how to continue a line in python code example

Example 1: python change line in code

a = '1' + '2' + '3' + \
    '4' + '5'

Example 2: line break in python code

a = '1' + '2' + '3' + \
    '4' + '5'

#preferred by style guide
a = ('1' + '2' + '3' +
    '4' + '5')