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class FileProxyMixin:
"""
A mixin class used to forward file methods to an underlaying file
object. The internal file object has to be called "file"::
class FileProxy(FileProxyMixin):
def __init__(self, file):
self.file = file
"""
encoding = property(lambda self: self.file.encoding)
fileno = property(lambda self: self.file.fileno)
flush = property(lambda self: self.file.flush)
isatty = property(lambda self: self.file.isatty)
newlines = property(lambda self: self.file.newlines)
read = property(lambda self: self.file.read)
readinto = property(lambda self: self.file.readinto)
readline = property(lambda self: self.file.readline)
readlines = property(lambda self: self.file.readlines)
seek = property(lambda self: self.file.seek)
tell = property(lambda self: self.file.tell)
truncate = property(lambda self: self.file.truncate)
write = property(lambda self: self.file.write)
writelines = property(lambda self: self.file.writelines)
@property
def closed(self):
return not self.file or self.file.closed
def readable(self):
if self.closed:
return False
if hasattr(self.file, 'readable'):
return self.file.readable()
return True
def writable(self):
if self.closed:
return False
if hasattr(self.file, 'writable'):
return self.file.writable()
return 'w' in getattr(self.file, 'mode', '')
def seekable(self):
if self.closed:
return False
if hasattr(self.file, 'seekable'):
return self.file.seekable()
return True
def __iter__(self):
return iter(self.file)