Reading from a CSV using two programs simultaneously

Question

Good day. I am wondering if there is any way in which one can allow different programming languages to access a csv at the same time, I am using c# to get live stock market data, and then Python does calculations on this data where it then returns the data to the csv file to be read by c# again. it works if I use multiple steps ie, collect historical data predict the historical data and read the historical data. but when I try to do this in one step(live) I get the following error.

[Errno 13] Permission denied: 'CurrencyPair-Minute.csv'

I think this is the result of the file being used by the c# program. Which I opened with the following parameters

File.Open(fiName, FileMode.Open, FileAccess.ReadWrite, FileShare.Write);

I only close the data streams when the program stops and to the streams are continually open for reading and writing in the c# program. If I close the stream while the file is not being read or written the error I get is

Crashed in (MethodName) with ArgumentException: Stream was not readable.

Also, this will not work since the Python program continually needs to check the file for updates.

Any help would be appreciated

Thank you

Answer 1

You should be able to run the python script from your C# file after fetching the data and writing to the csv and closing the csv file in C#. See here: How do I run a Python script from C#? .

The flow would be something like this:

C#

• Fetch data
• Write to csv
• Close file
• Call python script

Python

• Do calculation
• Write to file
• Close file
• Exit