To add a delay to your Python code you can use the sleep() function from Python's time module.
import time
countdown = [3, 2, 1, 'Go!!!']
for item in countdown:
print(item)
time.sleep(1)
# 3
# 2
# 1
# Go!!!
The sleep module takes a single argument. This can be either an integer for the number of seconds to sleep or a float if you want to have sub-second resolution such as 0.5 of a second, 1.75 seconds and so on. Using the sleep() function suspends the processing of the thread which uses almost no processing power and allows other processes to run while it sleeps.
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