Encoding and decoding morse code strings

morse_code_utils.py

morsecode_map = dict(a=".-",b="-...",c="-.-.",d="-..",e=".",f="..-.",g="--.",h="....",i="..",
                     j=".---",k="-.-",l=".-..",m="--",n="-.",o="---",p=".--.",q="--.-",r=".-.",
                     s="...",t="-",u="..-",v="...-",w=".--",x="-..-",y="-.--",z="--..")

def reverse_python_dict(dict_: dict) -> dict:
    return {dict_[k]:k for k in dict_}

def encode_morsecode(str_: str) -> str:
    result = ""
    for letter in str_:
        if letter == " ":
            result += " "
        else:
            result += " " + morsecode_map[letter]
    return result[1:]


def decode_morsecode(str_: str) -> str:
    """ Expects one space between letters, and 2 spaces between words."""
    decode_map = reverse_python_dict(morsecode_map)
    
    result = ""
    for word in str_.split("  "):
        result += " "        
        for letter in word.split(" "):
            result += decode_map[letter]
    return result[1:]       
    
reverse_python_dict(morsecode_map)
encode_morsecode('hello worlds')
decode_morsecode(encode_morsecode('hello worlds'))