def iopen(name, mode='rU', buffering = -1):
'''
iopen(name, mode = 'rU', buffering = -1) -> file (that closes automatically)
A version of open() that automatically closes the file explicitly
when input is exhausted. Use this in place of calls to open()
or file() that are not assigned to a name and so can't be closed
explicitly. This ensures early close of files in Jython but is
completely unnecessary in CPython.
usage:
from iopen import iopen
print iopen('fname').read(),
for l in iopen('fname'): print l,
lines = [l for l in iopen('fname')]
lines = iopen('fname').readlines()
'''
class Iopen(file):
def next(self):
try: return super(Iopen, self).next()
except StopIteration: self.close(); raise
def read(self, size = -1):
data = super(Iopen, self).read(size)
if size < 0 or not len(data): self.close()
return data
def readline(self, size = -1):
data = super(Iopen, self).readline(size)
if size != 0 and not len(data): self.close()
return data
def readlines(self, size = -1):
data = super(Iopen, self).readlines(size)
if size < 0 or not len(data): self.close()
return data
return Iopen(name, mode, buffering)
