Merge pull request #111103 from Bowen-Guo/bowguo/execute_python_script

Update doc of Module Execuete Python Script to reduce user error

Author: PRMerger20

articles/machine-learning/algorithm-module-reference/execute-python-script.md

@@ -159,7 +159,7 @@ The following example shows how to upload an image file in the **Execute Python
 # imports up here can be used to
 import pandas as pd
 
-# The entry point function can contain up to two input arguments:
+# The entry point function must have two input arguments:
 #   Param<dataframe1>: a pandas.DataFrame
 #   Param<dataframe2>: a pandas.DataFrame
 def azureml_main(dataframe1 = None, dataframe2 = None):
@@ -212,10 +212,17 @@ The **Execute Python Script** module contains sample Python code that you can us
 
 5. In the **Python script** text box, type or paste valid Python script.
 
+    > [!NOTE]
+    > Please be very careful when writing your script and make sure there is no syntax error, such as using a un-declared object or a un-imported module. Also pay extra attentions to the pre-installed module list. To import modules which are not listed, install the corresponding packages in your script such as
+	>  ``` Python
+	> import os
+	> os.system(f"pip install scikit-misc")
+	> ```
+    
     The **Python script** text box is pre-populated with some instructions in comments, and sample code for data access and output. You must edit or replace this code. Be sure to follow Python conventions about indentation and casing.
 
     + The script must contain a function named `azureml_main` as the entry point for this module.
-    + The entry point function can contain up to two input arguments: `Param<dataframe1>` and `Param<dataframe2>`
+    + The entry point function must have two input arguments: `Param<dataframe1>` and `Param<dataframe2>`, even when these arguments are not used in your script.
     + Zipped files connected to the third input port are unzipped and stored in the directory, `.\Script Bundle`, which is also added to the Python `sys.path`. 
 
     Therefore, if your zip file contains `mymodule.py`, import it using `import mymodule`.