CODEWITHSUNDEEP
python
phales15
phales15

Reputation: 465

Python 2.7 While Loop time

while True:
    now = datetime.datetime.now()
    if now.second == 1:
        print "One"

my program print One about 7 times. How do I make it print only once?

Upvotes: 0

Views: 1443

Answers (2)

Mariusz Jamro
Mariusz Jamro

Reputation: 31633

How about storing the value previously used for printing?

previous = None
while True:
    now = datetime.datetime.now()
    if now.second == 1 and now.second != previous:
        print "One"
        previous = now.second # store the last value

Upvotes: 0

eumiro
eumiro

Reputation: 212835

Your computer is too fast.

It takes the current time, tests whether the current second is one and then again. And since it is so fast it can do this within less than one second, you get more lines of output.

Make it wait after each iteration:

while True:
    now = datetime.datetime.now()
    if now.second == 1:
        print "One"
        time.sleep(59) # wait 59 seconds after success
    time.sleep(1) # wait 1 second after each fail

This program will sleep most time. If you want it to do anything useful, it will be a different program.

Upvotes: 2

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