Define a recursive function named immutify; it is passed any data structure that contains int, str, tuple, list, set, frozenset, and dict values (including nested versions of any of these data structures as an argument). It returns an immutable equivalent data structure (one that could be used for values in a set or keys in a dict). The types int, str, and frozenset are already immutable. Convert a set to a frozenset; convert all the values in a tuple to be their immutable equivalents, in the same order); convert a list to a tuple (with immutable equivalents of its values, in the same order); convert a dict to tuple of 2-tuples (see the association tuple in question 2) but here with the 2-tuples sorted by the dict’s keys. If immutify ever encounters a value of another type (e. g., float) it should raise a TypeError exception.

The following call (with many mutable data structures)
Example 1:
immutify( {'b' : [1,2], 'a' : {'ab': {1,2}, 'aa' : (1,2)}} )
returns the immutable data structure
(('a', (('aa', (1, 2)), ('ab', frozenset({1, 2}, ('b', (1, 2)))
Example 2:
immutify( [{1,2}, {3,frozenset([4,5])}, {6,7}])
Returns
(frozenset({1, 2}), frozenset({3, frozenset({4, 5})}), frozenset({6, 7}))

1. the program must provide following functions to extract some statistics. note that the data_list parameter specified in these functions may be the same for all functions or different for different functions—that is your choice. a skeleton file is provided on mirmir. a) open_file()prompts the user to enter a year number for the data file. the program will check whether the year is between 1990 and 2015 (both inclusive). if year number is valid, the program will try to open data file with file name ‘year. txt’, where is the year. appropriate error message should be shown if the data file cannot be opened or if the year number is invalid. this function will loop until it receives proper input and successfully opens the file. it returns a file pointer and year. i. hint: use string concatenation to construct the file name b) read_file(fp)has one parameter, a file pointer read. this function returns a list of your choosing containing data you need for other parts of this project. c) find_average(data_list) takes a list of data (of some organization of your choosing) and returns the average salary. the function does not print anything. hints: i. this is not the average of the last column of data. it is not mathematically valid to find an average by finding the average of averages—for example, in this case there are many more in the lowest category than in the highest category. ii. how many wage earners are considered in finding the average (denominator)

The forerunner to cell phones, pdas, and smartphones was

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