style: format code with autopep8

Format code with autopep8

This commit fixes the style issues introduced in 6842a19 according to the output
from Autopep8.

Details: None

Author: deepsource-autofix[bot]

N-Grams NLP/script.py

@@ -3,19 +3,22 @@
 import nltk
 nltk.download('punkt')
 
+
 def gen_ngrams(txt, n):
     tokens = word_tokenize(txt)
     ngs = list(ngrams(tokens, n))
     return ngs
 
+
 def main():
     u = input("Enter a sentence: ")
     n = int(input("Enter the value of n for n-grams: "))
-    
+
     ngs = gen_ngrams(u, n)
-    
+
     print(f"Input Sentence: {u}")
     print(f"{n}-grams: {ngs}")
 
+
 if __name__ == "__main__":
     main()