Add pd2org example.

test_pd2org.org

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+#+AUTHOR: Altynbek Isabekov
+#+EMAIL: aisabekov@ku.edu.tr
+#+LANGUAGE: en
+#+PROPERTY: header-args:emacs-lisp :results silent
+#+OPTIONS: ^:nil
+#+OPTIONS: html-style:nil
+#+HTML_HEAD: <link rel="stylesheet" type="text/css" href="src/readtheorg_theme/css/htmlize.css"/>
+#+HTML_HEAD: <link rel="stylesheet" type="text/css" href="src/readtheorg_theme/css/readtheorg.css"/>
+#+HTML_HEAD: <script type="text/javascript" src="src/lib/js/jquery.min.js"></script>
+#+HTML_HEAD: <script type="text/javascript" src="src/lib/js/bootstrap.min.js"></script>
+#+HTML_HEAD: <script type="text/javascript" src="src/lib/js/jquery.stickytableheaders.min.js"></script>
+#+HTML_HEAD: <script type="text/javascript" src="src/readtheorg_theme/js/readtheorg.js"></script>
+* To convert Pandas dataframe to tabular format using tabulate()
+#+header: :prologue from tabulate import tabulate
+#+header: :noweb strip-export
+#+begin_src python :results output raw
+  import pandas as pd
+  df = pd.DataFrame({
+      "a": [1,2,3],
+      "b": [4,5,6]
+  })
+  df_str = tabulate(df, headers=df.columns, tablefmt="orgtbl", showindex=False)
+  print(df_str)
+#+end_src
+
+#+RESULTS:
+| a | b |
+|---+---|
+| 1 | 4 |
+| 2 | 5 |
+| 3 | 6 |
+
+* To convert Pandas dataframe to tabular format using pd2org()
+#+name: pd2org
+#+begin_src python :var df="df" :exports none :results value raw
+  return f"return tabulate({df}, headers={df}.columns, tablefmt='orgtbl', showindex=False)"
+#+end_src
+
+#+header: :prologue from tabulate import tabulate
+#+header: :noweb strip-export
+#+begin_src python :results value raw
+  import pandas as pd
+  df = pd.DataFrame({
+      "a": [1,2,3],
+      "b": [4,5,6]
+  })
+  <<pd2org("df")>>
+  df.show()
+#+end_src
+
+#+RESULTS:
+| a | b |
+|---+---|
+| 1 | 4 |
+| 2 | 5 |
+| 3 | 6 |
+
+* To convert PySpark dataframe to tabular format using ps2org()
+#+name: ps2org
+#+header: :noweb strip-export
+#+begin_src python :var df_in="df_in" :exports none :results value raw
+  return f"return {df_in}.toPandas().to_markdown(index=False, tablefmt='orgtbl')"
+#+end_src
+
+#+header: :prologue from tabulate import tabulate
+#+header: :noweb strip-export
+#+BEGIN_SRC python :var df="df" :results value raw
+  import pyspark.sql.functions as F
+  import pyspark.sql.types as T
+  from pyspark.sql.window import Window
+  from pyspark.sql import SparkSession
+  spark = SparkSession.builder.master("local").appName("test-app").getOrCreate()
+  schema = T.StructType(
+      [
+          T.StructField("a", T.IntegerType(), True),
+          T.StructField("b", T.IntegerType(), True),
+      ]
+  )
+  data = [(1, 4), (2, 5), (3, 6)]
+  df = spark.createDataFrame(schema=schema, data=data)
+  <<ps2org("df")>>
+  df.show()
+#+END_SRC
+
+#+RESULTS:
+| a | b |
+|---+---|
+| 1 | 4 |
+| 2 | 5 |
+| 3 | 6 |