Sleep function is present in time module of python. It is very useful when you are trying to add some delay in program execution. It does not stop complete program instead it just adds some delay in particular thread only. We can understand it with some examples which you see below:
import time
#Example:1
sleep_time = 1
print("Hello")
time.sleep(sleep_time)
print("World")
#Example:2
print("Execution Begins: ", end="")
print(time.ctime())
time.sleep(5)
print("Execution Ends: ", end="")
print(time.ctime())
#Example:3
start_time = time.time()
for i in range(1,10):
print(i)
#add delay for 1 sec
time.sleep(1)
end_time = time.time()
execution_time = end_time - start_time
print("Total execution time: %s" % execution_time)
#Output
1
2
3
4
5
6
7
8
9
Total execution time: 9.00051474571228
#Example:4
import time
from threading import Thread
class Runner(Thread):
def run(self):
for i in range(0,7):
print(i)
time.sleep(1)
class Delay(Thread):
def run(self):
for i in range(20, 25):
print(i)
time.sleep(5)
print("Start of thread.")
Runner().start()
print("Start delay thread.")
Delay().start()
print("Program completed.")
#Output
Start of thread.
0
Start delay thread.
20
Program completed.
1
2
3
4
5
21
6
22
23
24
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