Exercise solutions

ex4

def custom_len(input_list):
    """custom_len(input_list) imitates len(input_list)"""
    count = 0
    for item in input_list:
        count += 1
    return count

def custom_remove(input_list, value):
    """custom_remove(input_list, value) imitates input_list.remove(value)"""
    for i in range(custom_len(input_list)):
        item = input_list[i]
        if item == value:
            del input_list[i]
            input_list[i:i+1] = []
            break

def custom_pop(input_list):
    """custom_pop(input_list) imitates input_list.pop()"""
    item = input_list[-1]
    del input_list[-1]
    return item

def custom_reverse(input_list):
    """custom_reverse(input_list) imitates input_list.reverse()"""
    for i in range(custom_len(input_list)/2):
        front = i
        back = len(input_list)-1-i
        
        tmp = input_list[front]
        input_list[front] = input_list[back] 
        input_list[back] = tmp

ex5

ASCII_A = ord('a')
ASCII_Z = ord('z')

def main():
    letter_counts = [0] * 26
    _file = open("whatever.txt")
    raw_text = _file.read()
    _file.close()
    text = raw_text.lower()
#    text = open("whatever.txt").read().lower()

    for letter in text:
        ascii_code = ord(letter)
        if ascii_code >= ASCII_A and ascii_code <= ASCII_Z:
            letter_counts[ascii_code - ASCII_A] += 1



main()

ex6

def main():
    f = open("whatevs")
    text = f.read().replace(".", "").replace(",", "").replace("!", "")
    #sorryimnotsorry

    word_counts = {}
    
    words = text.split()
    
    for word in words:
        word_counts[word] = word_counts.get(word, 0) + 1

   
    unique_words = word_counts.keys()
    unique_words.sort()

    for word in unique_words:
        print word_counts[word]

    tuples = word_counts.items()
    temp_list = []
    for t in tuples:
        new_tuple = (t[1], t[0])
        temp_list.append(new_tuple)

    temp_list.sort()