simple conversion of text message

datafile = 'mypost.txt'
def readfile(datafile):
    X = []
    def nonblank_lines(f):
        for l in f:
            line = l.rstrip()
            if line:
                yield line
    myfile = open(datafile,'r')
    for line in nonblank_lines(myfile):
        X.append(str(line))
    return X

numlines = len(readfile(datafile))
mylines = readfile(datafile)

for i in range(numlines):
    trythis = mylines[i]
    print ' '.join(str(ord(trythis[j])) for j in range(len(trythis)))

datafile = 'mypostcrypted.txt'

def getInts(ln):

    return [int(word) for word in ln.split()]

f = open('mypostcrypted.txt')

dat = [getInts(ln) for ln in f]

print len(dat)

for i in range(len(dat)):

    thisline = dat[i]

    print ' '.join(chr(thisline[j]) for j in range(len(thisline)))