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Consider this sample python code. It reads from stdin and writes to a file.
import sys
arg1 = sys.argv[1]
f = open(arg1,'w')
f.write('<html><head><title></title></head><body>')
for line in sys.stdin:
f.write("<p>")
f.write(line)
f.write("</p>")
f.write("</body></html>")
f.close()
Suppose I want to modify this same program to write to stdout instead. Then, I'll have to replace each instance of f.write() with sys.stdout.write(). But that would be too tedious. I want to know if there is a way to specify f as an alias for sys.stdout, so that f.write() is treated as sys.stdout.write().
648
Names in Python are just bindings. Therefore:
f = sys.stdout
Just binds the name f to the object that's also bound to sys.stdout...
Note that since they're both the same object, any changes you make to f or sys.stdout at this point will affect both... So don't do f.close() as you normally wouldn't want to do sys.stdout.close()...
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