70 — Game: a reaction time test

A reaction test must know when GO appeared and when you pressed Enter; time.time() clocks seconds, so two readings measure the gap.

#Steps

1. time.time() returns seconds since a fixed moment; read it before and after input() and subtract:

   import time
   start = time.time()
   input()
   elapsed = time.time() - start
   show f"You took {elapsed:.2f} seconds"
   

   copyrun it →

   Piped Enter is instant, so a piped run reports about 0.00.

2. A fixed wait lets you time your click; a random delay fixes that:

   use random latest
   import time
   show "waiting..."
   time.sleep(random_number(1, 3))
   show "GO!"
   

   copyrun it →

   time.sleep(seconds) pauses; random_number(1, 3) picks the wait.

3. The full program runs three rounds and keeps the fastest, with a 0.1 sleep for fast piped tests. Use random_number(1, 3) for a real game:

   # reaction.nme — measure your reaction time over rounds.
   # Run: nme r reaction
   # time.time() clocks the moment; the best round wins.
   
   import time
   
   rounds = 3
   best = None
   total = 0
   
   show "Reaction test — press Enter as soon as you see GO."
   show f"We play {rounds} rounds; the fastest one wins."
   show "An early press is a false start — wait for GO."
   input()
   for round_number in range(1, rounds + 1):
       show f"Round {round_number} of {rounds}: get ready..."
       time.sleep(0.1)
       show "GO!"
       start = time.time()
       input()
       elapsed = time.time() - start
       total = total + elapsed
       show f"  You took {elapsed:.2f} seconds."
       if best is None or elapsed < best:
           best = elapsed
           show "  That is the new best time!"
       else:
           show f"  The best is still {best:.2f} seconds."
   
   show ""
   show "Final results:"
   show f"  Best time:   {best:.2f} seconds"
   average = total / rounds
   show f"  Average:     {average:.2f} seconds"
   

   copyrun it →
4. Run it, piping one empty line for the ready prompt plus one per round:

   printf '\n\n\n\n' | nme r reaction
   

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   Reaction test — press Enter as soon as you see GO.
   We play 3 rounds; the fastest one wins.
   An early press is a false start — wait for GO.
   Round 1 of 3: get ready...
   GO!
     You took 0.00 seconds.
     That is the new best time!
   Round 2 of 3: get ready...
   GO!
     You took 0.00 seconds.
     The best is still 0.00 seconds.
   Round 3 of 3: get ready...
   GO!
     You took 0.00 seconds.
     The best is still 0.00 seconds.
   
   Final results:
     Best time:   0.00 seconds
     Average:     0.00 seconds
   

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5. best = None means "no round yet"; if best is None or elapsed < best keeps the smallest time; piped rounds all tie at 0.00 and vary by tiny fractions.

#Try it yourself

Raise rounds to 5, or print the average. Change the delay to time.sleep(random_number(1, 3)) and run with a real keyboard.

#What you learned

• time.time() returns the current clock in seconds; subtract two readings to measure a gap.
• time.sleep(seconds) pauses the program.
• random_number(1, 3) / 1부터 3까지 랜덤정수 makes the delay unpredictable.
• best = None then if best is None or elapsed < best keeps the smallest time across rounds.