Embed variable using sys.stdout.write in Python

Question

I can embed variables using the print statement in python in this way

i=10
print "Value is %s" % (i)

Output

Value is 10

but doing this

i=10
sys.stdout.write ("Value is %s") % (i)

gives me the following error

TypeError: unsupported operand type(s) for %: 'NoneType' and 'int'

Can I embed variables using sys.stdout.write instead of print?

Not surprising that you get an error, since the syntax is so wrong. — S.Lott
– S.Lott, Commented Jan 12, 2011 at 14:21
@S.Lott The question is pretty much useless now. I cannot delete it since it has answers. — abel
– abel, Commented Jan 12, 2011 at 14:26
Not utterly useless -- there's a possibility that other people may have the same syntax question. — S.Lott
– S.Lott, Commented Jan 12, 2011 at 14:35

Sven Marnach · Accepted Answer · 2011-01-12 14:20:11Z

16

You got the parentheses wrong. Should be

i=10
sys.stdout.write("Value is %s" % i)

The % operator takes a string and a tuple (or a single object) as arguments. You tried to apply the operator to the return value of sys.stdout.write(), which is None. You need to apply it to the string before it is passed to sys.stdout.write().

answered Jan 12, 2011 at 14:20

Sven Marnach

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