Baking conversions in Python

bakingConversions.py

conversions = {
    'cup': 1,
    'ml': 236.588,
    'tbsp': 16,
    'tsp': 48
}

unitAlias = {
    'cups': 'cup',
    'mls': 'ml',
    'mililiter': 'ml',
    'mililiters': 'ml',
    'tsps': 'tsp',
    'teaspoon': 'tsp',
    'teaspoons': 'tsp',
    'tbsps': 'tbsp',
    'tablespoon': 'tbsp',
    'tablespoons': 'tbsp',
}

def convertToCups(unitToConvertFrom, amountOfUnit):
    conversionRate = conversions[unitToConvertFrom]
    numberOfCups = amountOfUnit/conversionRate
    return numberOfCups

def convertFromCups(unitToConvertTo, numberOfCups):
    conversionRate = conversions[unitToConvertTo]
    numberOfUnits = numberOfCups*conversionRate
    return numberOfUnits

def convertBetweenUnits(unitIn, amount, unitOut):
  if (unitOut == 'cup'):
    return convertToCups(unitIn, amount)
  elif (unitIn == 'cup'):
    return convertFromCups(unitOut, amount)
  else:
    cups = convertToCups(unitIn, amount)
    return convertFromCups(unitOut, cups)

def getOfficialUnitName(unit):
  if unit in conversions:
    return unit
  elif unit in unitAlias:
    officialUnitName = unitAlias[unit]
    return officialUnitName
  else:
    return False

def verifyNumericInput(input):
  try:
    inputAsANumber = float(input)
    if inputAsANumber > 0:
      return inputAsANumber
  except:
    return False

def getInput(prompt, inputValidator):
  validInput = False
  # do this instead of while True:
  while not validInput:
    userInput = input(prompt)
    validInput = inputValidator(userInput)
  return validInput

# main functions are pretty neat
def main():
  unitIn = getInput('What are you converting from?\n', getOfficialUnitName)
  amount = getInput('\nHow much do you have?\n', verifyNumericInput)
  unitOut = getInput('\nWhat are you converting to?\n', getOfficialUnitName)
  unitOutAmount = convertBetweenUnits(unitIn, amount, unitOut)

  print(f'{amount} ({unitIn}) => {unitOutAmount} ({unitOut})')

main()