Purpose of the keyword "pass"

[buran]

the fourth line in the output shouldn't appear. In other word, even if we remove "pass" the output remains the same.

I think you mix pass with continue

for letter_num, letter in enumerate("Howdy!", start=1):
    if letter == "w":
        continue
    print('Letter ', letter_num, ' is ', letter)

Output:
Letter  1  is  H
Letter  2  is  o
Letter  4  is  d
Letter  5  is  y
Letter  6  is  !