Dear all: A bug in Z SQL method wasted my whole precious morning! Write the body of a Z SQL method as below, with only Arguments as 'client' insert into test values(client) now goto 'test', input something or not, everytime you get "Error, exceptions.TypeError: __call__() got multiple values for keyword argument 'client' " since the actual case I am debugging is more complex than this, I didn't reach the point at first. I tried my whole precious morning, trying this and that, examine here and there, feeling like jump our of window or smash my computer :-) (not so bad, in face :-) just because that I never expect that the problem exist at the NAME!!!!! at last, nearly tried every thing I can guess (am I too stupid? maybe), I replaced argument name "client" to "clientname" , then everything is fine. Woo, but WHY???? what's inside this? I didn't read this at anywhere. Is there still more like this ahead? May I be so bold to add some comment: when using Zope at first, I am shocked by how easy it is to use, just a few code can do great thing that you need to write several times of codes otherwise, like Java. But more and more, I found that I used several times debugging effort than Java. Perhaps because that I am just new to Zope. But I think the "Zope Book" is not explicit enough, for example, no where mentioned that when you call a DTML method from a python method, you need to pass its container folder or something as parameter, or your DTML method can never find the standard-header...... I spend several hour to find out.... I don't know whether it is my own problem or Zope's problem. But this time, the "client" and "clientname" killed me. I am considering seriously whether or not shall I turn back to Java in next project. Thanks very much. I am not mean to say bad word to Zope. Ren Bing