Mar 13, 2022
diff --git a/ch08-conditional-logic/8c-challenge-simulate-a-coin-toss-experiment.py b/ch08-conditional-logic/8c-challenge-simulate-a-coin-toss-experiment.py
 # 4. After the first toss, you'll need another loop to keep flipping while you
 #    get the same result as the first flip.

 import random


 def single_trial():
    """Simulate repeatedly a coing  until both heads and tails are seen."""
    # This function uses random.randint() to simulate a single coin toss.
    # randing(0, 1) randomly returns 0 or 1 with equal probability. We can
    # use 0 to represent heads and 1 to represent tails.

    # Flip the coin the first time
    flip_result = random.randint(0, 1)
    # Keep a tally of how many times the coin has been flipped. We've only
    # flipped once so the initial count is 1.
    flip_count = 1

    # Continue to flip the coin until randint(0, 1) returns something
    # different than the original flip_result
    while flip_result == random.randint(0, 1):
        flip_count = flip_count + 1

    # The last step in the loop flipped the coin but didn't update the tally,
    # so we need to increase the flip_count by 1
    flip_count = flip_count + 1
    return flip_count
 # Here is a simpler-to-read thus more pythonistic version, I think :P

 import random

 def flip_trial_avg(num_trials):
    """Calculate the average number of flips per trial over num_trials total trials."""
    total = 0
    for trial in range(num_trials):
        total = total + single_trial()
    return total / num_trials
 def coin_flip_trial():
    heads = 0
    tails = 0
    tries = 0
 # As long as heads OR tails are zero, we have not had one of each.
    while heads == 0 or tails == 0:
        result = random.randint(0,1)
        tries = tries + 1
        if result == 1:
            heads = heads + 1
        else:
            tails = tails + 1
    return tries

 # So let's now do that 10,000 times and then report the average number of trials it took.
 tries_needed = 0
 for x in range(10_000):
    tries_needed = tries_needed + coin_flip_trial()

 print(f"It takes on average {tries_needed / 10_000:.2f} tries to get both a heads and a tails.")


 print(f"The average number of coin flips was {flip_trial_avg(10_000)}")
Original file line number	Diff line number	Diff line change
Expand Up		@@ -12,38 +12,29 @@
		# 4. After the first toss, you'll need another loop to keep flipping while you
		# get the same result as the first flip.

		import random


		def single_trial():
		"""Simulate repeatedly a coing until both heads and tails are seen."""
		# This function uses random.randint() to simulate a single coin toss.
		# randing(0, 1) randomly returns 0 or 1 with equal probability. We can
		# use 0 to represent heads and 1 to represent tails.

		# Flip the coin the first time
		flip_result = random.randint(0, 1)
		# Keep a tally of how many times the coin has been flipped. We've only
		# flipped once so the initial count is 1.
		flip_count = 1

		# Continue to flip the coin until randint(0, 1) returns something
		# different than the original flip_result
		while flip_result == random.randint(0, 1):
		flip_count = flip_count + 1

		# The last step in the loop flipped the coin but didn't update the tally,
		# so we need to increase the flip_count by 1
		flip_count = flip_count + 1
		return flip_count
		# Here is a simpler-to-read thus more pythonistic version, I think :P

		import random

		def flip_trial_avg(num_trials):
		"""Calculate the average number of flips per trial over num_trials total trials."""
		total = 0
		for trial in range(num_trials):
		total = total + single_trial()
		return total / num_trials
		def coin_flip_trial():
		heads = 0
		tails = 0
		tries = 0
		# As long as heads OR tails are zero, we have not had one of each.
		while heads == 0 or tails == 0:
		result = random.randint(0,1)
		tries = tries + 1
		if result == 1:
		heads = heads + 1
		else:
		tails = tails + 1
		return tries

		# So let's now do that 10,000 times and then report the average number of trials it took.
		tries_needed = 0
		for x in range(10_000):
		tries_needed = tries_needed + coin_flip_trial()

		print(f"It takes on average {tries_needed / 10_000:.2f} tries to get both a heads and a tails.")


		print(f"The average number of coin flips was {flip_trial_avg(10_000)}")