What is the use of “else” after “for” loop in Python? [duplicate]

Answer 1

This was originally enacted in order to get rid of all the "GOTO" statements in procedures without using flags: It means "NO BREAK"

for i, value in enumerate(sequence):
    if value == target:
    break
else:           #<-- if we finish the loop and did not encounter break, return -1
    return -1
return 1        #<-- if we did encounter break, return 1

You can watch Raymond Hettinger's Pycon talk that mentions the for/else construct here: Transforming Code into Beautiful, Idiomatic Python, http://pyvideo.org/video/1780/transforming-code-into-beautiful-idiomatic-pytho