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You can retrieve the value of a data frame by referencing another data frame by using the indexing operator ([ ]) or the loc function. Here's an example:

Let's say you have two data frames:

df1:

| | name | age | |---|--------|-----| | 0 | Alice | 25 | | 1 | Bob | 30 | | 2 | Charlie| 35 |

df2:

| | index | |---|-------| | 0 | 2 | | 1 | 1 | | 2 | 0 |

To retrieve the age of a person in df1 using the index from df2, you can use the following code:

# Using indexing operator
df1["age"][df2["index"][0]]

# Using loc function
df1.loc[df2["index"][0], "age"]

Both methods will retrieve the age of the person with index 2 (Charlie), which is 35.