code copy from pep-3134

[bluefrog]

I'm attempting to run the snippet of code in PEP-3134, but I'm not getting the errors stated.
The code relates to implicit exception handling. The expectation, according to the PEP, is:

The ultimate result will be an AttributeError due to the misspelling of clos, whose __context__ points to a NameError due to the misspelling of ex, whose __context__ points to an IOError due to the file being read-only, whose __context__ points to a ZeroDivisionError, whose __context__ attribute is None.

#!/usr/bin/python3

def main(filename):
  file = open(filename)       # oops, forgot the 'w'
    try:
      try:
        compute()
      except Exception, exc:
        log(file, exc)
    finally:
      file.clos()         # oops, misspelled 'close'

def compute():
  1/0

def log(file, exc):
  try:
    print >>file, exc       # oops, file is not writable
  except:
    display(exc)

def display(exc):
  print ex                    # oops, misspelled 'exc'

if __name__ == "__main()__":
  main('t.txt')

I get the following syntax error instead of what is expected:

Error:
  File "./exception_chaining.py", line 5
    try:
    ^
IndentationError: unexpected indent

Can anybody suggest why ?