Python 学习笔记(六)
Aug 26, 2016
有时候,
input()
中的提示可能超过一行,在这种情况下,可将提示存储在一个变量中,再将该变量传递给函数input()
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10prompt = "If you tell us who you are, we can personalize the message you see."
prompt += "\nWhat is your first name? "
name = input(prompt)
print("\nHello, " + name + "!")
# If you tell us who you are, we can personalize the message you see.
# What is your first name? Eirc
#
# Hello, Eirc!
input()
得到的是用户输入数值的字符串表示,可用int()
获取真正的数值输入:1
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5age = input("How old are you: ")
print(type(age))
# How old are you: 21
# <class 'str'>1
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11height = input("How tall are you, in inches? ")
height = int(height)
if height > 36:
print("\nYou're tall enough to ride!")
else:
print("\nYou'll be able to ride when you're a little older.")
# How tall are you, in inches? 71
#
# You're tall enough to ride!将数值输入用于计算和比较前,务必将其转换为数值表示。
在 Python 2.7 中获取输入应使用函数
raw_input()
,这个函数也将输入解读为字符串,Python 2.7 中也包含函数input()
,但它将用户输入解读为 Python 代码,并尝试运行它们。在复杂的程序中,如果有很多事件都会导致程序停止运行,标志很有用:
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14prompt = "\nTell me something, and I will repeat it back to you:"
prompt += "\nEnter 'quit' to end the program. "
active = True # 设置标志
while active:
message = input(prompt)
# 有两个让程序结束的事件
if message == 'quit':
active = False
elif message == 'exit':
active = False
else:
print(message)