Reputation: 39
So I'm trying to implement a timing routine and I need to return the seconds (secs) so that my timing routine starts my lights. The original code that I researched got me fairly far:
from datetime import datetime
from threading import Timer
x=datetime.today()
y=x.replace(day=x.day+1, hour=1, minute=0, second=0, microsecond=0)
delta_t=y-x
secs=delta_t.seconds+1
def hello_world():
print "hello world"
#...
t = Timer(secs, hello_world)
t.start()
The only issue is that I took in the x.replace as a user input variable and now I get the error "TypeError: unsupported operand type(s) for -: 'datetime.time' and 'datetime.time'"
I understand it's because you can't directly subtract two datetime.datetime.time() directly but I'm unsure on how to convert them into something that I can operate with. Here's my code so far
import datetime
from threading import Timer
import tkinter as tk
import time
# =============================================================================
# userInput takes a formatted input and passes it back to main.
# =============================================================================
def userInput():
try:
a = datetime.datetime.strptime(input('When would you like to routine to start in HH:MM 24 hour format: '), "%H:%M").time()
print (a.strftime("%H:%M"))
except:
print ("Please enter correct time in HHMM format")
return a
# =============================================================================
# timeComparator is a function which, if the user changes any settings or chooses
# start in the middle of a cycle, implements the correct routine depending on where
# in the cycle it's in.
# =============================================================================
def timeComparator(a):
now = datetime.datetime.now().time()
#this obtains the current time
#if statement compares input from
print("the time now is: ", now)
if (now < a):
print ("hello human")
elif (now > a):
print ("hello plant")
# =============================================================================
# This routine is hard coded and cannot be changed by the user. It assumes that
# there will be a total of 12 hours of light with the last hour, in other words
# the last 8% of light, shifting from a natural blue hue to a more red hue.
# The auto routine will start at 8am and end at 8pm. By ending, the routine
# stops light shifting and finally at 830PM, the lights turn off.
# NOTE NOTE NOTE NOTE NOTE
# This is NOT the actual light routine. This is JUST function that records
# the time and returns the seconds that begins the start command for the lights
# =============================================================================
def autoRoutine(a):
now = datetime.datetime.now().time()
#this is the start of the auto routine
start=a
delta_t = start-now
secs = delta_t.seconds+1
return secs
def blueFade():
print("the lights are starting")
# =============================================================================
# Main function. Will be used to call all other functions
# =============================================================================
if __name__=="__main__":
a = userInput()
timeComparator(a)
secs = autoRoutine(a)
lights = Timer(secs, blueFade)
lights.start()
So at the end of the day, I'm unable to operate the code line
delta_t = start-now
and because of this I can't begin the lights.start() function. I have tried using time.strptime to compare but I haven't been successful as well as time.mktime()
Upvotes: 0
Views: 98
Reputation: 1830
To determine the delta in seconds from now()
and a time constructed from hours and minutes we can use time.hour
, time.minute
and time.second
attributes.
The issue in the question's code is that it is trying to do subtraction on two datetime.time objects
def autoRoutine(a):
now = datetime.datetime.now().time()
#this is the start of the auto routine
start=a
delta_t = start-now
secs = delta_t.seconds+1
return secs
This produces:
File "<ipython-input-18-98011edfef89>", line 65, in autoRoutine
delta_t = start-now
TypeError: unsupported operand type(s) for -: 'datetime.time' and 'datetime.time'
To correct we can convert datetime.time
to seconds. See convert-datetime-time-to-seconds
Applying this answer to your question we have:
def autoRoutine(a):
now = datetime.datetime.now().time()
startSeconds = ((a.hour * 60) + a.minute) * 60
nowSeconds = (((now.hour * 60) + now.minute) * 60) + now.second
startSeconds - nowSeconds
Upvotes: 1