find_one_and_replace() method search one document if finds then replaces with the given second parameter inMongoDb.find_one_and_replace() method is differ fromfind_one_and_update() with the help of filter it replace the document rather than update the existing document.

Syntax: 

find_one_and_replace(filter, replacement, projection=None, sort=None, return_document=ReturnDocument.BEFORE, session=None, **kwargs)

Parameters 
filter: A query for replacement of a matched document. 

• replacement: replacement document. 
• projection: it is optional.A list of a field that should be returned in the result. 
• sort: key, direction pair for the sort order of query. 
• return_document: ReturnDocument.BEFORE (default) will return the original document without replacement. ReturnDocument.AFTER will return the replaced or inserted document.
  **kwargs: Additional commands. 

Sample database used in all the below examples:

Example 1: 

importpymongo# establishing connection# to the databaseclient=pymongo.MongoClient("mongodb://localhost:27017/")# Database namedb=client["mydatabase"]# Collection namecol=db["gfg"]# replace with the help of# find_one_and_replace()col.find_one_and_replace({'coursename':'SYSTEM DESIGN'},{'coursename':'PHP'})# print the document after replacementforxincol.find({},{"_id":0,"coursename":1,"price":1}):print(x)

Output:

Example 2: 

importpymongo# establishing connection# to the databaseclient=pymongo.MongoClient("mongodb://localhost:27017/")# Database namedb=client["mydatabase"]# Collection namecol=db["gfg"]# replace with the help of# find_one_and_replace()col.find_one_and_replace({'price':9999},{'price':19999})# print the document after replacementforxincol.find({},{"_id":0,"coursename":1,"price":1}):print(x)

Output: 

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