将数据文件读入数组的正确方法 | 将数据文件读入数组的正确方法

本文介绍了将数据文件读入数组的正确方法的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有一个数据文件，每一行都有一个数字，比如

I have a data file, with each line having one number, like

如何读取此文件并将数据存储到数组中?

How do I read this file and store the data into an array?

这样我就可以对这个数组进行一些操作了.

So that I can conduct some operations on this array.

推荐答案

只需将文件读入数组，每个元素一行，很简单:

Just reading the file into an array, one line per element, is trivial:

open my $handle, '<', $path_to_file;
chomp(my @lines = <$handle>);
close $handle;

现在文件的行在数组 @lines 中.

Now the lines of the file are in the array @lines.

如果您想确保对 open 和 close 进行错误处理，请执行以下操作(在下面的剪辑中，我们以 UTF-8 模式打开文件，也是):

If you want to make sure there is error handling for open and close, do something like this (in the snipped below, we open the file in UTF-8 mode, too):

my $handle;
unless (open $handle, "<:encoding(utf8)", $path_to_file) {
   print STDERR "Could not open file '$path_to_file': $!\n";
   # we return 'undefined', we could also 'die' or 'croak'
   return undef
}
chomp(my @lines = <$handle>);
unless (close $handle) {
   # what does it mean if close yields an error and you are just reading?
   print STDERR "Don't care error while closing '$path_to_file': $!\n";
}

这篇关于将数据文件读入数组的正确方法的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！