How do you update variable in Class each time?

Question

I am trying to code a Class, which upon calling, for example: print(TimeNow.time_now) would print current time (but it's not realtime), as in, each time I call it, it doesn't return updated value.

If I tried this every time, it would make my code long, so I am trying to code it in a Class so that I can easily call it wherever I want to print time:

time_now = datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")
print(time_now)

Full code:

import datetime

command = ""

class TimeNow:
     time_now = datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")

while command != "quit":
    command = input("-> ").lower()

    if command == "1":
    
         print(TimeNow.time_now)

Does this answer your question? [In class object, how to auto update attributes?](https://stackoverflow.com/questions/14916284/in-class-object-how-to-auto-update-attributes) — mkrieger1, Jan 21 '22 at 00:18

score 1 · Answer 1 · answered Jan 21 '22 at 00:31

1

This method should work for what you want, but requires making an instance of TimeNow

import datetime

command = ""

class TimeNow:
    @property
    def time_now(self): 
        return datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")

instance = TimeNow()
    
while command != "quit":
    command = input("-> ").lower()
    if command == "1":
    
         print(instance.time_now)

answered Jan 21 '22 at 00:31

Cole Mollica

28
3

I get this in output: > – Cassano Jan 21 '22 at 00:36

score 1 · Accepted Answer · answered Jan 21 '22 at 00:51

1

This is not a good case for a class definition. A simple function will work:

def time_now():
     return datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")

print(time_now())

answered Jan 21 '22 at 00:51

Paul Cornelius

9,245
1
15
24

How do you update variable in Class each time?

2 Answers2