how to delete file in python

import os
os.remove("filename.txt")

import os
import shutil

if os.path.exists("demofile.txt"):
  os.remove("demofile.txt") # one file at a time

os.rmdir("test_directory") # removes empty directory
shutil.rmtree("test_directory") # removes not empty directory and its content

import os
os.remove("demofile.txt") 

open('file.txt', 'w').close()

import os
os.remove("ChangedFile.csv")
print("File Removed!")

  import os
if os.path.exists("demofile.txt"):
  os.remove("demofile.txt")

  else:
  print("The file does not exist")