[Tutor] switch statements (original) (raw)
Alan Gauld alan.gauld at blueyonder.co.uk
Fri Jul 9 21:52:28 CEST 2004
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We were implementing a switch satetement like
testfile.py dec = 1 _perf = { _ _1:bigfile.func1(), _ 2:bigfile.fun2()}[dec]
What this does is create a dictionary with keys 1 and 2 and values the results of the two function calls. You need to lose the parentheses to store references to the functions themselves.
Now when we run the testfile.py we get:
In func1 In func2 which implies that the switch does not actually switch, as it goes through both the functions and retains the one that we asked for. Am I missing something here, why should it step into every function.
What you are seeing is the functions being called as the dictionary is defined. The actuall call to the dictionary(your switch) returns a number value which is not seen because you don't print it.
HTH<
Alan G Author of the Learn to Program web tutor http://www.freenetpages.co.uk/hp/alan.gauld
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