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E make your program test itself write readable code

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Unformatted text preview: program! 35 RECAP: Types, values, expressions • Example: the “+” operator works on: Numbers: Strings   Note: “+” does not work with numbers and strings together 36 12 13 ­09 ­10 RECAP: Types, values, expressions • The type() func3on tells you the type of the value • type() also works with en3re expressions (e.g., x+1) 37 help()  iteraAve help from the shell type your topic 38 Again… remember • Formal languages like Python are literal: you have to specify precisely what you want done   E.g.: if you want to update the value of ‘area’ aXer upda3ng the value of ‘width’, you must explicitly do so • Every expression and every command has a unique (unambiguous) meaning, which may or may not be what you would expect   Learn what each expression means by trying them out and also varying them a bit (to see what happens)   Tinker with Python! 39 13 13 ­09 ­10 Debugging • We all make mistakes… Syntac3c Errors •  Happen when you give Python inst...
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