[issue19099] struct.pack fails first time with unicode fmt

[Vajrasky Kok]

Vajrasky Kok added the comment:

Serhiy, you don't want to clear the cache in the test to simulate the bug?

struct._clearcache()

Other than that, should we raise struct.error instead of ValueError? Right now, the current behaviour in python 2.7 is:

>>> struct.pack('\x80', 3)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
struct.error: bad char in struct format

But you are right. Struct() should have been changed instead of struct.pack.

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<http://bugs.python.org/issue19099>
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