python how to pass value by reference code example

Example 1: python pass by reference

# objects are passed by reference, but
# its references are passed by value

myList = ['foo', 'bar']

def modifyList(l):
  l.append('qux') # modifies the reference
  l = ['spam', 'eggs'] # replaces the reference
  l.append('lol') # modifies the new reference

modifiyList(myList)

print(myList) # ['foo', 'bar', 'qux']

Example 2: does python pass by reference

# primitive types are passed by value
# objects are passed by reference
# https://www.geeksforgeeks.org/is-python-call-by-reference-or-call-by-value/