How to write the output of ipython command in python text file?

Question

I want to capture the output of the following ipython command into a file: commands and outputs areas follows:

`decoder.get_hyp()`

WARNING: "ngram_search.c", line 1000: </s> not found in last frame, using ++NOISE++ instead
INFO: ngram_search.c(1046): lattice start node <s>.0 end node ++NOISE++.171
INFO: ps_lattice.c(1225): Normalizer P(O) = alpha(++NOISE++:171:185) = -2003082
INFO: ps_lattice.c(1263): Joint P(O,S) = -2036704 P(S|O) = -33622
Out[7]: ('WELCOME TO MY TALK', '000000000', -36704586)

I want to capture only the part "wellcome to my talk" into my file.

nonbeing · Accepted Answer · 2020-01-08 05:42:43Z

51

Use the IPython magic function store

%store foo >a.txt # Store (overwrite) value of foo to file a.txt

%store foo >>a.txt # Append value of foo to file a.txt

edited Jan 8, 2020 at 5:42

nonbeing

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answered Sep 23, 2015 at 5:10

Joshua Cook

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4 Comments

Moondra Over a year ago

Is there a way to read it back to a variable in a similar way? Say, I stored a list to a .txt, and I want to read the .txt back to a variable. Thank you.

SeF Over a year ago

you can try with %load. Although the best practice is to store the file with pickle.

SeF Over a year ago

Beware that with %store, data type like str are saved as (<class 'str'>,), and when %load it raises an error... Definitely, go with pickle!

Pepe Alvarez Over a year ago

beware you have to type it like this: %store foo >a.txt to work. If you type it in this way: %store foo > a.txt you will get a FileNotFound error.

Honghe.Wu · Accepted Answer · 2013-01-16 05:12:35Z

30

Just do as follow:

%save file_name.py _oh[7]

PS: Some additional useful command:

%save file_name.py _

'_' refers to the previous output.

Or you can:

%save file_name.py _oh[i]

'i' refers to the output history number, you can see output first via:

_oh

edited Jan 16, 2013 at 5:12

answered Jan 16, 2013 at 5:07

Honghe.Wu

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Comments

tutuDajuju · Accepted Answer · 2018-03-26 12:31:27Z

8

The %%capture cell magic saves the stdout/stderr output of running a command, if that's what you need. Here's the usage syntax:

%%capture [--no-stderr] [--no-stdout] [--no-display] [output]

And, here's a usage example:

In [1]: %%capture my_print_output
    ...: print('test')
    ...:

In [2]: my_print_output
Out[2]: <IPython.utils.capture.CapturedIO at 0x7f2efa2c12d0>

In [3]: test_output.show()
test

The output object is an instance of IPython.utils.capture.CapturedIO, which has a neat interface for accessing stdout/stderr or combined output.

answered Mar 26, 2018 at 12:31

tutuDajuju

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1 Comment

user2679290 Over a year ago

Yep. You should use x=my_print_output.stdout %store x > file

Dave Kuhlman · Accepted Answer · 2012-11-07 23:30:49Z

1

IPython captures the value (output) of the last command in the variable _ (underscore).

%edit some_variable

will open the value of a variable in your editor.

So, "%edit _", should enable you to edit and save the value of the last command.

See the History section of the IPython docs

And to learn about the possible arguments to the %edit magic function, type the following at the ipython prompt:

%edit?

answered Nov 7, 2012 at 23:30

Dave Kuhlman

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1 Comment

Amelio Vazquez-Reina Over a year ago

Hmm, when I try this on a numpy array I get 'NoneType' object is not iterable

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