[issue10187] exec encode unicode to utf-8 str automatically in GBK environment

[Martin v. Löwis]

Martin v. Löwis <martin at v.loewis.de> added the comment:

> oh,you mentioned the PEP 263
> but I already set a header like this,you can see the attached test.py
> #coding=GBK

You have that in test.py, but not in the string you are giving to exec.
This is really a separate source code.

So you could have written

exec '''#coding:GBK
print hi('%s')
''' % a

You didn't, hence the code you pass to exec has no declared source encoding.

> why exec choose to use utf-8 not GBK?

exec always choses UTF-8 when exec'ing Unicode strings. The source
encoding of the file that has the exec statement must be irrelevant:
the string being exec'ed may have been received from a different source
file.

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