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def append_words_to_file(file_name, words_to_add):
"""
Appends words to the end of a specified file.

Args:
file_name (str): The name of the file to append to.
words_to_add (str): The words to be appended.
"""
try:
with open(file_name, 'a') as file:
file.write(words_to_add)
print(f"Successfully appended '{words_to_add}' to '{file_name}'.")
except IOError as e:
print(f"Error appending to file: {e}")

Example usage:
file_to_modify = "my_document.txt"
new_content = " These are some new words."

Create the file if it doesn't exist (optional, 'a' mode creates it if missing)
with open(file_to_modify, 'w') as f:
f.write("This is the original content.")

append_words_to_file(file_to_modify, new_content)

You can also add a newline character if you want the appended text on a new line
append_words_to_file(file_to_modify, "\nAnd more words on a new line.")

To verify the content, you can read the file
with open(file_to_modify, 'r') as file:
content = file.read()
print("\nFile content after appending:")
print(content)
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