Python Help - Learn Python The Hard Way exercise 41 "phrase = PHRASES[snippet]" - python-2.7

Question

I am learning python - this is my first programming language that I am learning. I am a little confused about one line of the code. The full code can also be found at http://learnpythonthehardway.org/book/ex41.html
import random
from urllib import urlopen
import sys
WORD_URL = "http://learncodethehardway.org/words.txt"
WORDS = []
PHRASES = {
"class %%%(%%%):":
"Make a class named %%% that is-a %%%.",
"class %%%(object):\n\tdef __init__(self, ***)" :
"class %%% has-a __init__ that takes self and *** parameters.",
"class %%%(object):\n\tdef ***(self, ###)":
"class %%% has-a function named *** that takes self and ### parameters.",
"*** = %%%()":
"Set *** to an instance of class %%%.",
"***.***(###)":
"From *** get the *** function, and call it with parameters self, ###.",
"***.*** = '***'":
"From *** get the *** attribute and set it to '***'."
}
# do they want to drill phrases first
PHRASE_FIRST = False
if len(sys.argv) == 2 and sys.argv[1] == "english":
PHRASE_FIRST = True
# load up the words from the website
for word in urlopen(WORD_URL).readlines():
WORDS.append(word.strip())
def convert(snippet, phrase):
class_names = [w.capitalize() for w in
random.sample(WORDS, snippet.count("%%%"))]
other_names = random.sample(WORDS, snippet.count("***"))
results = []
param_names = []
for i in range (0, snippet.count("###")):
param_count = random.randint(1,3)
param_names.append(', '.join(random.sample(WORDS, param_count)))
for sentence in snippet, phrase:
result = sentence[:]
# fake class name
for word in class_names:
result = result.replace("***", word, 1)
# fake other names
for word in other_names:
result = result.replace("***", word, 1)
# fake parameter lists
for word in param_names:
result = result.replace("###", word, 1)
results.append(result)
return results
# keep going until they hit CTRL-D
try:
while True:
snippets = PHRASES.keys()
# returns a randomly shuffled dictionary keys list
random.shuffle(snippets)
for snippet in snippets:
phrase = PHRASES[snippet]
question, answer = convert(snippet, phrase)
if PHRASE_FIRST:
question, answer = answer, question
print question
raw_input("> ")
print "ANSWER: %s\n\n" % answer
except EOFError:
print "\nBye"
It is the 11th line of code from the bottom that I don't quite understand: phrase = PHRASES[snippet]. Since snippet in for snippet in snippets: is looping through the keys of the randomized-shuffled PHRASES list, why can't the code simply be phrase = snippet. Thanks in advance for any help.
Cheers - Darren

Answer 1

get the value of key"snippet" in the dictionary