比较数字会在Python中产生错误的结果 [英] Comparing numbers give the wrong result in Python
问题描述
如果我输入任何小于24的值,它会打印出你将老了......的声明。如果我输入任何大于24的值(最多99个),它会打印你老了的声明。
问题是如果输入值100或者更大,它打印出在你知道它之前你会老去。声明。
print('你的名字是什么?')
myName = input()
print ('你好,'+ myName)
打印('你多大了?,'+ myName)
myAge = input()
如果myAge> ('24'):
打印('你老了,'+ myName)
else:
print('你知道之前你会老了。')
您正在测试字符串值 myAge
对另一个字符串值 '24'
,而不是整数值。
如果myAge> ('24'):
打印('你老了,'+ myName)
应该是
如果int(myAge)> 24:
打印('你老了,{}'。格式(myName))
在Python中,你可以比字符串更大/更小,但它不会像你想象的那样工作。因此,如果要测试字符串的整数表示的值,请使用 int(the_string)
>>> 2> 1
True
>>> 02> 1
False
>>> int(02)> int(1)
True
你可能也注意到我改变了 print('你老了,'+ myName)
到 print('你老了,{}'。format(myName))
- 您应该习惯这种字符串格式,而不是使用 +
进行字符串连接 - 您可以在文档。但它确实与你的核心问题没有任何关系。
sorry if this is a terrible question, but I am really new to programming. I am attempting a short little test program.
If I enter any value less than 24, it does print the "You will be old..." statement. If I enter any value greater than 24 (ONLY up to 99), it prints the "you are old" statement.
The problem is if you enter a value of 100 or greater, it prints the "You will be old before you know it." statement.
print ('What is your name?')
myName = input ()
print ('Hello, ' + myName)
print ('How old are you?, ' + myName)
myAge = input ()
if myAge > ('24'):
print('You are old, ' + myName)
else:
print('You will be old before you know it.')
You're testing a string value myAge
against another string value '24'
, as opposed to integer values.
if myAge > ('24'):
print('You are old, ' + myName)
Should be
if int(myAge) > 24:
print('You are old, {}'.format(myName))
In Python, you can greater-than / less-than against strings, but it doesn't work how you might think. So if you want to test the value of the integer representation of the string, use int(the_string)
>>> "2" > "1"
True
>>> "02" > "1"
False
>>> int("02") > int("1")
True
You may have also noticed that I changed print('You are old, ' + myName)
to print('You are old, {}'.format(myName))
-- You should become accustomed to this style of string formatting, as opposed to doing string concatenation with +
-- You can read more about it in the docs. But it really doesn't have anything to do with your core problem.
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