If you want to use field names with hyphens when updating firestore data in python

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TL;DR Surround with back quotes!

db.collection('users').document('AAAAABBBBB').update({
   u"status.`xxxx-yyyyy-zzzz`": "hogehoge"
})

Commentary

If you write the code below with the usual glue, it will get stuck.

db.collection('users').document('AAAAABBBBB').update({
   u"status.xxxx-yyyyy-zzzz": "hogehoge"
})

ValueError: Non-alphanum char in element with leading alpha: xxxx-yyyyy-zzzz

reference

https://github.com/googleapis/google-cloud-python/issues/8086

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