Java代码:
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class RegExpTest {
public static void main(String[] args) {
String str = "X-Value = -0.525108, Y-Value = 7.746691, Z-Value = 5.863008, Timestamp(milliseconds) = 23001";
String p = "Value = (.*?), ";
Pattern pattern = Pattern.compile(p);
Matcher matcher = pattern.matcher(str);
if (matcher.find()){
System.out.println(matcher.group(1));
System.out.println(matcher.group(2));
System.out.println(matcher.group(3));
}
}
}
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Java代码的输出:
$ java RegExpTest
-0.525108
Exception in thread "main" java.lang.IndexOutOfBoundsException: No group 2
at java.util.regex.Matcher.group(Matcher.java:487)
at RegExpTest.main(RegExpTest.java:15)
$
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Python代码(在Interpreter中):
>>> import re
>>> re.findall("Value = (.*?), ", …
Run Code Online (Sandbox Code Playgroud) 我有一个变量:
x = 4
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我有一个清单:
list = [{'name': u'A', 'value': '1'}, {'name': u'B', 'value': '4'}, {'name': u'C', 'value': '2'}]
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如何排除/删除列表中value = x的元素?
我是Java中的菜鸟,是在python之后学习Java的人.无论如何,我很难搞清楚这一点.假设我有班级
class Bicycle{
....
}
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和
public class Bicycle{
....}
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有什么不同.那怎么样?
public static class Bicycle{
// if this can be a valid class def in first place
}
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然后,在此之后..让我们谈谈变量.
class Bicycle{
int Gear or public int Gear // whats the difference
}
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什么时候使用哪一个?
所以我试图在python的列表中找到一个项目.这是我的功能:
def operator(input):
operatorlist = ['+', '-', '*', '/', '^', 'sin', 'cos']
for i in operatorlist:
if input is operatorlist[i]:
return True
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我的代码破了,我无法弄清楚为什么......任何想法?
我改变了我的代码:
def operator(input):
if input is '+' or input is '-' or input is '*' or input is '/' or input is '^' or input is 'sin' or input is 'cos':
return True
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因为我被告知,基本上,风格上是愚蠢的,以这种方式写它.
码:
def Division():
print "************************\n""********DIVISION********\n""************************"
counter = 0
import random
x = random.randint(1,10)
y = random.randint(1,10)
answer = x/y
print "What will be the result of " + str(x) + '/' + str(y) + " ?"
print "\n"
userAnswer = input ("Enter result: ")
if userAnswer == answer:
print ("Well done!")
print "\n"
userInput = raw_input ("Do you want to continue? \n Enter 'y' for yes or 'n' for no.")
if userInput == "y":
print "\n"
Division()
else:
print "\n" …
Run Code Online (Sandbox Code Playgroud) 循环完成后如何计算胜利.
print 'PLAY ROCK PAPER SCISSORS'
for roundd in range(1,6):
print 'Round: ' + str(roundd)
human = raw_input('Whats your draw: ')
from random import choice
cpu = choice(('rock', 'paper', 'scissors'))
if human == cpu:
print 'CPU: ' + cpu
print 'Draw'
if cpu == 'rock' and human == 'scissors':
print 'CPU: ' + cpu
print 'You Lose'
if cpu == 'scissors'and human == 'paper':
print 'CPU: ' + cpu
print 'You Lose'
if cpu == 'paper'and human == 'rock':
print …
Run Code Online (Sandbox Code Playgroud) 假设我有一个字符串,/Apath1/Bpath2/Cpath3/0-1-2-3-4-5-something.otherthing
我只想提取'0-1-2-3-4-5'部分.我试过这个:
str='/Apath1/Bpath2/Cpath3/0-1-2-3-4-5-something.otherhing'
print str[str.find("-")-1:str.find("-")]
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但是,结果只有0.如何提取'0-1-2-3-4-5'部分?
这是我的Django模型
class author(models.Model):
name = models.CharField('name',max_length=140)
datamode = models.CharField(max_length=1, default='A', choices=DATAMODE_CHOICE)
def __str__(self):
return '%s' % (self.name)
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虽然我author
在另一个类中使用此类作为外键,如下所示:
class books(models.Model):
NEW_FLAG=(('N','New'),('O','Old'))
name = models.CharField('name',max_length=140)
author = models.ForeignKey(author, blank=True, null=True)
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当我在管理员中输入新书详细信息时,它显示:
IntegrityError: Column 'author_id' cannot be null.
Run Code Online (Sandbox Code Playgroud) 我是Python的新手,想根据几何分布生成一些数字.我发现这个代码在互联网上但不起作用:
import random
from math import ceil, log
def geometric(p):
# p should be in (0.0, 1.0].
if ((p <= 0.0) or (p >=1.0)):
raise ValueError("p must be in the interval (0.0, 1.0]")
elif p == 1.0:
# If p is exactly 1.0, then the only possible generated value is 1.
# Recognizing this case early means that we can avoid a log(0.0) later.
# The exact floating point comparison should be fine. log(eps) works just
# dandy.
return 1 …
Run Code Online (Sandbox Code Playgroud) 我需要建议.我正在写一个计算器; 我已经掌握了它的基本功能,并最终转向使用它的处理功能.在这方面,我发现Python提供的标准数学函数库不令人满意.
虽然定义了更常用的函数,但一些较为模糊的函数缺乏适当的提及.这方面的例子包括弧双曲余切,弧双曲余割,双曲余割,割线等.虽然其中一些只是对所提供功能的操纵,但似乎更好的选择是提供我们的定义并将程序引用到它遇到了他们.
这是我的问题所在.我应该在主脚本中定义这些函数,还是应该使用单独的文件?如果我是后者,我该如何引用单独的文件?我对Python比较陌生,所以如果我缺少常用技术或其他东西,请告诉我.提前致谢.
任何人都可以指导我在线文档或书籍,我可以在其中找到并了解C语言中的Python实现,例如Perl的 这个:http://perldoc.perl.org/index-internals.html或本书:扩展和Simon Cozen嵌入Perl.
#<link rel='canonical' href='http://www.samplewebsite.com/image/5434553/' />
#I am trying to grab the text in href
image = str(Soup)
image_re = re.compile('\<link rel=\'cononical\' href=')
image_pat = re.findall(image_re, image)
print image_pa
#>> []
#Thanks!
Run Code Online (Sandbox Code Playgroud) 如何将PHP多维数组转换为Python字典格式的字符串?
var_dump($myarray);
array(2) { ["a1"]=> array(2) { ["29b"]=> string(0) "" ["29a"]=> string(0) "" } ["a2"]=> array(2) { ["29b"]=> string(0) "" ["29a"]=> string(0) "" } }
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