Jupyter Notebook -> Python code
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When using Jupyter Notebook
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   Click File ->
      -> Download
      -> Python (py)

When using Jupyter Lab
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   Click 'File' ->
    -> Save and Export Notebook as …
    -> Executable Script
    -> [saved in Download directory]
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Number grades to letter grades
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I plan to convert a number grade to a letter grade. The cut-off points are 90,80,70,60,
 and 50. The letter grades are A, B, C, D, E, and F (for failure). For example, if a
 grade is above or equal to 90, the student will get an A. Please write a Python function.

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toral risk 
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 In finance, we use the standard deviation of returns to measure the total 
   risk. Write a Python program to compare the risk between Walmart and IBM.

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Sharpe ratio
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 I have a data set located at http://datayyy.com/data_csv/ibmMonthly.csv. write a Python program
  to calculate its annualized standard deviation (risk), mean, and Sharpe ratio. 
  For the calculation of the Sharpe Ratio, the annual risk-free rate is 1%.

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Monthly mortgage payment
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 Write a Python function to calculate the mortgage monthly payment. For example, 
   the house price is $200,000 with a 20% down payment. The annual mortgage rate
   is 5.6% for 30 years.
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Links
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https://github.com/LouisShark/chatgpt_system_prompt

Shark, Louis,2023, chatgpt_system_prompt
   https://www.techrepublic.com/article/chatgpt-cheat-sheet/

ChatGPT Prompts For Machine Learning
   https://www.geeksforgeeks.org/top-chatgpt-prompts-for-machine-learning/

 Yan,Yuxing, 2023, Chater 2:WRITING, EXPLAINING, AND DEBUGGING CODE VIA CHATGPT 
    http://datayyy.com/mlif/chapter2chatGPT.pdf

https://github.com/phodal/understand-prompt
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