How to find Future OI of a symbol for current and next month and also the delivery data?
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You have two questions -
Futures Open Interest Data -
There are two ways -
Either use the derivative_history() function as shown here NSEPy Functions - Unofficed
Or use OI Chain Builder Function shown here Basic Functions - Unofficed
**Delivery Data - **
Use Bhavcopy as shown here NSEPy Functions - Unofficed
NSEPython have everything that was in NSEPy and NSETools. It is highly unlikely you will miss anything. But if I do, point it, I will add it 
Go through the documentation