I was asked if I could perform this wonderful and famous chanson at a gig next November. Listening to the Yves Montand and Edith Piaf versions, I thought, "Very lovely. How would this be done on the diatonic?" Then I found the following performance of the tune by Anders Johansson. I might need to take a few days off after that. Wow.
UPDATE: I have taken the time to learn this. My first serious attempt is HERE.