87 lines
2.2 KiB
Python
87 lines
2.2 KiB
Python
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'''
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Local File Publisher
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Abstract:
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The class contained within this module allows python programs to
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publish weather conditions to a local text file. The format of the file is:
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field value [value ...]
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field value [value ...]
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field value [value ...]
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...
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...
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Each 'field' will begin on a separate line. The 'field' parameter is always a
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single word. Depending on the field, there maybe be multiple 'value'
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parameters. All fields and values are separated by a single space. String
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values will be surrounded by quotes.
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This class does not define field names. The implementation assigns field names
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from the keyword parameters passed to it through the set() method. Therefore it
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is up to the user to define all field names using named parameters with the
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'set()' method. If you desire to keep the TextFile.set() command compatible
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with other set() publisher methods, please reference the other classes for
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expected field names.
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Usage:
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>>> publisher = TextFile( 'file_name' )
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>>> publisher.set( ... )
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>>> publisher.publish()
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Author: Patrick C. McGinty (pyweather@tuxcoder.com)
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Date: Thursday, July 15 2010
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'''
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import io
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import logging
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log = logging.getLogger(__name__)
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from . _base import *
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class TextFile(object):
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'''
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Publishes weather data to a local file. See module
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documentation for additional information and usage idioms.
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'''
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def __init__(self, file_name):
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self.file_name = file_name
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self.args = {}
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def set( self, **kw):
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'''
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Store keyword args to be written to output file.
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'''
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self.args = kw
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log.debug( self.args )
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@staticmethod
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def _append_vals( buf, val):
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if isinstance(val,dict):
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msg = 'unsupported %s type: %s' % (type(val),repr(val),)
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log.error(msg)
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if isinstance(val,(list,tuple)):
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for i in val:
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TextFile._append_vals(buf, i)
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else:
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buf.write(' ' + repr(val))
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def publish(self):
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'''
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Write output file.
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'''
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with open( self.file_name, 'w') as fh:
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for k,v in self.args.items():
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buf = io.StringIO()
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buf.write(k)
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self._append_vals(buf,v)
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fh.write(buf.getvalue() + '\n')
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buf.close() # free string buffer
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