Add exercises 27

Signed-off-by: Manuel Vergara <manuel@vergaracarmona.es>

30-days-of-python/27_Python_con_MongoDB/08_delete_doc.py

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+"""
+Buscar en la base de datos con query
+"""
+
+from pymongo.mongo_client import MongoClient
+from pymongo.server_api import ServerApi
+from flask import Flask, render_template
+import os
+from dotenv import load_dotenv
+from bson.objectid import ObjectId
+
+load_dotenv()
+# variables .env
+mongopass = os.getenv('mongopass')
+mongouser = os.getenv('mongouser')
+mongoname = os.getenv('mongoname')
+
+uri = "mongodb+srv://" + \
+    mongouser + ":" + \
+    mongopass + "@" + \
+    mongoname + ".m697hfm.mongodb.net/?retryWrites=true&w=majority"
+
+client = MongoClient(uri, server_api=ServerApi('1'))
+
+db = client.pruebas_mongodb
+
+# Delete one document
+query = {'name': 'John'}
+db.students.delete_one(query)
+
+# Delete many documents
+for student in db.students.find():
+    print(student)
+
+for student in db.students.find():
+    print(student)
+
+# Drop collection
+db.students.drop()
+
+app = Flask(__name__)
+if __name__ == '__main__':
+    # for deployment we use the environ
+    # to make it work for both production and development
+    port = int(os.environ.get("PORT", 5000))
+    app.run(debug=True, host='0.0.0.0', port=port)