Parentheses are not required after the assert, del, elif, except, for,
if, not, raise, return, while, and yield keywords. Similarly,
parentheses are not required after in in a for loop. Using parentheses unnecessarily impairs readability, and therefore,
they should be omitted.
Noncompliant code example
x = 1
while (x < 10):
print "x is now %d" % (x)
x += 1
Compliant solution
x = 1
while x < 10:
print "x is now %d" % (x)
x += 1
