"""wo module. Contains function: words_occur()""" 
# interface functions
def words_occur():
    """words_occur() - count the occurrences of words in a file."""
    # Prompt user for the name of the file to use.
    file_name = input("Enter the name of the file: ")
    # Open the file, read it and store its words in a list.
    f = open(file_name, 'r')
    word_list = f.read().split()
    f.close()
    # Count the number of occurrences of each word in the file.
    occurs_dict = {}
    for word in word_list:
        # increment the occurrences count for this word
        occurs_dict[word] = occurs_dict.get(word, 0) + 1
    # Print out the results.
    print("File %s has %d words (%d are unique)" \
      % ( file_name, len(word_list), len(occurs_dict) ))
    print(occurs_dict)
if __name__ == '__main__':
    words_occur()