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@7of9

Python / dictionary > setdefault() > 辞書になかったら追加する

Last updated at Posted at 2017-04-18

@ Introducing Python: Modern Computing in Simple Packages by Bill Lubanovic
(No. 3118 / 12833)
Handle Missing Keys with setdefault() and defaultdict()

The setdefault() function is like get(), but also assigns an item to the dictionary if the key is missing:

試してみた。

away_team = { 'Tuvok': 1, "B'Elanna" : 2 }
print(away_team)
seven = away_team.setdefault("7of9", 3)
print(away_team)
print(seven)
run
{"B'Elanna": 2, 'Tuvok': 1}
{"B'Elanna": 2, 'Tuvok': 1, '7of9': 3}
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