Python 3 Code to Find Frequency of Each Word in String

# Python code to find frequency of each word
def freq(str):

  # break the string into list of words
  str = str.split()    
  str2 = []

  # loop till string values present in list str
  for i in str:      

    # checking for the duplicacy
    if i not in str2:

      # insert value in str2
      str2.append(i)
      
  for i in range(0, len(str2)):

    # count the frequency of each word(present
    # in str2) in str and print
    print('Frequency of', str2[i], 'is :', str.count(str2[i]))  

def main():
  str ='apple mango apple orange orange apple guava mango mango'
  freq(str)          

if __name__=="__main__":
  main()       # call main function