文章目录
第六章 输入与while循环
6.1 函数input()的工作原理
函数input()让程序暂停运行，等待用户输入一些文本。获取用户输入后，Python将其存储在一个变量中。
name = ''
name = input("who are you?")
print("Hello, " + name + "!")
who are you?
输入：tim
输出：
Hello, tim!
函数input()接受一个参数：即要向用户展示的提示或说明。
程序等待用户输入，在用户按回车键后继续运行。
6.1.1 用int()获取数值输入
使用函数input()时，Python会将用户输入解读为字符串。
可以使用int()函数，让Python将参数汇总的的字符串转化为数值。（与str()对应）
age = ''
age = input("How old are you?\n")
age = int(age)
if age >= 18:
print("You are an adult.")
输入：19
输出：You are an adult.
6.2 while循环
num = 1
while num <= 5:
print(num)
num += 1
1
2
3
4
5
s = input("i am a repeater\n")
while s != 'quit'
print(s)
s = input()
复读机，直到用户输入quit停止
flag = True
count = 5
while flag:
print(count)
count -= 1
if count < 0:
flag = False
5
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3
2
1
0
6.2.1 在循环中使用break和continue
while True:
s = input()
if s == 'quit':
break
print("You just inputed " + s)
复读机，直到输入quit
continue不多赘述，与C语言作用相同
6.3 用while循环来处理列表和字典
6.3.1 在列表之间移动元素
target = ['apple', 'bannana', 'peach']
shopping_car = []
while target:
cur = target.pop()
print("Buy " + cur)
shopping_car.append(cur)
print("You have bought these:")
print(shopping_car)
print("These not bought:")
print(target)
Buy peach
Buy bannana
Buy apple
You have bought these:
[‘peach’, ‘bannana’, ‘apple’]
These not bought:
[]
6.3.2 删除所有列表中的特定值
fruits = ['apple', 'orange', 'peach', 'apple', 'apple']
while 'apple' in fruits:
fruits.remove('apple')
print(fruits)
[‘orange’, ‘peach’]
6.3.3 利用输入填充字典
cilent = {}
while True:
name = input("Please input your name:")
nick_name = input("Please input your nickname:")
cilent[nick_name] = name
re = input("Would you like to continue? (yes/no)")
if re == 'no':
break
print(cilent)
