像这样尝试，使用continue退出循环的当前迭代，并在循环的顶部重新开始。在
你还有一个逻辑错误：if guess <= 1 and guess >= 20 and guess not in already_guessed:
一个数字不能同时小于或等于1，也不能大于或等于20。您的and应该是这样的or：
^{pr2}$
或者更简单：if 1 <= guess <= 20 and guess not in already_guessed:
另外，将你的try/except只放在可能引发异常的情况下（或者在发生异常时不应该发生：from random import randint
import sys
name = raw_input("Hello! What's your name? ")
print "Well {}, I'm thinking of a number between 1 and 20.".format(name)
print "Since I'm a benevolent computer program, I'll give you 6 guesses."
secret_number = randint(1, 20)
guesses_left = 6
already_guessed = []
while guesses_left > 0:
print "You have {} guesses left!".format(guesses_left)
try:
guess = int(raw_input("Take a guess: "))
except ValueError:
print "Invalid input! Please try again!\n"
continue
# If the number is not between 1 and 20...
if not (1 <= guess <= 20):
print "Not a number between 1 - 20!"
print "Please try again!\n"
continue
if guess in already_guessed:
print "You already guessed that!\n"
continue
guesses_left -= 1
already_guessed.append(guess)
if guess == secret_number:
print "You win! {} was my secret number!".format(secret_number)
sys.exit(0)
elif guess < secret_number:
print "Your guess is too low!\n"
elif guess > secret_number:
print "Your guess is too high!\n"
下面是一个运行示例：Hello! What's your name? :)
Well :), I'm thinking of a number between 1 and 20.
Since I'm a benevolent computer program, I'll give you 6 guesses.
You have 6 guesses left!
Take a guess: 2
Your guess is too low!
You have 5 guesses left!
Take a guess: 2
You already guessed that!
You have 5 guesses left!
Take a guess: 3
Your guess is too low!
You have 4 guesses left!
Take a guess: 7
Your guess is too high!
You have 3 guesses left!
Take a guess: 5
Your guess is too high!
You have 2 guesses left!
Take a guess: 4
You win! 4 was my secret number!
