翻译强力驱动I have a Python script that I want to run in IPython. I want to redirect (write) the output to a file, similar to:
python my_script.py > my_output.txtHow do I do this when I run the script in IPython, i.e. like execfile('my_script.py')
There is an older page describing a function that could be written to do this, but I believe that there is now a built-in way to do this that I just can't find.
IPython has its own context manager for capturing stdout/err, but it doesn't redirect to files, it redirects to an object:
from IPython.utils import io with io.capture_output() as captured: %run my_script.py print captured.stdout # prints stdout from your scriptAnd this functionality is exposed in a %%capture cell-magic, as illustrated in the Cell Magics example notebook.
It's a simple context manager, so you can write your own version that would redirect to files:
class redirect_output(object): """context manager for reditrecting stdout/err to files""" def __init__(self, stdout='', stderr=''): self.stdout = stdout self.stderr = stderr def __enter__(self): self.sys_stdout = sys.stdout self.sys_stderr = sys.stderr if self.stdout: sys.stdout = open(self.stdout, 'w') if self.stderr: if self.stderr == self.stdout: sys.stderr = sys.stdout else: sys.stderr = open(self.stderr, 'w') def __exit__(self, exc_type, exc_value, traceback): sys.stdout = self.sys_stdout sys.stderr = self.sys_stderrwhich you would invoke with:
with redirect_output("my_output.txt"): %run my_script.pyWriting a script seemed overkill for me, as I just wanted something simple to look at a lot of text contained in a variable while working in IPython. This is what worked for me:
%store VARIABLE >> file.txt (appends) %store VARIABLE > file.txt (overwrites)
There's the hacky way of overwriting sys.stdout and sys.stderr with a file object, but that's really not a good way to go about it. Really, if you want to control where the output goes from inside python, you need to implement some sort of logging and/or output handling system that you can configure via the command line or function arguments instead of using print statements.
It seems a lot of code.... My solution. redirect output of ipython script into a csv or text file like sqlplus spool wonder there is an easy way like oracle sqlplus spool command..?