name error

I’m a beginner programmer trying to work with Natural Language Toolkit (nltk) in Python but every time I run my code, I keep getting the error message “NameError: name ‘nltk’ is not defined”. I have tried looking through the documentation and searching online for a solution, but none of the suggestions I came across worked for me.
Here is a snippet of my code:

import nltk
from nltk.tokenize import word_tokenize
text = "This is a sample sentence."
tokens = word_tokenize(text)
print(tokens)

When I run this code, I keep getting the error message mentioned above. I have also tried installing and reinstalling nltk using the pip install command, but it still does not work. I have also checked that I have Installed the necessary dependencies like numpy, however, the error still persists. From the error message, it looks like Python is unable to recognize the nltk module. I would appreciate any help in resolving this issue.