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""" |
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Data Input Output class |
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""" |
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# package to add support for multi-language (i18n) |
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import gettext |
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# package to handle files/folders and related metadata/operations |
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import os |
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# package facilitating Data Frames manipulation |
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import pandas |
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class DataInputOutput: |
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locale = None |
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def __init__(self, default_language='en_US'): |
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current_script = os.path.basename(__file__).replace('.py', '') |
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lang_folder = os.path.join(os.path.dirname(__file__), current_script + '_Locale') |
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self.locale = gettext.translation(current_script, lang_folder, languages=[default_language]) |
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@staticmethod |
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def fn_add_missing_defaults_to_dict_message(in_dict): |
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if 'field delimiter' not in in_dict: |
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in_dict['field delimiter'] = os.pathsep |
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if 'compression' not in in_dict: |
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in_dict['compression'] = 'infer' |
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return in_dict |
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def fn_build_feedback_for_logger(self, operation_details): |
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messages = {} |
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if operation_details['operation'] == 'load': |
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files_counted = str(operation_details['files counted']) |
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messages = { |
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'failed': self.locale.gettext('Error encountered on loading Pandas Data Frame ' |
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+ 'from {file_type} file type (see below)'), |
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'success': self.locale.gettext( |
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'All {files_counted} files of type {file_type} ' |
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+ 'successfully added to a Pandas Data Frame').replace('{files_counted}', |
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files_counted) |
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} |
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elif operation_details['operation'] == 'save': |
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messages = { |
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'failed': self.locale.gettext('Error encountered on saving Pandas Data Frame ' |
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+ 'into a {file_type} file type (see below)'), |
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'success': self.locale.gettext( |
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'Pandas Data Frame has just been saved to file "{file_name}", ' |
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+ 'considering {file_type} as file type').replace('{file_name}', |
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operation_details['name']), |
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} |
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messages['failed'].replace('{file_type}', operation_details['format'].upper()) |
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messages['success'].replace('{file_type}', operation_details['format'].upper()) |
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return messages |
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def fn_file_operation_logger(self, local_logger, in_logger_dict): |
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messages = self.fn_build_feedback_for_logger(in_logger_dict) |
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if in_logger_dict['error details'] is None: |
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local_logger.info(messages['success']) |
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else: |
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local_logger.error(messages['failed']) |
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local_logger.error(in_logger_dict['error details']) |
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def fn_load_file_into_data_frame(self, in_logger, timer, in_dict): |
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timer.start() |
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in_dict = self.fn_add_missing_defaults_to_dict_message(in_dict) |
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in_dict.update({'operation': 'load'}) |
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details_for_logger = self.fn_pack_dict_message(in_dict, in_dict['file list']) |
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out_df = None |
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try: |
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if in_dict['format'].lower() == 'csv': |
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out_df = pandas.concat([pandas.read_csv(filepath_or_buffer=crt_file, |
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delimiter=in_dict['field delimiter'], |
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cache_dates=True, |
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index_col=None, |
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memory_map=True, |
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low_memory=False, |
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encoding='utf-8', |
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) for crt_file in in_dict['file list']]) |
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elif in_dict['format'].lower() == 'excel': |
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out_df = pandas.concat([pandas.read_excel(io=crt_file, |
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verbose=True, |
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) for crt_file in in_dict['file list']]) |
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elif in_dict['format'].lower() == 'pickle': |
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out_df = pandas.concat([pandas.read_pickle(filepath_or_buffer=crt_file, |
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compression=in_dict['compression'], |
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) for crt_file in in_dict['file list']]) |
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except Exception as err: |
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details_for_logger['error details'] = err |
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self.fn_file_operation_logger(in_logger, details_for_logger) |
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timer.stop() |
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return out_df |
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@staticmethod |
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def fn_pack_dict_message(in_dict, in_file_list): |
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return { |
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'compression': in_dict['compression'], |
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'field delimiter': in_dict['field delimiter'], |
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'files counted': len(in_file_list), |
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'error details': None, |
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'name': in_dict['name'], |
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'format': in_dict['format'], |
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'operation': in_dict['operation'], |
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} |
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def fn_store_data_frame_to_file(self, in_logger, timer, in_data_frame, in_file_details): |
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timer.start() |
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if self.fn_store_data_frame_to_file_validation(in_logger, in_file_details): |
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in_dict = self.fn_add_missing_defaults_to_dict_message(in_file_details) |
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in_dict.update({'operation': 'save'}) |
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in_dict = self.fn_pack_dict_message(in_dict, [in_file_details['name']]) |
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self.fn_store_data_frame_to_known_file_format(in_logger, in_data_frame, in_dict) |
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timer.stop() |
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def fn_store_data_frame_to_known_file_format(self, in_logger, in_data_frame, in_dict): |
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try: |
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if in_dict['format'].lower() == 'csv': |
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in_data_frame.to_csv(path_or_buf=in_dict['name'], |
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sep=in_dict['field delimiter'], |
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header=True, |
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index=False, |
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encoding='utf-8') |
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elif in_dict['format'].lower() == 'excel': |
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in_data_frame.to_excel(excel_writer=in_dict['name'], |
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engine='xlsxwriter', |
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freeze_panes=(1, 1), |
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verbose=True) |
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elif in_dict['format'].lower() == 'pickle': |
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in_data_frame.to_pickle(path=in_dict['name'], |
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compression=in_dict['compression']) |
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except Exception as err: |
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in_dict['error details'] = err |
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self.fn_file_operation_logger(in_logger, in_dict) |
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def fn_store_data_frame_to_file_validation(self, local_logger, in_file_details): |
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given_format_is_implemented = False |
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if 'format' in in_file_details: |
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implemented_file_formats = ['csv', 'excel', 'pickle'] |
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given_format = in_file_details['format'].lower() |
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given_format_is_implemented = True |
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if given_format not in implemented_file_formats: |
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given_format_is_implemented = False |
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local_logger.error(self.locale.gettext( |
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'File "format" attribute has a value of "{format_value}" ' |
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+ 'which is not among currently implemented values: ' |
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+ '"{implemented_file_formats}", ' |
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+ 'therefore desired file operation is not possible') |
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.replace('{format_value}', given_format) |
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.replace('{implemented_file_formats}', |
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'", "'.join(implemented_file_formats))) |
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else: |
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local_logger.error(self.locale.gettext( |
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'File "format" attribute is mandatory in the file setting, but missing, ' |
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+ 'therefore desired file operation is not possible')) |
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return given_format_is_implemented |
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danielgp /
db-extractor
