TypeError (can't concatenate NoneType to str)

Question

def emoji_convert(massage):
    split_words = massage.split(" ")
    emoji = {
        ":)": " 😁",
        ":(": " 😞",
        ":": " 😶",
        ":|": " 😐"
    }
    output = ""
    for words in split_words:
        output += emoji.get(words)
    return output


massage=(input("> "))
print(emoji_convert(massage))

get this type error

    output += emoji.get(words)
TypeError: can only concatenate str (not "NoneType") to str

Answer 1

The quickest fix is to change the default when emoji doesn't have a match from None to instead an empty string:

output += emoji.get(words, '')

...or, to pass the word through unmodified (but for a leading space) when it isn't found:

output += emoji.get(words, ' ' + words)

You might also consider generating your output as a list, and converting that list to a string right before returning it, thus more properly mirroring the split() you did earlier.

def emoji_convert(message):
    split_words = message.split(" ")
    emoji = {
        ":)": "😁",
        ":(": "😞",
        ":":  "😶",
        ":|": "😐",
    }
    output = []
    for word in split_words:
        output.append(emoji.get(word), word)
    return ' '.join(output)

message = input("> ")
print(emoji_convert(message))