IPython:将 Python 脚本的输出重定向到文件(如 bash >) [英] IPython: redirecting output of a Python script to a file (like bash >)
问题描述
我有一个要在 IPython 中运行的 Python 脚本.我想将输出重定向(写入)到一个文件,类似于:
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.txt
当我在 IPython 中运行脚本时,我该怎么做,例如 execfile('my_script.py')
How do I do this when I run the script in IPython, i.e. like execfile('my_script.py')
有一个 旧页面 描述了可以编写函数来执行此操作,但我相信现在有一种内置的方法可以执行此操作,但我找不到.
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.
推荐答案
IPython 有自己的 捕获标准输出/错误,但它不会重定向到文件,而是重定向到一个对象:
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 script
并且此功能在 %%capture
单元魔术中公开,如 Cell Magics 示例笔记本.
And this functionality is exposed in a %%capture
cell-magic, as illustrated in the Cell Magics example notebook.
这是一个简单的上下文管理器,因此您可以编写自己的版本来重定向到文件:
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_stderr
你会用它来调用:
with redirect_output("my_output.txt"):
%run my_script.py
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