Python project

def cipher(input):
    cryptic = dict()
    infile = open(input, "r")
    for line in infile:
        whole = line.split()
        parts = whole[0]
        key = whole[1]
        cryptic[parts] = key
    infile.close()
    return cryptic

def replaceText(input, cryptic):
    infile = open(input, "r")
    decrypted = ""
    for line in infile:
        for parts in line:
            if parts in cryptic:
                decrypted += cryptic[parts]
            else:
                decrypted += parts
    infile.close()

key = cipher("key.txt")
decode = replaceText("encypted.text",key)
outfile = open("decrypted.txt", "w")
outfile.write(decode + "\n &nbsp")
outfile.close()