{"id":147680,"date":"2022-07-12T11:30:12","date_gmt":"2022-07-12T15:30:12","guid":{"rendered":"https:\/\/ibkrcampus.com\/?p=147680"},"modified":"2022-11-21T09:56:16","modified_gmt":"2022-11-21T14:56:16","slug":"how-to-import-python-classes-into-r","status":"publish","type":"post","link":"https:\/\/www.interactivebrokers.com\/campus\/ibkr-quant-news\/how-to-import-python-classes-into-r\/","title":{"rendered":"How to Import Python Classes into R"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\" id=\"h-background\"><strong>Background<\/strong><\/h2>\n\n\n\n<p>This post is going to talk about how to import&nbsp;<a href=\"https:\/\/theautomatic.net\/category\/python\/\">Python<\/a>&nbsp;classes into&nbsp;<a href=\"https:\/\/theautomatic.net\/category\/r\/\">R<\/a>, which can be done using a really awesome package in R called&nbsp;<strong>reticulate<\/strong>.&nbsp;<strong>reticulate<\/strong>&nbsp;allows you to call Python code from R, including sourcing Python scripts, using Python packages, and porting functions and classes.<\/p>\n\n\n\n<p>To install&nbsp;<strong>reticulate<\/strong>, we can run:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\t\ninstall.packages(\"reticulate\")<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Creating a Python class<\/strong><\/h2>\n\n\n\n<p>Let\u2019s create a simple class in Python.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import pandas as pd\n \n# define a python class\n \nclass explore:\n \n  def __init__(self, df):\n \n    self.df = df\n \n  def metrics(self):\n \n    desc = self.df.describe()\n \n    return desc\n \n  def dummify_vars(self):\n \n    for field in self.df.columns:\n \n        if isinstance(self.df&#91;field]&#91;0], str):\n \n          temp = pd.get_dummies(self.df&#91;field])         \n \n          self.df = pd.concat(&#91;self.df, temp], axis = 1)\n \n          self.df.drop(columns = &#91;field], inplace = True)<\/code><\/pre>\n\n\n\n<p><strong>Porting the Python class to R<\/strong><\/p>\n\n\n\n<p>There\u2019s a couple ways we can can port our Python class to R. One way is by sourcing a Python script defining the class. Let\u2019s suppose our class is defined in a script called \u201csample_class.py\u201d. We can use the&nbsp;<strong>reticulate<\/strong>&nbsp;function&nbsp;<em>source_python<\/em>.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># load reticulate package\nlibrary(reticulate)\n \n# inside R, source Python script\nsource_python(\"sample_class.py\")<\/code><\/pre>\n\n\n\n<p>Running the command above will not only make the class we defined will available to us in our R session, but would also make any other variables or functions we defined in the script available as well (if those exist). Thus, if we define 10 classes in the script, all 10 classes will be available in the R session. We can refer to any specific method defined in a class using R\u2019s \u201c$\u201d notation, rather than the \u201cdot\u201d notation of Python.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"520\" height=\"142\" data-src=\"\/campus\/wp-content\/uploads\/sites\/2\/2022\/07\/reticulate-import-python-class-into-r-the-automatic-net.jpg\" alt=\"\" class=\"wp-image-147689 lazyload\" data-srcset=\"https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2022\/07\/reticulate-import-python-class-into-r-the-automatic-net.jpg 520w, https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2022\/07\/reticulate-import-python-class-into-r-the-automatic-net-300x82.jpg 300w\" data-sizes=\"(max-width: 520px) 100vw, 520px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 520px; aspect-ratio: 520\/142;\" \/><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code>result &lt;- explore(iris)\n \n# get summary stats of data\nresult$metrics()\n \n# create dummy variables from factor \/ character fields \n# (just one in this case)\nresult$dummify_vars()<\/code><\/pre>\n\n\n\n<p>One other note is that when you import a class from Python, the class becomes a&nbsp;<a href=\"https:\/\/www.r-bloggers.com\/closures-in-r-a-useful-abstraction\/\">closure<\/a>&nbsp;in R. You can see this by running R\u2019s&nbsp;<strong>typeof<\/strong>&nbsp;function:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\t\ntypeof(explore) # closure<\/code><\/pre>\n\n\n\n<p><strong>Using R markdown to switch between R and Python<\/strong><\/p>\n\n\n\n<p>Another way of using a Python class in R is by using&nbsp;<a href=\"https:\/\/rmarkdown.rstudio.com\/\">R Markdown<\/a>. This feature is available in RStudio v. 1.2+ and it allows us to write chunks of R code followed by chunks of Python code, and vice-versa. It also lets us pass variables, or even classes from Python to R. Below, we write the same code as above, but this time using chunks in an&nbsp;<a href=\"https:\/\/rmarkdown.rstudio.com\/\">R Markdown file<\/a>. When we write switch between R and Python chunks in R Markdown, we can reference Python objects (including classes) by typing&nbsp;<strong>py$name_of_object<\/strong>, where you just need to replace&nbsp;<em>name_of_object<\/em>&nbsp;with whatever you\u2019re trying to reference from the Python code. In the below case, we reference the&nbsp;<em>explore<\/em>&nbsp;class we created by typing&nbsp;<strong>py$explore<\/strong>.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>```{r}\n \nlibrary(reticulate)\n \n```\n \n \n```{python}\n \nimport pandas as pd\n  \n# define a python class\n  \nclass explore:\n  \n  def __init__(self, df):\n  \n    self.df = df\n  \n  def metrics(self):\n  \n    desc = self.df.describe()\n  \n    return desc\n  \n  def dummify_vars(self):\n  \n    for field in self.df.columns:\n  \n        if isinstance(self.df&#91;field]&#91;0], str):\n  \n          temp = pd.get_dummies(self.df&#91;field])         \n  \n          self.df = pd.concat(&#91;self.df, temp], axis = 1)\n  \n          self.df.drop(columns = &#91;field], inplace = True)\n \n```\n \n```{r}\n \npy$explore\n \n```<\/code><\/pre>\n\n\n\n<p><strong>Example with class and instance variables<\/strong><\/p>\n\n\n\n<p>Now, let\u2019s look at another example. Below, we create a Python class in a file called \u201csample_class2.py\u201d that has an instance variable (value) and a class variable (num).<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class test:\n \n    def __init__(self, value):\n        self.value = value\n         \n    def class_var(self):\n        test.num = 10<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>source_python(\"sample_class2.py\")\n \ncheck = test(5)\n \ncheck$value\n \ncheck$num # error because class_var hasn't been called yet\n \ncheck$class_var()\n \ncheck$num # works now\n \ntest$num\n<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"640\" height=\"250\" data-src=\"\/campus\/wp-content\/uploads\/sites\/2\/2022\/07\/reticulate-class-variable-the-automatic-net.jpg\" alt=\"\" class=\"wp-image-147694 lazyload\" data-srcset=\"https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2022\/07\/reticulate-class-variable-the-automatic-net.jpg 640w, https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2022\/07\/reticulate-class-variable-the-automatic-net-300x117.jpg 300w\" data-sizes=\"(max-width: 640px) 100vw, 640px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 640px; aspect-ratio: 640\/250;\" \/><\/figure>\n\n\n\n<p>That\u2019s it for now! If you enjoyed this post,&nbsp;<a href=\"https:\/\/twitter.com\/AutomaticSource\">please follow my blog on Twitter<\/a>.<\/p>\n\n\n\n<p>To learn more about&nbsp;<strong>reticulate<\/strong>,&nbsp;<a href=\"https:\/\/rstudio.github.io\/reticulate\/\">check out its official documentation here<\/a>.<\/p>\n\n\n\n<p><em>Visit TheAutomatic.net to learn more about this topic <a href=\"https:\/\/theautomatic.net\/2020\/01\/14\/how-to-import-python-classes-into-r\/\">https:\/\/theautomatic.net\/2020\/01\/14\/how-to-import-python-classes-into-r\/<\/a>.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This post is going to talk about how to import\u00a0Python\u00a0classes into\u00a0R, which can be done using a really awesome package in R called\u00a0reticulate.\u00a0reticulate\u00a0allows you to call Python code from R, including sourcing Python scripts, using Python packages, and porting functions and classes.<\/p>\n","protected":false},"author":388,"featured_media":67841,"comment_status":"closed","ping_status":"open","sticky":true,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[339,343,349,338,341,352,344,342],"tags":[806,595,487,12269,10024,6591],"contributors-categories":[13695],"class_list":{"0":"post-147680","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-data-science","8":"category-programing-languages","9":"category-python-development","10":"category-ibkr-quant-news","11":"category-quant-development","12":"category-quant-north-america","13":"category-quant-regions","14":"category-r-development","15":"tag-data-science","16":"tag-python","17":"tag-r","18":"tag-r-markdown","19":"tag-reticulate-package","20":"tag-rstats","21":"contributors-categories-theautomatic-net"},"pp_statuses_selecting_workflow":false,"pp_workflow_action":"current","pp_status_selection":"publish","acf":[],"yoast_head":"<!-- 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