It is a string formatting syntax (which it borrows from C).
Please see “PyFormat”:
Python supports formatting values into strings. Although this can include very complicated expressions, the most basic usage is to insert values into a string with the
Edit: Here is a really simple example:
#Python2 name = raw_input("who are you? ") print "hello %s" % (name,) #Python3+ name = input("who are you? ") print("hello %s" % (name,))
%s token allows me to insert (and potentially format) a string. Notice that the
%s token is replaced by whatever I pass to the string after the
% symbol. Notice also that I am using a tuple here as well (when you only have one string using a tuple is optional) to illustrate that multiple strings can be inserted and formatted in one statement.