binaryToDecimal.py
anyBaseToDecimal.py
primeSquares.py
toPigLatin.py
indexer.py

1. Numbers:
   a. Write a program binaryToDecimal.py that will accept as input a string representing a nonnegative integer in binary and output the number in decimal. It is fine to use the built-in function for converting a string to and integer here.
   Example:

   Input a binary number: 100111
   In decimal, that comes to 39
   

   b. Write a program anyBaseToDecimal.py that will first prompt for and accept a string representing an integer (in decimal) greater than or equal to 1 and less than or equal to 36 then prompt for and accept a string representing a nonnegative integer in the base given. It will then print out the value in decimal. It should print an error message if the strings given are not compatible and in that case it should then should repeat the prompts. Your code should perform the conversion operation without resorting to any library routine for the conversion.
   Example:

   Input the radix that you intend to use: 5
   Now input a number in base 5:  406
   That is not a valid number in base 5.
   Now input a number in base 5:  403
   In decimal, that comes to 103
   

2. Lists and numbers:
   a. Write a program primeSquares.py that inputs a number from the user and prints out a list of the squares of all prime numbers less than or equal to the number. If the input is not a number, your program can throw an exception. If the number is less than 2, then the output should be the empty list []. Here's an example:

   Please input an integer: 23
   [4, 9, 25, 49, 121, 169, 289, 361, 529]
   

   Use the following constructs in your implementation:
   -- a user-defined function called isPrime that itself includes a while loop or a for loop.
   -- a list comprehension.

 

3. Strings:
   Write a program toPigLatin.py that runs its own read-eval-print loop in which evaluation means translating into Pig Latin. You should implement the translation using string methods. (Do not use regular expressions in this assignment.) Here is an Example:

   Enter your English phrase or "bye": I love languages.
   Pig Latin: Iway ovelay anguageslay.
   Enter your English phrase or "bye": except Pig Latin.
   Pig Latin: exceptway Igpay Atinlay.
   Enter your English phrase or "bye": bye.
   eyebay, eyebay!
   

   The example illustrates the way to handle words with capital letters. Words with leading capitals should still have leading capitals after translation. Any other capital letters should be carried through translation. If an input word is entirely capitalized, then its translation should also be entirely capitalized, except if it is the word "I".

   The rules for translating to Pig Latin are as follows. If the word begins with a vowel, simply append "way" to it. If the word starts with a consonant, pair of consonants or three consonants (for now let's call the longest consonant prefix of the word *), remove * from the beginning, putting it at the end, and then append "ay". For example "straight" becomes "aightstray". A word like "bye" is a special case, because here "ye" functions as a vowel, and yet the translation to "yebay" would not sound right when read by an untrained reader. You do not have to handle special cases such as this.
    
   

4. Dictionaries, Strings, and Lists of Numbers:
   Write a program indexer.py that reads in a text file (containing English text such as Lincoln's Gettysburg address) and outputs a sorted index of the words that occur in the text and what lines they occur in. For example, if the input file is as follows, then the index starts as shown after that. All words are converted to lower case as they are indexed. Non-letter characters such as whitespace, newlines, punctuation and digits are treated as separators. Multiple occurrences of the same word have their index entries combined to form a sorted, comma-separated sequence of line numbers. If two or more occurrences of the same word occur on the same line, that line number should occur only once in the word's entry.

     Four score and
   seven years ago,
   our fathers
   brought forth on this continent, a new nation
   conceived in liberty, and dedicated to the
   proposition that all men are created equal.
   
   a: 4
   ago: 2
   all: 6
   and: 1, 5
   are: 6
   brought: 4
   conceived: 5
   continent: 4
   created: 6
   dedicated: 5
   equal: 6
   fathers: 3
   forth: 4
   four: 1
   ...
   

   Your program should start by prompting the user for the name of the file to be read in. If it cannot open the file, it should report that politely and then quit. You should use the following constructs in implementing this program:
   --a dictionary whose keys are words.
   --the try-except construct.
   --lists of line numbers.
   --the sort method for lists.