python - Trying to learn basic for loop and/or if statement -


i have started learn python , wonder wrong loop and/or if statement.

i trying loop through list of words , if find word "right" want replace word "left". 

def left_join(phrases):                 """                      join strings , replace "right" "left"             """                     mlist = list(phrases)       word in mlist:          if word == "right":              word = "left"      output = ','.join(mlist)     return output      phrases = ("left", "right", "left", "stop") left_join(phrases)

i supposed

"left,left,left,stop"

but get

"left,right,left,stop"

so "right" not replaced "left". why?

quoting official documentation on loop,

an iterator created result of expression_list. suite executed once each item provided iterator, in order of ascending indices.

so mlist not change, word changed here


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