working with Python Dictionary

That is because the word is not in dictionary. You probably want to use:

emoh.get(word, word)

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also in the first print. The first word is used as a key to the dictionary. If it is not in the dictionary, the second value is used as a default. So, or the word is translated, or you get the same word -- as you do it correctly in the next command.

A side note: Python strings are immutable. This means that they cannot be modified. This means that the output += emoh.get(word, word) always constructs a new string and throws away the older content. That can be very inefficient if you use large texts.

in this code, you have used get keyword for getting the value of a key from the dictionary. if a key is present in the dictionary then this will give you value else it will give you none.
in this code you have used "print(emoh.get(word))" here it is giving you "None" because that word is not present in "emoh".

As other two experts mentioned, you are getting None because the keys you are trying to find in the dictionary don't exist.

The keys in the dictionary which exist are ":)" and ":(" whereas you are trying to find the keys "aaaa" and "bbbb" assuming your input was "aaaa bbbb" which don't exist at all in the dictionary.

Assuming your input is "aaaa bbbb" or two words separated by a space, the following code will give you the desired output.

message=input(">")
words=message.split(' ')
print (words)

emoh={
    words[0]:"😂",
    words[1]:"😒"
}
output=""
for word in words:
    print(word,word,word,word,word)
    print (emoh.get(word))
    output+= (emoh.get(word,word))
print (output)

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Thank you Guys! I will test it later