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Ruby なら Safe Navigation Operator があるのでもっとラクです
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```ruby
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const fb = obj["facebook"]&.["token"];
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const fb = obj["facebook"]&.["token"]; # => 'xxx'
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const tw = obj["twitter"]&.["token"];
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const tw = obj["twitter"]&.["token"]; # => nil
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const ig = obj["instgram"]&.["token"];
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const ig = obj["instgram"]&.["token"]; # => nil
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```
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Python3 ではこのように書くしかないんでしょうか
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非常に冗長で読みにくいです
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```python
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const fb = obj["facebook"]["token"] if "facebook" in obj and "token" in obj["facebook"] else None
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const fb = obj["facebook"]["token"] if "facebook" in obj and "token" in obj["facebook"] else None # => 'xxx'
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const tw = obj["twitter"]["token"] if "twitter" in obj and "token" in obj["twitter"] else None
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const tw = obj["twitter"]["token"] if "twitter" in obj and "token" in obj["twitter"] else None # => None
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const ig = obj["instagram"]["token"] if "instagram" in obj and "token" in obj["instagram"] else None
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const ig = obj["instagram"]["token"] if "instagram" in obj and "token" in obj["instagram"] else None # => None
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```
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煩雑なのでもっと簡易な書き方があれば教えてください
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