Style guide (PEP-8) says:
The preferred way of wrapping long lines is by using Python’s implied line continuation inside parentheses, brackets and braces. Long lines can be broken over multiple lines by wrapping expressions in parentheses. These should be used in preference to using a backslash for line continuation. Make sure to indent the continued line appropriately. The preferred place to break around a binary operator is after the operator, not before it.
Method 1: Using parenthesis
if (number > 5 and
number < 15):
print "1"
Method 2: Using backslash
if number > 5 and \
number < 15:
print "1"
Method 3: Using backslash + indent for better readability
if number > 5 and \
number < 15:
print "1"