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Python convenience function for opening compressed URLs and files.

Project description

Python convenience function canopener(filename, mode=’r’) for opening files.

Local files behave identically to open(). `python canopener('local_file.txt') `

URLs can also be passed as the filename and opened for reading. urllib2.urlopen() is used under the covers, so it has equivalent support. `python canopener('http://remote/file.txt') `

S3 URLs can also be read if the [boto]( module is installed and the AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY environment variables are set. The file is downloaded to a temporary local file on open. `python os.environ['AWS_ACCESS_KEY_ID'] = 'key' os.environ['AWS_SECRET_ACCESS_KEY'] = 'secret' canopener('s3://bucket/file.txt') `

Any paths with “.gz” or “.bz2” extensions are transparently decompressed. `python canopener('local_file.txt.gz') canopener('local_file.txt.bz2') canopener('http://remote/file.txt.gz') canopener('s3://bucket/file.txt.gz') `

There’s also transparent compression when writing to local files. `python canopener('local_file.txt.gz', 'w') `

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