如何捕获 ipython shell 的错误输出？

发布于 2024-08-01 22:23:57 字数 221 浏览 11 评论 0原文

我正在编写一个 ipython 宏来处理程序的输出。问题是，程序有时可以写入 stderr ，所以如果我这样做：


out = !my_program

out 变量将不包含输出。我认为它将包含退出代码（如果我错了，请纠正我）。

如何捕获 stdout 和 stderr 流？

原文

I'm writing an ipython macro that processes the output of a program. The thing is, the program can sometimes write to stderr , so if I do something like this :


out = !my_program

the out variable will not contain the output. I think it will contain the exit code ( correct me if I'm wrong ).

How can I capture both stdout and stderr streams?

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℉服软 2024-08-08 22:23:57

foo 2>&1 表示将所有输出，包括句柄 2（即 STDERR），从 foo 命令重定向到句柄 1（即 STDOUT）
所以这里 out = !foo 2>&1 也许就足够了。下面是演示：
Egg.py：IPython

#!/usr/bin/env python
# -*- coding: utf8 -*-
def main():
    print 'hello'
    print 3/0
if __name__ == "__main__":
    main()

0.10

In [5]: out = !egg.py
Traceback (most recent call last):
  File "D:\python\note\egg.py", line 7, in <module>
    main()
  File "D:\python\note\egg.py", line 5, in main
    print 3/0
ZeroDivisionError: integer division or modulo by zero

In [6]: out
Out[6]: SList (.p, .n, .l, .s, .grep(), .fields(), sort() available):
0: hello

In [7]: out = !egg.py 2>&1

In [8]: out
Out[8]: SList (.p, .n, .l, .s, .grep(), .fields(), sort() available):
0: hello
1: Traceback (most recent call last):
2:   File "D:\python\note\egg.py", line 7, in <module>
3:     main()
4:   File "D:\python\note\egg.py", line 5, in main
5:     print 3/0
6: ZeroDivisionError: integer division or modulo by zero

希望这有帮助

foo 2>&1 means redirect all of the output, including handle 2 (that is, STDERR), from the foo command to handle 1 (that is, STDOUT)
so here out = !foo 2>&1 maybe good enough. below is the demo:
egg.py:

#!/usr/bin/env python
# -*- coding: utf8 -*-
def main():
    print 'hello'
    print 3/0
if __name__ == "__main__":
    main()

IPython 0.10

In [5]: out = !egg.py
Traceback (most recent call last):
  File "D:\python\note\egg.py", line 7, in <module>
    main()
  File "D:\python\note\egg.py", line 5, in main
    print 3/0
ZeroDivisionError: integer division or modulo by zero

In [6]: out
Out[6]: SList (.p, .n, .l, .s, .grep(), .fields(), sort() available):
0: hello

In [7]: out = !egg.py 2>&1

In [8]: out
Out[8]: SList (.p, .n, .l, .s, .grep(), .fields(), sort() available):
0: hello
1: Traceback (most recent call last):
2:   File "D:\python\note\egg.py", line 7, in <module>
3:     main()
4:   File "D:\python\note\egg.py", line 5, in main
5:     print 3/0
6: ZeroDivisionError: integer division or modulo by zero

Hope this helps

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