how to save python screen output to a text file code example

Example 1: python save output to file

with open("output.txt", "a") as f:
    print("Hello StackOverflow!", file=f)
    print("I have a question.", file=f)

Example 2: how to save the command result with ! in python

subprocess = subprocess.Popen("echo Hello World", shell=True, stdout=subprocess.PIPE)