def count_word_occurrences(file_path, target_word):
    try:
        with open(file_path, 'r') as file:
            text = file.read()
            occurrences = text.count(target_word)
            return occurrences
    except FileNotFoundError:
        print(f"File '{file_path}' not found.")
        return -1

file_path = 'example.txt'
target_word = 'python'
result = count_word_occurrences(file_path, target_word)
print(f"The word '{target_word}' occurs {result} times in the file.")