L = [95.5, 85, 59]
print L[-1]
print L[-2]
print L[-3]
printL = [95.5, 85, 59]
print L[-1]
print L[-2]
print L[-3]
print L[-4]
只有三个元素已经越界了，为什么 L[-4]也没有报错呢
print L[-1]
print L[-2]
print L[-3]
printL = [95.5, 85, 59]
print L[-1]
print L[-2]
print L[-3]
print L[-4]
只有三个元素已经越界了，为什么 L[-4]也没有报错呢
2016-05-22
L = [95.5,85,59] print L[0] print L[1] print L[2] print L[3] 参考答案不对呢，第四名的分数L[3]改为L[-1]才正确，这是什么原因呢
2016-05-22
已采纳回答 / qq_爱的前奏哼哼_0
我觉得不用在意吧，可以在自己的电脑上运行试试，能通过就行了。这个网站有时候提交时候感觉有问题，我在进行下面的练习时就出现过一个问题，网站上怎么都提示有错误，在自己电脑上运行.py文件是可以打印输出的。就行了。# -*- coding: utf-8 -*-print u'''静夜思床前明月光，疑是地上霜。举头望明月，低头思故乡。'''
2016-05-22
最新回答 / RicoYou
廖老师自己网站上 有这么一个步骤 代码运行助手http://www.liaoxuefeng.com/wiki/0014316089557264a6b348958f449949df42a6d3a2e542c000/001432523496782e0946b0f454549c0888d05959b99860f000
2016-05-22
L = [75, 92, 59, 68]
sum = L[0] + L[1] + L[2] + L[3] + 0.0
print sum / 4
哈哈 出来73.5就是对的 哈哈
sum = L[0] + L[1] + L[2] + L[3] + 0.0
print sum / 4
哈哈 出来73.5就是对的 哈哈
2016-05-22
age = 18
if age >= 6 and age < 18:
print 'teenager'
elif age >= 18:
print 'adult'
else:
print 'kid'
if age >= 6 and age < 18:
print 'teenager'
elif age >= 18:
print 'adult'
else:
print 'kid'
2016-05-22
sum = 0
x = 1
while x<100:
if x%2==0:
sum+=x
x=x+1
print(sum)
x = 1
while x<100:
if x%2==0:
sum+=x
x=x+1
print(sum)
2016-05-21
最新回答 / 丶岸上的风景
t[2]指向一个 list （实际上是一个内存地址）L=t[2] 是将 L 指向该listL[0]='X' 是将该list的0位的内存地址里面的数据替换为X ，而不是开辟新的位置L[1]同理
2016-05-21
def square_of_sum(L):
sum = 0
for i in L:
sum+=i**2
return sum
print square_of_sum([1, 2, 3, 4, 5])
print square_of_sum([-5, 0, 5, 15, 25])
sum = 0
for i in L:
sum+=i**2
return sum
print square_of_sum([1, 2, 3, 4, 5])
print square_of_sum([-5, 0, 5, 15, 25])
2016-05-21
print r''' '"To be ,or not to be":that is the question.
Whether it's nobler in the mind to suffer.' '''
这个在外面的win7环境下Python就能运行出来，为嘛在这儿还是不行？？？
Whether it's nobler in the mind to suffer.' '''
这个在外面的win7环境下Python就能运行出来，为嘛在这儿还是不行？？？
2016-05-21
<script>alert(vulnerable)</script>
%3Cscript%3Ealert('XSS')%3C/script%3E
<script>alert('XSS')</script>
<img src="javascript:alert('XSS')">
%0a%0a<script>alert(\"Vulnerable\")</script>.jsp
%22%3cscript%3ealert(%22xss%22)%3c/script%3e
%2e%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/etc/passwd
%3Cscript%3Ealert('XSS')%3C/script%3E
<script>alert('XSS')</script>
<img src="javascript:alert('XSS')">
%0a%0a<script>alert(\"Vulnerable\")</script>.jsp
%22%3cscript%3ealert(%22xss%22)%3c/script%3e
%2e%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/etc/passwd
2016-05-21
'><script>alert(document.cookie)</script>
='><script>alert(document.cookie)</script>
<script>alert(document.cookie)</script>
='><script>alert(document.cookie)</script>
<script>alert(document.cookie)</script>
2016-05-21
s = '''Python was started in 1989 by \"Guido\".\nPython is free and easy to learn.'''
print s
print s
2016-05-21