I am looking for a way to increment and update a firestore field in Python.  

Seems like incremental feature is added in recently google-cloud-firestore 1.2.0 . [issue-7533](https://github.com/googleapis/google-cloud-python/issues/7533)! How can this be implemented in python? Any sample implementation reference code will be really helpful.

```
from google.cloud import firestore
......
upd_ref_path.update({u'test_col': firestore.FieldValue.increment(1)})

```

I got following error message
error: AttributeError: module 'google.cloud.firestore' has no attribute 'FieldValue'

UPDATE - 

This feature needs an enchantment to use if from firestore module. Issue - 
[issue-8173](https://github.com/googleapis/google-cloud-python/issues/8173)!
 is opened for this. 

For temp solution use as below:

```
from google.cloud.firestore_v1 import Increment
doc_ref.set({u'test_col': Increment(1)}, merge=True)

```