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io.py
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145 lines (108 loc) · 3.42 KB
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# -*- coding: utf-8 -*-
# pylint: disable=R1732
#
# Copyright (c) 2015-2025 BigML, Inc
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""Python I/O functions.
:author: jao <jao@bigml.com>
:date: Wed Apr 08, 2015-2025 17:52
"""
import csv
class UnicodeReader():
"""Adapter to read files
"""
def __init__(self, filename, dialect=csv.excel,
encoding="utf-8", **kwargs):
"""Constructor method for the reader
"""
self.filename = filename
self.dialect = dialect
self.encoding = encoding
self.kwargs = kwargs
self.file_handler = None
self.reader = None
def open_reader(self):
"""Opening the file
"""
if self.filename.__class__.__name__ == 'UTF8Recoder':
self.file_handler = self.filename
else:
self.file_handler = open(self.filename, 'rt',
encoding=self.encoding, newline='')
self.reader = csv.reader(self.file_handler, dialect=self.dialect,
**self.kwargs)
return self
def __enter__(self):
"""Opening files
"""
return self.open_reader()
def __exit__(self, ftype, value, traceback):
"""Closing on exit
"""
self.close_reader()
def __next__(self):
"""Reading records
"""
return next(self.reader)
def __iter__(self):
"""Iterator
"""
return self
def close_reader(self):
"""Closing the file
"""
if not self.filename.__class__.__name__ == 'UTF8Recoder':
self.file_handler.close()
class UnicodeWriter():
"""Adapter to write files
"""
def __init__(self, filename, dialect=csv.excel,
encoding="utf-8", **kwargs):
"""Constructor method for the writer
"""
self.filename = filename
self.dialect = dialect
self.encoding = encoding
self.kwargs = kwargs
self.file_handler = None
self.writer = None
def open_writer(self):
"""Opening the file
"""
self.file_handler = open(self.filename, 'wt',
encoding=self.encoding, newline='')
self.writer = csv.writer(self.file_handler, dialect=self.dialect,
**self.kwargs)
return self
def close_writer(self):
"""Closing the file
"""
self.file_handler.close()
def __enter__(self):
"""Opening the file
"""
return self.open_writer()
def __exit__(self, ftype, value, traceback):
"""Closing on exit
"""
self.close_writer()
def writerow(self, row):
"""Writer emulating CSV writerow
"""
self.writer.writerow(row)
def writerows(self, rows):
"""Writer emulating CSV writerows
"""
for row in rows:
self.writerow(row)