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outstream.py
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outstream.py
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# code based on https://introcs.cs.princeton.edu/python/code/stdlib-python.zip as downloaded in dec 2017
"""
outstream.py
The outstream module defines the OutStream class.
"""
import sys
#-----------------------------------------------------------------------
class OutStream:
"""
An OutStream object wraps around a text file or sys.stdout, and
supports writing to that stream.
"""
#-------------------------------------------------------------------
def __init__(self, f=None):
"""
Construct self to wrap around a stream. If f is provided, then
the stream is a file of that name. Otherwise the stream is
standard output.
"""
if f is None:
self._stream = sys.stdout
else:
if sys.hexversion < 0x03000000:
self._stream = open(f, 'w')
else:
self._stream = open(f, 'w', encoding='utf-8')
#-------------------------------------------------------------------
def writeln(self, x=''):
"""
Write x and an end-of-line mark to the stream wrapped by self.
"""
if sys.hexversion < 0x03000000:
x = unicode(x)
x = x.encode('utf-8')
else:
x = str(x)
self._stream.write(x)
self._stream.write('\n')
self._stream.flush()
#-------------------------------------------------------------------
def write(self, x=''):
"""
Write x to the stream wrapped by self.
"""
if (sys.hexversion < 0x03000000):
x = unicode(x)
x = x.encode('utf-8')
else:
x = str(x)
self._stream.write(x)
self._stream.flush()
#-------------------------------------------------------------------
def writef(self, fmt, *args):
"""
Write each element of args to the stream wrapped by self.
Use the format specified by string fmt.
"""
x = fmt % args
if sys.hexversion < 0x03000000:
x = unicode(x)
x = x.encode('utf-8')
self._stream.write(x)
self._stream.flush()
#-------------------------------------------------------------------
def __del__(self):
"""
Close the stream wrapped by self.
"""
self._stream.close()