file close in python code example

Example 1: python close gile

with open(filename) as f:
  #use file

 #close file
f.close()

Example 2: do i need to close a file in python3 in with statement

with open('/etc/passwd') as f:
    for line in f:
        print(line)
# by using with statement u have no need to close the file.it auto exists after its use.