I am having a doubt that though creating a subset of dataframe just creates a view of dataframe then why it didnt change value in original dataframe?

Data Analysis with Python: Zero to Pandas Lecture 4 - Analyzing Tabular Data with Pandas
#1

doubt
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#2

It is just a warning that chained-indexing is detected . So try to use .loc method to reassign a value this could change the value in original DataFrame also. If I am wrong try to correct me.