Read data from file without blocking the system

Asked Feb 07 '17 at 11:01

Active Feb 07 '17 at 11:02

Viewed 277 times

I am new in Python, and I hope that someone can help me. I have the main loop. IN this loop I want to use data from a file. The main problem, that I need to do this without blocking all the system in between.

Example:

f=open("./filename.txt", "r")

while True:

    a=f.readline()
    print("Data: %s" %(a))
    time.sleep(1)

Output for example

Data: Hello
Data: Hello
Data: Hello
...
Until new data

Is it possible? I will be so appreciated for this. Any examples and help, please. Thanks.

edited Feb 07 '17 at 11:02

asked Feb 07 '17 at 11:01

user23441

1

I don't understand the question. Reading from a file doesn't block the system. – Barmar Feb 07 '17 at 11:03
You need to break out of the loop when you get to the end of the file. – Barmar Feb 07 '17 at 11:04
Blocking the system or blocking the main thread? – Mohammad Yusuf Feb 07 '17 at 11:05
Possible duplicate of [How should I read a file line-by-line in Python?](http://stackoverflow.com/questions/11555468/how-should-i-read-a-file-line-by-line-in-python) – Chris_Rands Feb 07 '17 at 11:05
I mean, If the file will be empty. I do not need to break. I need to read the file all the time. – user23441 Feb 07 '17 at 11:07
blocking the main thread – user23441 Feb 07 '17 at 11:09
1

Possible duplicate of [How can I tail a log file in Python?](http://stackoverflow.com/questions/12523044/how-can-i-tail-a-log-file-in-python) – tripleee Feb 07 '17 at 11:15

Read data from file without blocking the system

0 Answers0