Style fixes

main.py

@@ -1,52 +1,55 @@
+"""The Bookbot program"""
+
 def main():
+    """Generates the book report"""
     history = "/home/chrisstirrup/workspace/github.com/ChrisStirrup/bookbot/books/History.txt"
     shelly =  "/home/chrisstirrup/workspace/github.com/ChrisStirrup/bookbot/books/frankenstein.txt"
     book_path = input('Please enter a path to your .txt document: ')
-    if book_path == 'shelly' or book_path == '':
+    if book_path in ('shelly', ''):
         book_path = shelly
     if book_path == 'history':
         book_path = history
-
-
     text = get_book_text(book_path)
     print("Book Report")
     print(f"There are {word_count(text)} words found in this document")
     for thing in sort_letter_frequency(text):
         print(f"The '{thing['letter']}' letter was found '{thing['frequency']}' times")
     print("Thus endeth the report.")
 
-
 def get_book_text(path):
-    with open(path) as f:
+    """Returns all the text from the given path"""
+    with open(path, encoding="utf-8") as f:
         return f.read()
-    
+
 def word_count(document):
+    """Returns the count of words in the given string"""
     return len(document.split())
 
-def Letter_frequency(document):
+def letter_frequency(document):
+    """Returns a set containing the count of each word in the given string"""
     letter_count = {}
     for d in document.lower():
-         if d in letter_count:
+        if d in letter_count:
             letter_count[d] += 1
-         else:
+        else:
             letter_count[d] = 1
-    return letter_count 
+    return letter_count
 
 def sort_on(d):
+    """Sorting function on the key 'frequency'"""
     return d["frequency"]
 
-
 def sort_letter_frequency(document):
-    letter_count = Letter_frequency(document)
+    """Returns a sorted list containing the frequency of each letter in the given string"""
+    letter_count = letter_frequency(document)
     only_alphabets = {}
     sorted_list = []
     for item in letter_count.items():
         if item[0].isalpha():
             only_alphabets[item[0]] = item[1]
-    for letter in only_alphabets:
-        sorted_list.append({'letter': letter, "frequency":only_alphabets[letter]})
+    for letter, frequency in only_alphabets.items():
+        sorted_list.append({'letter': letter, "frequency": frequency})
         sorted_list.sort(reverse=True, key=sort_on)
     return sorted_list
 
-
 main()