/usr/lib/python2.7/dist-packages/pbh5tools/cbook.py is in python-pbh5tools 0.8.0+dfsg-5.
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# Copyright (c) 2011-2013, Pacific Biosciences of California, Inc.
#
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# * Neither the name of Pacific Biosciences nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED BY
# THIS LICENSE. THIS SOFTWARE IS PROVIDED BY PACIFIC BIOSCIENCES AND ITS
# CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
# PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL PACIFIC BIOSCIENCES OR
# ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
# BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
# IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#################################################################################
import numpy.ma as ma
"""
A collection of utility functions and classes. Many (but not all)
from the Python Cookbook -- hence the name cbook
"""
def is_string_like(obj):
'Return True if *obj* looks like a string'
if isinstance(obj, (str, unicode)):
return True
# numpy strings are subclass of str, ma strings are not
if ma.isMaskedArray(obj):
if obj.ndim == 0 and obj.dtype.kind in 'SU':
return True
else:
return False
try:
obj + ''
except:
return False
return True
def to_filehandle(fname, flag='rU', return_opened=False):
"""
*fname* can be a filename or a file handle. Support for gzipped
files is automatic, if the filename ends in .gz. *flag* is a
read/write flag for :func:`file`
"""
if is_string_like(fname):
if fname.endswith('.gz'):
import gzip
# get rid of 'U' in flag for gzipped files.
flag = flag.replace('U','')
fh = gzip.open(fname, flag)
elif fname.endswith('.bz2'):
# get rid of 'U' in flag for bz2 files
flag = flag.replace('U','')
import bz2
fh = bz2.BZ2File(fname, flag)
else:
fh = file(fname, flag)
opened = True
elif hasattr(fname, 'seek'):
fh = fname
opened = False
else:
raise ValueError('fname must be a string or file handle')
if return_opened:
return fh, opened
return fh
def is_numlike(obj):
'return true if *obj* looks like a number'
try: obj+1
except: return False
else: return True
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