how to break lines 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')

Example 3: python continue to a new line

a = "This" + " is" + " a" + \
	" multi-line" + " statement"