# AI News, BOOK REVIEW: Difference between revisions of "How to Think Like a Computer Scientist: Learning with Python 2nd Edition/Solutions"

- On 4. oktober 2018
- By Read More

## Difference between revisions of "How to Think Like a Computer Scientist: Learning with Python 2nd Edition/Solutions"

The following section contains answers to the exercises in the Book.

choice = raw_input ('Please Enter a Function.') #had to ask about this, choice is raw input.

Why does a call to num_digits(-24) result in an infinite loop (hint: -1/10 evaluates to -1)?

The loop will end when n = 0, and per above -1/10 == -1, causing an infinite loop.

Encapsulate: in a function named count_letters, and generalize it so that it accepts the string and the letter as arguments.

Now rewrite the count_letters function so that instead of traversing the string, it repeatedly calls find (the version from Optional parameters), with the optional third parameter to locate new occurences of the letter being counted.

isleap(year) - Return 1 for leap years, 0 for non-leap years.

ceil function finds the lowest integeral value greater than or equal to x.

deepcopy would have come handy in exercises you didn't have to solve regarding object reference, thus no answer is excpected here.

The word 'alice' occurs 386 times (not including 12 occurences of 'alice's')

- On 14. april 2021

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