protocol oriented programming swift

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Python advanced programming for object-oriented steps

) print (' Exc_tb ', EXC_TB) Returntruewithfoo () asobj: #res =foo (). __enter__ () #obj =res print (' Withfoo Self code block ', obj) raisenameerror (' name not defined ') print (' ************************************ ') print ('------> ') The three parameters in __exit__ () represent the exception type, outliers and traceability information, and the code block in the WITH statement has an exception, and the code after the with cannot be executed, but the code outside the With statement blo

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