The following is all stolen from E: see http://www.erights.org/.
As i mentioned in the previous message, there are reasons that
we might want to enable files to know what it means to print
things on them.
print x
would mean
sys.stdout.printout(x)
where sys.stdout is defined something like
def __init__(self):
self.encs = ["ASCII"]
def pushenc(self, enc):
self.encs.append(enc)
def popenc(self):
self.encs.pop()
if not self.encs: self.encs = ["ASCII"]
def printout(self, x):
if type(x) is type(u""):
self.write(x.encode(self.encs[-1]))
else:
x.__print__(self)
self.write("\n")
and each object would have a __print__ method; for lists, e.g.:
def __print__(self, file):
file.write("[")
if len(self):
file.printout(self[0])
for item in self[1:]:
file.write(", ")
file.printout(item)
file.write("]")
for floats, e.g.:
def __print__(self, file):
if hasattr(file, "floatprec"):
prec = file.floatprec
else:
prec = 17
file.write("%%.%df" % prec % self)
The passing of control between the file and the objects to
be printed enables us to make Tim happy:
>>> l = [1/2, 1/3, 1/4] # I can dream, can't i?
>>> print l
[0.3, 0.33333333333333331, 0.25]
>>> sys.stdout.floatprec = 6
>>> print l
[0.5, 0.333333, 0.25]
Fantasizing about other useful kinds of state beyond "encs"
and "floatprec" ("listmax"? "ratprec"?) and managing this
namespace is left as an exercise to the reader.
-- ?!ng
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