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Editorial Team
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Asked: 2026-05-15T10:48:05+00:00

In python after imports, one can see the file, that has been loaded/where the

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In python after imports, one can see the file, that has been loaded/where the module comes from.

>>> import os
>>> os.__file__
'/Users/tm/lib/python2.6/os.pyc'

What would be the equivalent in ruby?

>> require 'xmlrpc/client'
=> true
>> ...
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1 Answer

  1. Editorial Team

    There’s nothing exactly equivalent.

    All files that have been required are listed in $LOADED_FEATURES in the order they were required. So, if you want to know where a file came from directly after it was required, you simply need to look at the end:

    $LOADED_FEATURES.last if require 'yaml'
# => 'C:/Program Files/Ruby/lib/ruby/1.9.1/yaml.rb'

    However, unless you record every call to require it’s going to be hard to figure out which entry corresponds to which call. Also, if a file is already in $LOADED_FEATURES, it will not get loaded again:

    require 'yaml'
# => true
# true means: the file was loaded

$LOADED_FEATURES.last
# => 'C:/Program Files/Ruby/lib/ruby/1.9.1/yaml.rb'

require 'json'
$LOADED_FEATURES.last
# => 'C:/Program Files/Ruby/lib/ruby/1.9.1/json.rb'

require 'yaml'
# => false
# false means: the file wasn't loaded again, because it has already been loaded

$LOADED_FEATURES.last
# => 'C:/Program Files/Ruby/lib/ruby/1.9.1/json.rb'
# Last loaded feature is still JSON, because YAML wasn't actually loaded twice

    Also, many libraries aren’t contained in a single file. So, the required files might themselves contain calls to require. In my case, for example, require 'yaml' not only loads yaml.rb but a whole bunch of files (15 to be exact):

    1. C:/Program Files/Ruby/lib/ruby/1.9.1/i386-mingw32/stringio.so
    2. C:/Program Files/Ruby/lib/ruby/1.9.1/i386-mingw32/syck.so
    3. C:/Program Files/Ruby/lib/ruby/1.9.1/syck/error.rb
    4. C:/Program Files/Ruby/lib/ruby/1.9.1/syck/basenode.rb
    5. C:/Program Files/Ruby/lib/ruby/1.9.1/syck/syck.rb
    6. C:/Program Files/Ruby/lib/ruby/1.9.1/syck/tag.rb
    7. C:/Program Files/Ruby/lib/ruby/1.9.1/syck/stream.rb
    8. C:/Program Files/Ruby/lib/ruby/1.9.1/syck/constants.rb
    9. C:/Program Files/Ruby/lib/ruby/1.9.1/date/format.rb
    10. C:/Program Files/Ruby/lib/ruby/1.9.1/date.rb
    11. C:/Program Files/Ruby/lib/ruby/1.9.1/syck/rubytypes.rb
    12. C:/Program Files/Ruby/lib/ruby/1.9.1/syck/types.rb
    13. C:/Program Files/Ruby/lib/ruby/1.9.1/yaml/syck.rb
    14. C:/Program Files/Ruby/lib/ruby/1.9.1/syck.rb
    15. C:/Program Files/Ruby/lib/ruby/1.9.1/yaml.rb
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