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import os

UPPERLETTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

LETTERS_AND_SPACE = UPPERLETTERS + UPPERLETTERS.lower() + " \t\n"

def loadDictionary():

path = os.path.split(os.path.realpath(__file__))

englishWords = {}

with open(path[0] + "/dictionary.txt") as dictionaryFile:

for word in dictionaryFile.read().split("\n"):

englishWords[word] = None

return englishWords

ENGLISH_WORDS = loadDictionary()

def getEnglishCount(message):

message = message.upper()

message = removeNonLetters(message)

possibleWords = message.split()

if possibleWords == []:

return 0.0

matches = 0

for word in possibleWords:

if word in ENGLISH_WORDS:

matches += 1

return float(matches) / len(possibleWords)

def removeNonLetters(message):

lettersOnly = []

for symbol in message:

if symbol in LETTERS_AND_SPACE:

lettersOnly.append(symbol)

return "".join(lettersOnly)

def isEnglish(message, wordPercentage=20, letterPercentage=85):

"""

>>> isEnglish('Hello World')

True

>>> isEnglish('llold HorWd')

False

"""

wordsMatch = getEnglishCount(message) * 100 >= wordPercentage

numLetters = len(removeNonLetters(message))

messageLettersPercentage = (float(numLetters) / len(message)) * 100

lettersMatch = messageLettersPercentage >= letterPercentage

return wordsMatch and lettersMatch

if __name__ == "__main__":

import doctest

doctest.testmod()

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PL/B Language Development and Support

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