脚本并从那里进行调试。
I understand I can run a script in IPython via run test.py
and debug from there.
但是如何将输出传输到test.py?例如,通常我可以在命令行中运行,如 grepABCinput.txt | ./test.py
,但我如何在IPython中做同样的事情?
But how do I pipe an output into test.py? For example, normally I could run in the command line like grep "ABC" input.txt | ./test.py
, but how do I do the same thing in IPython?
谢谢!
推荐答案
在Python脚本中你应该从sys.stdin中读取:
Inside the Python script you should be reading from sys.stdin:
import sys
INPUT = sys.stdin
def do_something_with_data(line):
# Do your magic here
...
return result
def main():
for line in INPUT:
print 'Result:', do_something_with_data(line)
if __name__ == '__main__':
main()
在迭代解释器中,您可以使用子进程模块模拟sys.stdin。
Inside the iterative interpreter you can use the subprocess module mock sys.stdin.
In[0]: from test.py import *
In[1]: INPUT = subprocess.Popen(['grep', 'ABC', 'input.txt'], \
stdout=subprocess.PIPE).stdout
In[2]: main()
您还可以将输出传输到文件,只需从文件中读取即可。出于实际目的,stdin只是另一个文件。
You can also pipe the output to a file and just read from the file. For practical purposes stdin is just another file.
In[0]: ! grep "ABC" input.txt > output.txt
In[1]: INPUT = open('output.txt')
In[2]: main()
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