New submission from Serhiy Storchaka:

When run in Python 3 followed script:

print('first')
#coding=iso8859-1
print('second')

it prints the 'first' string twice.

Besides this weird behavior I think PEP-0263 should specify that if a magic 
comment is second line in the file then first line should be a comment too.

----------
components: Interpreter Core
files: double_first_line.py
messages: 197156
nosy: loewis, serhiy.storchaka
priority: normal
severity: normal
status: open
title: First line can be executed twice
type: behavior
versions: Python 3.3, Python 3.4
Added file: http://bugs.python.org/file31644/double_first_line.py

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue18960>
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