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73 lines
2.0 KiB
Python
73 lines
2.0 KiB
Python
"""
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This file is a wrapper around pandas built-in functionalities to handle character delimited files
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"""
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import pandas as pd
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import numpy as np
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import os
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class File :
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def __init__(self,**params):
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"""
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@param path absolute path of the file to be read
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"""
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self.path = params['path'] if 'path' in params else None
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self.delimiter = params['delimiter'] if 'delimiter' in params else ','
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def isready(self):
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return os.path.exists(self.path)
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def meta(self,**_args):
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return []
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class Reader (File):
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"""
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This class is designed to read data from disk (location on hard drive)
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@pre : isready() == True
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"""
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def __init__(self,**_args):
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super().__init__(**_args)
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def read(self,**args):
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_path = self.path if 'path' not in args else args['path']
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_delimiter = self.delimiter if 'delimiter' not in args else args['delimiter']
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_df = pd.read_csv(_path,delimiter=self.delimiter)
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if 'query' in args :
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_query = args['query']
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_df = _df.query(_query)
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return _df
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def stream(self,**args):
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raise Exception ("streaming needs to be implemented")
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class Writer (File):
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"""
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This function writes output to disk in a designated location. The function will write a text to a text file
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- If a delimiter is provided it will use that to generate a xchar-delimited file
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- If not then the object will be dumped as is
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"""
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# THREAD_LOCK = RLock()
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def __init__(self,**_args):
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super().__init__(**_args)
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self._mode = 'w' if 'mode' not in _args else _args['mode']
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def write(self,info,**_args):
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"""
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This function writes a record to a designated file
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@param label <passed|broken|fixed|stats>
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@param row row to be written
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"""
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try:
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_delim = self.delimiter if 'delimiter' not in _args else _args['delimiter']
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_path = self.path if 'path' not in _args else _args['path']
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_mode = self._mode if 'mode' not in _args else _args['mode']
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info.to_csv(_path,index=False,sep=_delim)
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pass
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except Exception as e:
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#
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# Not sure what should be done here ...
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print (e)
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pass
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finally:
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# DiskWriter.THREAD_LOCK.release()
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pass |