Python Hash File

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#==============MODULES================#
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import hashlib

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#==============VARIABLES==============#
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chunk_size = 8192
menu = ["(1) MD5    ", "(2) MD4    ", "(3)  SHA-1  ", "(4) SHA-224", "(5) SHA-256", "(6) SHA-384", "(7) SHA-512", "(8) RIPEMD ", "(9) Exit   "]

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#==============FUNCTIONS==============#
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#creates hash menu
def hash_menu(menu):
    print "+================+"
    print "|    HASH MENU   |"
    print "+================+"
    for word in menu:
        print "|  %s   |" % word
        print "|----------------|"
    print

#reads in file to hash | creates new file and saves hash to file | prints hash to screen
def hash_file(filename, hash_type, var):
    with open(filename, 'rb') as f:
        for data in iter(lambda: f.read(chunk_size), b''):
            hash_type.update(data)
    output = hash_type.hexdigest()
    print

    saved_file = str(var) + "_hash_" + filename
    print "Saved %s hash to %s" % (var, saved_file)
    print

    file = open(saved_file, "w")
    file.write(filename + ": " + var + ": " + output)
    file.close()
    print "Hash Written Successfully!"
    print
    print "%s: %s" % (var, output)
    print

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#=============MAIN PROGRAM============#
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def main():
    print "This program hashes a file with a hashing function."
    print
    print

    #display hash menu
    hash_menu(menu)

    #user select hash type
    choice = input("Please select a hash type (1-9): "
    #user defines file to hash
    filename = raw_input("Please enter a file to hash: ")

    #MD5
    if choice == 1:
        var = "MD5"
        hash_type = hashlib.md5()
        hash_file(filename, hash_type, var)
        return
    #MD4
    elif choice == 2:
        var = "MD4"
        hash_type = hashlib.new('md4')
        hash_file(filename, hash_type, var)
        return
    #SHA-1
    elif choice == 3:
        var = "SHA-1"
        hash_type = hashlib.sha1()
        hash_file(filename, hash_type, var)
        return
    #SHA-224
    elif choice == 4:
        var = "SHA-224"
        hash_type = hashlib.sha224()
        hash_file(filename, hash_type, var)
        return
    #SHA-256
    elif choice == 5:
        var = "SHA-256"
        hash_type = hashlib.sha256()
        hash_file(filename, hash_type, var)
        return
    #SHA-384
    elif choice == 6:
        var = "SHA-384"
        hash_type = hashlib.sha384()
        hash_file(filename, hash_type, var)
        return
    #SHA-512
    elif choice == 7:
        var = "SHA-512"
        hash_type = hashlib.sha512()
        hash_file(filename, hash_type, var)
        return
    #RIPEMD
    elif choice == 8:
        var = "RIPEMD"
        hash_type = hashlib.new('ripemd160')
        hash_file(filename, hash_type, var)
        return
    #Exit
    elif choice == 9:
        print "Goodbye. Ending Program..."
        return