How to use pandas to select certain columns in csv file

问题

I only just started my coding journey in order to and have watched a bunch of tutorials on youtube and am now trying to 'import' a dataset from SPSS into python using jupyter.

So far I've managed to convert the .sav into a .csv file and read it using the code below. I want to select certain columns in my data and store them in a new csv file in order to do some analysis on them and try to build a script to predict certain things and characteristics. Problem is i have hundreds of data columns and only want 3 or 4 to start with.

i tried using the data.drop() function but soon realized there must be a better way to do this?

I apologize in advance for my inability to explain this in a better way as this is my very first post here.

import pandas as pd
df = pd.read_csv('csvfile.csv')
df

回答1:

Use this:

import pandas as pd
df = pd.read_csv('csvfile.csv' , usecols = ['col1','col2'])
df

Inplace of 'col1' and 'col2' enter the column names. Then to write them into another csv , do this:

df.to_csv('csv_file_1.csv' , index = False)

回答2:

You can select columns by their names.

import pandas as pd 
df = pd.read_csv('csvfile.csv')
final_df = df[['col1','col2','col3']]

or you can select them by indexes

final_df = df.iloc[:,[0,1,2]]

来源：https://stackoverflow.com/questions/56888607/how-to-use-pandas-to-select-certain-columns-in-csv-file