Quine

#!/usr/bin/python

# This is the beginning.

def p(s):
    print(s, end='')

beginning = """#!/usr/bin/python

# This is the beginning.

def p(s):
    print(s, end='')

beginning = """

ending = """

p(beginning)
p('$""')
p(beginning)
p('$""')
p('@n@nending = $""')
p(ending)
p('$""')
p(ending.replace(chr(36), '"').replace(chr(64), chr(92)))

# This is the ending.
"""

p(beginning)
p('"""')
p(beginning)
p('"""')
p('\n\nending = """')
p(ending)
p('"""')
p(ending.replace(chr(36), '"').replace(chr(64), chr(92)))

# This is the ending.