tables with small letters?

Hello,

I write a test python file to connect my postgresql database. My table 
called Testtabelle. Python always bring an error... "a relation called 
testtabelle not exists" or so.. So I try to change the tablename from 
Testtabelle to testtabelle... uups and it works..?? Is this possible 
that pypgsql only allows tablenames with small letters????

thank you

Muhlis

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