PYTHON:

Your program will take a file name from user and find out occurrences of words in the file. Case shouldn't matter, i.e. "the" and "The" should be counted as same word. Your output should list each word and occurrences of it in the file. Also, at the end, your program needs to print out number of different words in the file. You need to use Python Dictionary for this assignment. Make sure to exclude special characters. But words like "don't", "we'll" should be counted the way they are. Upper case and lower case letters should be treated the same, (i.e. "But" and "but" should be counted as same word)

Then output list of words and their occurrences in alphabetical order. One word per line with occurrences.

If user enters wrong information (wrong name of the file or non-existing file name), your program needs to display message and ask for correct input. Your program should not generate traceback message with any input. Provide comments for all program

Do not read the entire file into the memory. Only use file handle to access it.

Sample files:

ch9sample.txt

ch9sample3.txt

OUTPUT:

Please enter file name: abc.txt File name abc.txt cannot be found Please enter file name: abab File name abab cannot be found Please enter file name: ch9sample.txt Words and frequency in the file ch9sample.txt sorted alphabetically

a 20 all 1 almost 1 an 2 and 3 any 1 are 3 as 3 association 1 avoid 1 be 2 because 2 between 1 build 1 builtin 1 but 2 called 2 can 2 computer 1 corresponding 1 creates 1 dict 2 dictionary 7 different 1 each 1 elements 1 english 1 example 2 fact 1 from 1 function 2 general 2 get 1 have 1 if 1 in 5 index 1 indexed 1 indices 3 instead 1 integer 1 integers 1 is 5 it 1 item 1 items 2 key 2 keys 3 keyvalue 2 like 1 list 2 look 1 mapping 1 maps 2 might 1 more 1 name 2 never 1 new 1 no 1 not 2 of 8 on 1 or 1 order 2 pair 1 pairs 1 positions 1 problem 1 result 1 same 2 set 2 should 1 so 1 sometimes 1 spanish 1 strings 1 that 1 that's 1 the 15 think 1 to 4 type 2 unpredictable 1 up 1 use 1 using 1 value 2 values 3 variable 1 we'll 1 which 1 with 2 words 1 you 5 your 1

There are 96 different words in the file.

Do you want to try another file? (y or n)Y Please enter file name: ch9sample3.txt Words and frequency in the file ch9sample3.txt sorted alphabetically a 16 all 1 almost 2 an 2 and 3 any 1 are 2 as 3 association 1 avoid 1 be 2 because 1 between 1 build 1 builtin 1 but 1 called 2 can 2 creates 1 dict 2 dictionary 5 don't 1 each 1 english 1 example 1 from 1 function 2 general 1 have 1 in 2 index 1 indices 2 integers 2 is 3 it 1 item 1 items 2 key 2 keys 2 keyvalue 1 like 1 list 2 mapping 1 maps 2 more 1 name 3 new 1 no 1 of 5 or 1 pair 1 positions 1 set 2 should 1 so 1 sometimes 1 spanish 1 strings 1 that 1 the 7 think 1 to 3 type 2 using 1 value 2 values 2 variable 1 we'll 1 which 1 with 1 words 1 you 2

There are 72 different words in the file.

Do you want to try another file? (y or n)N Thank you for playing.