The ATCA Forum

Hi All,

Malte Marquarding has written a Python wrapper for miriad (mirpy) which can greatly simplify scripting with miriad. For further information, please refer to:

http://pypi.python.org/pypi/mirpy/

Cheers,

Emil.

Hi All,

BTW, if anyone has their own filter functions (i.e. to parse the output from miriad tasks into something more usable) could you please post them here. Malte would like to collect these and perhaps incorporate them into mirpy.

Cheers,

Emil.

Hi,

and if you have trouble parsing task output and/or have suggestions for output formatting for miriad tasks that would make that easier please post those here too.
We don't want to change the formats too often, because it might break existing scripts, but some tasks do need improved output or updates for the CABB era.

Cheers,

Mark

Hi,

I'm attempting to use atlod in mirpy and I'm running into many issues. My current execution is detailed in the figure.

Now I've tried the filter:
def atload_filter(output):
return output.decode()

miriad.set_filter(‘atload’, atload_filter)

But I get an AssertionError with not details.

Any help would be greatly appreciated.
Cheers,
Brodie

Hi Brodie,

Does mirpy actually support Python 3? I've never tried. Could you try your exact same steps in 2.7 and see if the problem is the same?

Hi,

The github https://github.com/radio-astro/mirpy states py3 compatibility.

When setting up a conda environment with python 2.7 and using pip to install mirpy I get the the error that the module doesn't have the attribute atlod or set_filter.

Cheers,

You are misspelling "atlod" as "atload" in your call to set_filter. I don't know if this is the problem that you were experiencing originally, but given we should assume that mirpy does support Python 3, it's a possibility.

Could you please show the entire script?

ah yes - an embarrassing mistake.

If I run this code below:
from mirpy import miriad

ddir='/Users/brodienorfolk/obs/c1794/*.C1794'


def atload_filter(output):
return output.decode()


miriad.set_filter('atlod', atload_filter)
miriad.atlod(In=ddir,out='uvdata',options='birdie,rfiflag,xycorr,opcorr,noauto')

In py3 I receive:
TypeError: a bytes-like object is required, not 'str'
In py2.7 I receive:
AssertionError:
(The blank assertion error)

Hi Brodie,

What exactly are you trying to get from the "atload_filter" routine? The "decode" method seems to attach to a byte object, not a string, which would explain why you're getting the errors you are.

If all you're trying to do is get a list of the lines output from atlod, I would suggest you instead change your routine to:
To get access to that output data though, you would also need to assign the miriad.atlod call, like so:

Hi Jamie,

I was using the decode line because Malte suggest it.

Currently I'm trying to run the python wrapper in an attempt to write an automated reduction pipeline - hence trying to output in a similar method as I would in the miriad bash.

I've implemented your new atload_filter but I still get the type error.

from mirpy import miriad

ddir='/Users/brodienorfolk/obs/c1794/*.C1794'


# def atload_filter(output):
# return output.decode()

def atload_filter(output):
return output.split('\n')


miriad.set_filter('atlod', atload_filter)
atlodLines = miriad.atlod(In=ddir,out='uvdata',options='birdie,rfiflag,xycorr,opcorr,noauto')