倾倒风格

有时 Data::Dumper 还不够。有你要检查的驼鹿物体?大量相同的结构?想要的东西分类?有色? Data::Printer 是你的朋友。

use Data::Printer;

p $data_structure;

StackOverflow 文档

Data::Printer 写入 STDERR,如 warn。这样可以更容易地找到输出。默认情况下,它会对哈希键进行排序并查看对象。

use Data::Printer;
use LWP::UserAgent;

my $ua = LWP::UserAgent->new;
p $ua;

它将查看对象的所有方法,并列出内部。

LWP::UserAgent  {
    Parents       LWP::MemberMixin
    public methods (45) : add_handler, agent, clone, conn_cache, cookie_jar, credentials, default_header, default_headers, delete, env_proxy, from, get, get_basic_credentials, get_my_handler, handlers, head, is_online, is_protocol_supported, local_address, max_redirect, max_size, mirror, new, no_proxy, parse_head, post, prepare_request, progress, protocols_allowed, protocols_forbidden, proxy, put, redirect_ok, remove_handler, request, requests_redirectable, run_handlers, send_request, set_my_handler, show_progress, simple_request, ssl_opts, timeout, use_alarm, use_eval
    private methods (4) : _agent, _need_proxy, _new_response, _process_colonic_headers
    internals: {
        def_headers             HTTP::Headers,
        handlers                {
            response_header   HTTP::Config
        },
        local_address           undef,
        max_redirect            7,
        max_size                undef,
        no_proxy                [],
        protocols_allowed       undef,
        protocols_forbidden     undef,
        proxy                   {},
        requests_redirectable   [
            [0] "GET",
            [1] "HEAD"
        ],
        show_progress           undef,
        ssl_opts                {
            verify_hostname   1
        },
        timeout                 180,
        use_eval                1
    }
}

你可以进一步配置它,因此它以某种方式序列化某些对象,或包含任意深度的对象。完整配置可在文档中找到

不幸的是,Data::Printer 不附带 Perl,因此你需要从 CPAN 或通过包管理系统安装它