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Download e-book for iPad: An Introduction to Python and LaTeX (draft) by Pramode C.E

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5. 00 In just two more steps, we reach close enough to the required value! 3 Writing a square root finding program In describing the root finding algorithm, we used terms like “improve”, “average”, “good enough” etc. The Python programming language has no idea what these terms stand for. But we can “teach” Python the meaning of these words by defining functions whose names are improve, average and good_enough. Let’s give it a try. 2. 01 >>> def average(a, b): ... 0 ... 2 Defining improve An improved guess is average of Guess and X/Guess.

An empty line should be typed as the last line of the class declaration (similar to functions, while loops etc). 3. 01 >>> def better_student(p, q): ... mark): ... name ... else: ... name ... >>> better_student(a, b) ’Jerry’ >>> Note: The above code should be written after defining class student and creating two students a and b. Which version of better_student is more readable? Obviously, the second one! name = ’Rohit’ >>> better_student(m, n) Traceback (most recent call last): File "", line 1, in File "", line 2, in better_student AttributeError: student instance has no attribute ’mark’ >>> We haven’t created an attribute mark for our student Rohit!

2 Exceptions It is more difficult to troubleshoot errors which occur during program execution. Let’s look at a simple example. 01 Here is a Python function for computing the slope: >>> def slope(x1, y1, x2, y2): ... m = (y2 - y1) / (x2 - x1) ... print ’slope computed’ ... return m ... 0) Traceback (most recent call last): File "", line 1, in File "", line 2, in slope ZeroDivisionError: float division >>> We are getting an error; the last line of the message conveys the exact nature of this error - it is a zero division error.

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An Introduction to Python and LaTeX (draft) by Pramode C.E


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