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< li class = "toctree-l1 has-children" > < a class = "reference internal" href = "environments/atari/" > Atari< / a > < input class = "toctree-checkbox" id = "toctree-checkbox-2" name = "toctree-checkbox-2" role = "switch" type = "checkbox" / > < label for = "toctree-checkbox-2" > < div class = "visually-hidden" > Toggle child pages in navigation< / div > < i class = "icon" > < svg > < use href = "#svg-arrow-right" > < / use > < / svg > < / i > < / label > < ul >
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< li class = "toctree-l2" > < a class = "reference internal" href = "environments/atari/adventure/" > Adventure< / a > < / li >
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< section id = "gymnasium-is-a-standard-api-for-reinforcement-learning-and-a-diverse-collection-of-reference-environments" >
< h1 > Gymnasium is a standard API for reinforcement learning, and a diverse collection of reference environments< a class = "headerlink" href = "#gymnasium-is-a-standard-api-for-reinforcement-learning-and-a-diverse-collection-of-reference-environments" title = "Permalink to this heading" > #< / a > < / h1 >
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< p > < strong > Gymnasium is a maintained fork of OpenAI’ < / strong > < / p >
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< div class = "highlight-python notranslate" > < div class = "highlight" > < pre > < span > < / span > < span class = "kn" > import< / span > < span class = "nn" > gymnasium< / span > < span class = "k" > as< / span > < span class = "nn" > gym< / span >
< span class = "n" > env< / span > < span class = "o" > =< / span > < span class = "n" > gym< / span > < span class = "o" > .< / span > < span class = "n" > make< / span > < span class = "p" > (< / span > < span class = "s2" > " LunarLander-v2" < / span > < span class = "p" > ,< / span > < span class = "n" > render_mode< / span > < span class = "o" > =< / span > < span class = "s2" > " human" < / span > < span class = "p" > )< / span >
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< span class = "n" > observation< / span > < span class = "p" > ,< / span > < span class = "n" > info< / span > < span class = "o" > =< / span > < span class = "n" > env< / span > < span class = "o" > .< / span > < span class = "n" > reset< / span > < span class = "p" > (< / span > < span class = "n" > seed< / span > < span class = "o" > =< / span > < span class = "mi" > 42< / span > < span class = "p" > )< / span >
< span class = "k" > for< / span > < span class = "n" > _< / span > < span class = "ow" > in< / span > < span class = "nb" > range< / span > < span class = "p" > (< / span > < span class = "mi" > 1000< / span > < span class = "p" > ):< / span >
< span class = "n" > action< / span > < span class = "o" > =< / span > < span class = "n" > policy< / span > < span class = "p" > (< / span > < span class = "n" > observation< / span > < span class = "p" > )< / span > < span class = "c1" > # User-defined policy function< / span >
< span class = "n" > observation< / span > < span class = "p" > ,< / span > < span class = "n" > reward< / span > < span class = "p" > ,< / span > < span class = "n" > terminated< / span > < span class = "p" > ,< / span > < span class = "n" > truncated< / span > < span class = "p" > ,< / span > < span class = "n" > info< / span > < span class = "o" > =< / span > < span class = "n" > env< / span > < span class = "o" > .< / span > < span class = "n" > step< / span > < span class = "p" > (< / span > < span class = "n" > action< / span > < span class = "p" > )< / span >
< span class = "k" > if< / span > < span class = "n" > terminated< / span > < span class = "ow" > or< / span > < span class = "n" > truncated< / span > < span class = "p" > :< / span >
< span class = "n" > observation< / span > < span class = "p" > ,< / span > < span class = "n" > info< / span > < span class = "o" > =< / span > < span class = "n" > env< / span > < span class = "o" > .< / span > < span class = "n" > reset< / span > < span class = "p" > ()< / span >
< span class = "n" > env< / span > < span class = "o" > .< / span > < span class = "n" > close< / span > < span class = "p" > ()< / span >
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