from typing import List, Dict, Tuple, TextIO

"""
CSC120 Fall 2018 - Exercise 5
This file contains the functions for E5.
Note: Do NOT leave any print statements in
this file when you submit it.
"""

def pet_dictionary(pets: List[List[str]]) -> Dict[str, List[Tuple[str]]]:
    """Return a dictionary where the keys are the species in pets
    and the values are list of tuples that contain the names and
    ages (as strings) of each pet of that species.
    
    >>> pets = [['Shoji', 'cat', '18'], ['Hanako', 'dog', '15'], \
                ['Sachiko', 'alligator', '7'], ['Toby', 'dog', '12']]
    >>> pet_dictionary(pets)
    {'cat': [('Shoji', '18')], 'dog': [('Hanako', '15'), ('Toby', '12')], \
     'alligator': [('Sachiko', '7')]}
    """
   # Add your code here
   

def file_line_lengths(f: TextIO) -> Dict[int, int]:
    """Return a dictionary where the keys are the lengths of the lines in the 
    open file f, and the values are the numbers of lines in the file
    that have each length.
    Newline characters '\n' should not be included when counting the length of
    the string.
    
    (Download the file words.txt from the course website as an example.  You 
    should also create your own files to test this function.)
    
    >>> word_file = open('words.txt')
    >>> file_line_lengths(word_file)
    {2: 1, 5: 3, 3: 1}
    >>> word_file.close()
    """
    # Add your code here
   

def next_character(s: str, n: int) -> Dict[str, str]:
    """Return a dictionary where the keys are all substrings of s with
    length n that have a character after them, and the values are lists
    of all single characters after any occurence of that substring.
    
    >>> next_character('abbc', 1)
    {'a': ['b'], 'b': ['b', 'c']}
    >>> next_character('abbc', 2)
    {'ab': ['b'], 'bb': ['c']}
    >>> next_character('abbc', 3)
    {'abb': ['c']}
    """
    # Add your code here