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如何检查多少行以数字开头(How to check how many line start with digit)

 假设一个字符串“ text ”代表多行，我怎么才能算出一个数字开头的行数？  
def digit_leading_lines(text):
    n = 0
    newlist = text.split()
    for i in range (len(newlist)):
        for j in range (len(newlist[i])):
            if newlist[i][j].isdigit() == True:
                n += 1
    return n 
 
 一旦我用text =' AAA\n1st '测试它，它会给出正确的输出为1.但是当我输入text =“ \t4G\nHz\n ”时，它会导致第一行以tab开头，输出应该是0但是，它仍然给我1作为输出。  
 而当我测试“ 0\n0 3\n\n ”时，它给了我错误的输出3.感谢您的帮助。 

Assume a string 'text' represents multiple lines, how do I count that how many lines starts with a digit? 
def digit_leading_lines(text):
    n = 0
    newlist = text.split()
    for i in range (len(newlist)):
        for j in range (len(newlist[i])):
            if newlist[i][j].isdigit() == True:
                n += 1
    return n 
 
Once I test it with text = 'AAA\n1st', it gives the right output as 1. But when I input text = "\t4G\nHz\n", which cause the first line start with tab, and output should be 0. However, it still gives me 1 as output.  
And when I test for "0\n0 3\n\n" it gives me wrong output 3. Thanks for any help. 

原文：https://stackoverflow.com/questions/36114324

更新时间：2020-01-18 19:24

最满意答案

 Collections框架有更多好处 - 除非你真的需要使用它们，否则通常应该避免使用它们。 不过，既然您已经要求使用数组，那么您可以使用Collections为您完成繁重的工作。  
 要创建两个大小相同的团队，请从组中随机选择团队成员：  
Player[] online = getServer().getOnlinePlayers(); // don't need to code "this."
List<Player> list = Arrays.asList(online);
Collections.shuffle(list);
Player[] team1 = list.subList(0, list.size() / 2).toArray(online);
Player[] team2 = list.subList(list.size() / 2, list.size()).toArray(online);
 
 此代码可满足该组中奇数个玩家的需求。  
 如果你正在使用集合（一个集合将是正确的集合使用）而不是数组，那么任务就会简单得多。 

The Collections framework has more goodies - you should in general avoid arrays unless you really need to use them. Nevertheless, since you have asked for arrays, here's how you can use Collections to do the heavy lifting for you. 
To create two teams of equal size, selecting team members randomly from a group: 
Player[] online = getServer().getOnlinePlayers(); // don't need to code "this."
List<Player> list = Arrays.asList(online);
Collections.shuffle(list);
Player[] team1 = list.subList(0, list.size() / 2).toArray(online);
Player[] team2 = list.subList(list.size() / 2, list.size()).toArray(online);
 
This code cater for an odd number of players in the group. 
If you were working with Collections (a Set would be the right Collection to use) and not arrays, the task would be far simpler.

如何检查多少行以数字开头(How to check how many line start with digit)

最满意答案

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