how to do a line break 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 write line break

new_line = "This new line will be added.\n"

with open("sample.txt", "a") as a_file:
  a_file.write("\n")
  a_file.write(new_line)