how to get the output of a function in python code example

Example 1: python get output

>out = subprocess.Popen(['wc', '-l', 'my_text_file.txt'], 
           stdout=subprocess.PIPE, 
           stderr=subprocess.STDOUT)

Example 2: how to return an output to a function in Python

''' if you don't know def can make a function, 
I am making a simple squaring function to explain''' 
# space after parentisis is needed
def square(x) :
  s = x*x
  # do it with the return keyword!
  return s

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