How can i change the time constantly - python-3.x

Question

Hi guys i am very new to python and i would very much appreciate some help on this matter, i have been trying to get the actual time with each record i send to the database but i think because it is a loop it seems to record the beginning time and loop it.
could anybody help me out with this?
HOW CAN I GET REAL TIME INSTEAD OF THE SAME TIME GETTING LOOPED
# Author: Aswin Ramamchandran
# Version: 1.1
from time import sleep
import datetime
import pymongo
import time
# This URL provides connection to the database
uri = blahblah
# initialising pymongo client
client = pymongo.MongoClient(uri)
# Database where the records will be saved - reference to the database
db = client.Kostenanalyse
# Accessing the collection "latenz" from the Database
coll = db.latenz
#Defining the Start time
start_time = datetime.datetime.now()
start_time = start_time.isoformat()
end = time.perf_counter()
def create_latenz_data()-> dict:
return {
"Temperature" : "",
"Time when packet was sent" : start_time,
"Sensor A reading" : "",
"Latency" : end,
}
#While loop
while True:
data = create_latenz_data()
start = time.perf_counter()
coll.insert_one(data)
end = time.perf_counter() - start
print('{:.6f}s for the calculation'.format(end))
print(str(start_time) + 'Wrote data sample {} to collpipection {}'.format(data, 'latenz'))
sleep(0.5)

Answer 1

Your script stores the start_time variable at load and does not change it. As you have used that same variable inside while loop and inside create_latenz_data(), replacing start_time with datetime.datetime.now().isoformat() directly so new time is picked everytime it is called.
from time import sleep
import datetime
import pymongo
import time
# This URL provides connection to the database
uri = blahblah
# initialising pymongo client
client = pymongo.MongoClient(uri)
# Database where the records will be saved - reference to the database
db = client.Kostenanalyse
# Accessing the collection "latenz" from the Database
coll = db.latenz
def create_latenz_data()-> dict:
return {
"Temperature" : "",
"Time when packet was sent" : datetime.datetime.now().isoformat(),
"Sensor A reading" : "",
"Latency" : end,
}
#While loop
while True:
data = create_latenz_data()
start = time.perf_counter()
coll.insert_one(data)
end = time.perf_counter() - start
print('{:.6f}s for the calculation'.format(end))
print(str(datetime.datetime.now().isoformat()) + 'Wrote data sample {} to collpipection {}'.format(data, 'latenz'))
sleep(0.5)