"+=" does not work correct all alogn

Wilfried Falk w_h_falk at yahoo.de
Wed Jan 18 04:52:55 EST 2012

Hello Pythons,
attached to this email is a pdf-file which shows, that  "+=" does not work well all along. Mybe somebody of you is able to explain my observations in this respect. I will be glad about an answer.
Best regards
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