PYTHON QUESTION

Exercise 9.2.9: Strings To Integers 6 points

Make a function called safe_int that takes a single argument. This function

should try to convert the argument into an integer. If this succeeds, the

function should return that integer. Otherwise, the function should return 0.

Then, use this function in a list comprehension to create a list out of the

given list. The new list should contain either a O or the correct integer in

place of every string in the given list:

[0, 2, 7, 0]

Make sure to print out the resulting list.

Choice of type is influenced primarily by these two factors?

Some of your friends have gotten into the burgeoning field of time-series data mining, in which one looks for patterns in sequences of events that occur over time. purchases at stock exchanges--what’s being bought-- are one source of data with a natural ordering in time. given a long sequence s of such events, your friends want an efficient way to detect certain "patterns" in them--for example, they may want to know if the four events buy yahoo, buy ebay, buy yahoo, buy oracle occur in this sequence s, in order but not necessarily consecutively. they begin with a collection of possible events (e.g., the possible’ transactions) and a sequence s of n of these events. a given event may occur multiple times in s (e.g., yahoo stock may be bought many times in a single sequence s). we will say that a sequence s’ is a subsequence of s if there is a way to delete certain of the events from s so that the remaining events, in order, are equal to the sequence s’. so, for example, the sequence of four events above is a subsequence of the sequence buy amazon, buy yahoo, buy ebay, buy yahoo, buy yahoo, buy oracle their goal is to be able to dream up short sequences and quickly detect whether they are subsequences of s. so this is the problem they pose to you: give an algorithm that takes two sequences of even~s--s’ of length m and s of length n, each possibly containing an event more than once--and decides in time o(m n) whether s’ is a subsequence of s

Which statistical function in a spreadsheet you to see how far each number varies, on average, from the average value of the list?