Write one function in python 3. Need ASAP please

Function name: most_similar Parameters: word (string), a (string), b (string) Returns: string Description: Determine whether a or b is more similar to word. First, calculate the similarity between a and word. Then calculate the similarity between b and word. Return whichever string (a or b) is more similar to the word. If both are equally similar, then return a. The values passed in for word, a, and b will all be the same length. The similarity between 2 strings is simply the number of characters which are the same when you read the strings from left to right. For example: plants' and 'planes' similarity is 5 plants' and 'alarms similarity is 3 planes' is more similar to plants' than 'alarms' so most_similar( plants, planes' alarms') would return 'planes >>> most_similar( 'malfoy potter 'hagrid') hagrid' >>most_similar('boombox', coalbox', 'booming') coalbox