using python use the following dataset: df_vra = pd.read_csv('externos.csv', sep=';') and loop through each row and get the value of the columns RUT, DV, and Names
You shouldn't use a for loop in this instance. Pandas has a built in method to get a subset of the columns in a dataframe. You give a list of the column names you want as an index like so:

columns = [ RUT, DV, Names]
df_vra[columns]

Should return what you want.
Interesting. Why did you assume I use pandas? I mean you are not wrong, but I am still wondering.
Pandas is commonly imported as such: import pandas as pd. Pandas provides the read_csv method in order to read a comma-separated values file into DataFrame. Thus, I concluded that your instruction df_vra = pd.read_csv('externos.csv', sep=';') implies that you are using the Pandas library.