python

#Assignment for Python
import sys

#frequency statistics from http://en.wikipedia.org/wiki/Letter_Frequency
englishLetterFreq = {'E' :12.70, 'T': 9.06, 'A': 8.17, 'O': 7.51, 'I': 6.97, 'N': 6.75, 'S': 6.33, 'H': 6.09, 'R': 5.99, 'D': 4.25, 'L': 4.03, 'C': 2.78, 'U': 2.76, 'M': 2.41, 'W': 2.36, 'F': 2.23, 'G': 2.02, 'Y': 1.97, 'P': 1.93, 'B': 1.29, 'V': 0.98, 'K': 0.77, 'J': 0.15, 'X': 0.15, 'Q': 0.10, 'Z': 0.07}
ETAOIN = 'ETAOINSHRDLCUMWFGYPBVKJXQZ'
ALPHABET = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'

def getLetterCount(message):
    letterCount = {'A': 0, 'B': 0, 'C': 0, 'D': 0, 'E': 0, 'F': 0, 'G': 0, 'H': 0, 'I': 0, 'J': 0, 'K': 0, 'L': 0, 'M': 0, 'N': 0, 'O': 0, 'P': 0, 'Q': 0, 'R': 0, 'S': 0, 'T': 0, 'U': 0, 'V': 0, 'W': 0, 'X': 0, 'Y': 0, 'Z': 0}

    for letter in message.upper():
        if letter in ALPHABET:
            letterCount[letter] += 1

    return letterCount


try:
    textFile= open(sys.argv[1],"r")
except:
        print("The file {} could not be opened...".format(sys.argv[1]))

fileString = textFile.read().replace(" ", "")

letterCount = letterCount(fileString)
print(letterCount)