updated after review.

app.py

 # database connection
 from scripts.config.connect import db_connect
-from scripts.core.handlers.crud_ops import insert, select, delete_one, update_one, update_many, delete_many
+from scripts.core.handlers.crud_ops import insert, select, delete_one, update_one, update_field, edit_field
 
 db = db_connect()
-# insert(db)
-# delete_one(db)
-# delete_many(db)
-select(db)
-update_one(db)
-# update_many(db)
+ch = True
+while ch:
+    choice = int(input("enter your choice\n1.insert\n2.read\n3.delete"
+                       "\n4.update\n5.update with new field score\n6.update score field"))
+    if choice == 1:
+        insert(db)
+        print("data inserted")
+    elif choice == 2:
+        select(db)
+    elif choice == 3:
+        delete_one(db)
+        print("data deleted")
+    elif choice == 4:
+        update_one(db)
+        print("data updated")
+    elif choice == 5:
+        update_field(db)
+    elif choice == 6:
+        edit_field(db)
+        print("field value updated")

conf/application.conf

+[mongo]
+uri_path=mongodb://localhost:27017
\ No newline at end of file

scripts/config/application_config.py

+import configparser
+
+try:
+    config = configparser.ConfigParser()
+    config.read("conf/application.conf")
+    # mongo uri
+    uri = config.get("mongo", "uri_path")
+except configparser.NoOptionError:
+    print("could not find conf file")

scripts/config/connect.py

 import pymongo
 
+from scripts.config.application_config import uri
+
 
 def db_connect():
     try:
         # create mongo client
-        client = pymongo.MongoClient("mongodb://localhost:27017")
+        client = pymongo.MongoClient(uri)
         # create database
-        database = client['Students']
+        database = client["Students"]
         # create student collection
-        student = database['Student']
+        student = database["student"]
         return student
     except Exception as e:
         print("Error:", str(e))
-

scripts/constants/db_constants.py

+# db_name =students
+# collection_name = student

scripts/core/handlers/crud_ops.py

@@ -6,7 +6,6 @@ def insert(student):
         age = int(input("enter your age"))
         dept = input("enter your department")
         student.insert_many([{"RollNo": rn, "f_name": f_name, "l_name": l_name, "Age": age, "Department": dept}])
-        print("Inserted")
     except Exception as e:
         print(str(e))
 
@@ -15,7 +14,6 @@ def delete_one(student):
     try:
         data = int(input("enter the id of the document"))
         student.delete_one({"RollNo": data})
-        print("data deleted")
     except Exception as e:
         print(str(e))
 
@@ -37,14 +35,43 @@ def select(student):
 
 def update_one(student):
     try:
-        update = {"$set": {"l_name": "C"}}
-        student.update_one({"f_name": "Sanal"}, update)
+        user_id = int(input("enter user roll no."))
+        db_field = input("enter the field you want to update")
+        field_data = input("enter the data")
+        update_doc = {"$set": {db_field: field_data}}
+        student.update_many({"RollNo": user_id}, update_doc)
     except Exception as e:
         print(str(e))
 
 
-def update_many(student):
+# update collection with new field score
+def update_field(student):
     try:
-        student.update_many({"f_name": "Gopika"}, {"$set": {"Department": "MCA"}})
+        rn = int(input("enter the roll number"))
+        cricket = int(input("enter the score of cricket"))
+        football = int(input("enter the score of football"))
+        volleyball = int(input("enter the score of volleyball"))
+        student.update({"RollNo": rn},
+                       {"$set":
+                            {"sports":
+                                 {"cricket": cricket, "football": football, "volleyball": volleyball
+                                  }
+                             }
+                        }
+                       )
+        print("new filed score added to student")
+    except Exception as e:
+        print(str(e))
+
+
+def edit_field(student):
+    try:
+        rn = int(input("enter the roll number"))
+        doc = student.find_one({"RollNo": rn})
+        field = input("enter the field you want to update")
+        # if field == cricket:
+        value = int(input("enter the score"))
+        doc['sports'][field] = value
+        student.save(doc)
     except Exception as e:
         print(str(e))