In python, what does the 2nd % signifies?
print "%s" % ( i )
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5 Answers
As others have said, this is the Python string formatting/interpolation operator. It's basically the equivalent of sprintf in C, for example:
a = "%d bottles of %s on the wall" % (10, "beer")
is equivalent to something like
a = sprintf("%d bottles of %s on the wall", 10, "beer");
in C. Each of these has the result of a being set to "10 bottles of beer on the wall"
Note however that this syntax is deprecated in Python 3.0; its replacement looks something like
a = "{0} bottles of {1} on the wall".format(10, "beer")
This works because any string literal is automatically turned into a str object by Python.
Comments
The second % is the string interpolation operator.
Comments
print "%d%s" % (100, "trillion dollars") # outputs: 100 trillion dollars
1 Comment
Ben Blank
Actually, it outputs "100trillion dollars" — you're missing a space. :-)
If you were to translate the code to English, it says: take the string i and format it in to the predicate string.
Another example:
name = "world"
print "hello, %s" % (name)
Comments
It's a format specifier
Simple usage:
# Prints: 0 1 2 3 4 5 6 7 8 9
for i in range(10):
print "%d" % i,
