how to do a newline when wirting to a file in python code example

Example 1: python writelines newline

lines = ['line1', 'line2']
with open('filename.txt', 'w') as f:
    f.writelines("%s\n" % l for l in lines)

Example 2: write code in new line python

s = 'https://ja.wikipedia.org/wiki/'\
    '%E3%83%97%E3%83%AD%E3%82%B0%E3%83'\
    '%A9%E3%83%9F%E3%83%B3%E3%82%B0%E8%A8%80%E8%AA%9E'

print(s)
# https://ja.wikipedia.org/wiki/%E3%83%97%E3%83%AD%E3%82%B0%E3%83%A9%E3%83%9F%E3%83%B3%E3%82%B0%E8%A8%80%E8%AA%9E