Parentheses are not required after the
assert, del, elif, except, for, if,
in, not, raise, return, while, and yield
keywords, and using them unnecessarily impairs readability.
They should therefore be omitted.
x = 1
while (x < 10):
print "x is now %d" % (x)
x += 1
x = 1
while x < 10:
print "x is now %d" % (x)
x += 1
This rule is deprecated, use {rule:python:S1110} instead.