一. 测试题
- 请问一下代码会打印多少次“I love you”
while 'C':
print("I love you")
死循环，会一直打印，因为while后面的条件永远为真
不妨试试如下程序：
while '':
print('looping')
print('out')
while False:
print('looping')
print('out')
while 0:
print('looping')
print('out')
- 请问一下代码会打印多少次“I love you”
i = 10
while i:
print("I love you")
i = i - 1
#所以i = 0的时候程序就会停止
会打印十次
- python3中，一个语句可以分成多行书写吗？
#可以用反斜杠或者括号分解
>>> 3 > 4 and \
1 < 2
False
>>> ( 3 > 4 and
1 < 2)
False
二. 动动手
-
实现图中功能
#个人代码
num = int(input("Please input a number:"))
while num > 0:
print(' ' * (num - 1) + '*' * num)
num = num -1
#参考代码
temp = input("Please input a number:")
number = int(temp)
while number:
i = number - 1
while i:
print(' ', end = '')
i = i - 1
j = number
while j:
print('*', end = '')
j = j - 1
print()
number = number - 1
-
实现图中功能
#个人代码
num = int(input("Please input an integer:"))
for i in range(1, num + 1):
print(i)
#参考代码
temp = input("Please input an integer:")
number = int(temp)
i = 1
while number:
print(i)
i = i + 1
number = number - 1
- 修改02章中的小游戏，要求为用户提供三次机会尝试，机会用完或者用户猜中答案均退出循环
#个人代码
import random
secret = random.randint(1, 10)
guess = int(input("Guess a number:"))
guess_number = 3
if guess == secret:
print("Awesome!")
while guess != 8 and guess_number > 0:
guess = int(input("Guess again:"))
if guess == secret:
print("Awesome")
else:
if guess < secret:
print("smaller!")
else:
print("Bigger!")
guess_number = guess_number - 1
print("Game over.")
#参考代码
import random
times = 3
secret = random.randint(1, 10)
guess = 0
#这里先给guess赋值(赋一个绝对不等于secret的值)
print("Guess a number:", end = " ")
#print()默认打印完字符会自动添加一个换行符，end = " "参数告诉print()用空格代替换行
while guess != secret and times > 0:
temp = input()
guess = int(temp)
times = times - 1
if guess == secret:
print("Awesome!")
else:
if guess > secret:
print("Bigger!")
else:
print("Smaller!")
if times > 0:
print("Try again:", end = " ")
else:
print("Sorry, opportunities are out!")
print("Game over.")
