从 csv 中提取列中的数据，保存为字典（Python、Pandas）

Question

I'm learning AI and machine learning, and I found a difficulty. My CSV dataset has two important columns which are dictionary themselves, eg one of them is categories which presents the info in each row like this {"id":252,"name":"Graphic Novels"...} , I'd like to explode this data so it shows in individual columns, for example cat_id, cat_name... so I can apply filters later.

I guess there are some options in Python and Pandas but I can't see it right now. I'll appreciate your guidance.

Edit: I took the first ten rows in Excel , copied them to a new document and then opened the new csv document in notepad, copied the first ten lines in notepad and pasted them here, the document can be found in my gdrive :

backers_count,blurb,category,converted_pledged_amount,country,country_displayable_name,created_at,creator,currency,currency_symbol,currency_trailing_code,current_currency,deadline,disable_communication,friends,fx_rate,goal,id,is_backing,is_starrable,is_starred,launched_at,location,name,permissions,photo,pledged,profile,slug,source_url,spotlight,staff_pick,state,state_changed_at,static_usd_rate,urls,usd_exchange_rate,usd_pledged,usd_type
"260,""A new full-color graphic novel featuring attorneys Alanna Wolff and Jeff Byrd. This time a Grandfather ghost needs their help!"",""{""""id"""":252,""""name"""":""""Graphic Novels"""",""""analytics_name"""":""""Graphic Novels"""",""""slug"""":""""comics/graphic novels"""",""""position"""":4,""""parent_id"""":3,""""parent_name"""":""""Comics"""",""""color"""":16776056,""""urls"""":{""""web"""":{""""discover"""":""""http://www.kickstarter.com/discover/categories/comics/graphic%20novels""""}}}"",""14080"",""US"",""the United States"",""1519427735"",""{""""id"""":1379875462,""""name"""":""""Batton Lash"""",""""is_registered"""":null,""""is_email_verified"""":null,""""chosen_currency"""":null,""""is_superbacker"""":null,""""avatar"""":{""""thumb"""":""""https://ksr-ugc.imgix.net/assets/006/347/706/b3908a1a23f6b9e472edcf7c934e5b0e_original.jpg?ixlib=rb-4.0.2&w=40&h=40&fit=crop&v=1461382354&auto=format&frame=1&q=92&s=4d88bd2ed1e7098fcaf046321cc4be15"""",""""small"""":""""https://ksr-ugc.imgix.net/assets/006/347/706/b3908a1a23f6b9e472edcf7c934e5b0e_original.jpg?ixlib=rb-4.0.2&w=80&h=80&fit=crop&v=1461382354&auto=format&frame=1&q=92&s=664f586cef17d83dc408a6a10b0f3c4a"""",""""medium"""":""""https://ksr-ugc.imgix.net/assets/006/347/706/b3908a1a23f6b9e472edcf7c934e5b0e_original.jpg?ixlib=rb-4.0.2&w=160&h=160&fit=crop&v=1461382354&auto=format&frame=1&q=92&s=fe307263e32a2385e764e3923a13179e""""},""""urls"""":{""""web"""":{""""user"""":""""https://www.kickstarter.com/profile/1379875462""""},""""api"""":{""""user"""":""""https://api.kickstarter.com/v1/users/1379875462?signature=1631849432.d50b79030e15111575554ecae171babad1f2925d""""}}}"",""USD"",""$"",""true"",""USD"",""1522083186"",""false"",,""1"",""11000"",""640715060"",,""false"",,""1519494786"",""{""""id"""":2487889,""""name"""":""""San Diego"""",""""slug"""":""""san-diego-ca"""",""""short_name"""":""""San Diego, CA"""",""""displayable_name"""":""""San Diego, CA"""",""""localized_name"""":""""San Diego"""",""""country"""":""""US"""",""""state"""":""""CA"""",""""type"""":""""Town"""",""""is_root"""":false,""""expanded_country"""":""""United States"""",""""urls"""":{""""web"""":{""""discover"""":""""https://www.kickstarter.com/discover/places/san-diego-ca"""",""""location"""":""""https://www.kickstarter.com/locations/san-diego-ca""""},""""api"""":{""""nearby_projects"""":""""https://api.kickstarter.com/v1/discover?signature=1631819277.2ad6e6fd997457447d2b61e2381f4332bfad5f21&woe_id=2487889""""}}}"",""Supernatural Law: Grandfathered In"",,""{""""key"""":""""assets/020/340/272/c66a24c64ead18a0d47fcc8a4367a127_original.jpg"""",""""full"""":""""https://ksr-ugc.imgix.net/assets/020/340/272/c66a24c64ead18a0d47fcc8a4367a127_original.jpg?ixlib=rb-4.0.2&crop=faces&w=560&h=315&fit=crop&v=1519428123&auto=format&frame=1&q=92&s=76bac41cb2f43b97e6b55fdc34b1f7ca"""",""""ed"""":""""https://ksr-ugc.imgix.net/assets/020/340/272/c66a24c64ead18a0d47fcc8a4367a127_original.jpg?ixlib=rb-4.0.2&crop=faces&w=352&h=198&fit=crop&v=1519428123&auto=format&frame=1&q=92&s=96a344a45a9ef2042f27097c1dc7d04a"""",""""med"""":""""https://ksr-ugc.imgix.net/assets/020/340/272/c66a24c64ead18a0d47fcc8a4367a127_original.jpg?ixlib=rb-4.0.2&crop=faces&w=272&h=153&fit=crop&v=1519428123&auto=format&frame=1&q=92&s=0b20f77c82158c3a35c8f140cbe07591"""",""""little"""":""""https://ksr-ugc.imgix.net/assets/020/340/272/c66a24c64ead18a0d47fcc8a4367a127_original.jpg?ixlib=rb-4.0.2&crop=faces&w=208&h=117&fit=crop&v=1519428123&auto=format&frame=1&q=92&s=9217d3ad72da53831b3e6e2851cf2544"""",""""small"""":""""https://ksr-ugc.imgix.net/assets/020/340/272/c66a24c64ead18a0d47fcc8a4367a127_original.jpg?ixlib=rb-4.0.2&crop=faces&w=160&h=90&fit=crop&v=1519428123&auto=format&frame=1&q=92&s=3f44497a673dab166c74a3e4954f2ca2"""",""""thumb"""":""""https://ksr-ugc.imgix.net/assets/020/340/272/c66a24c64ead18a0d47fcc8a4367a127_original.jpg?ixlib=rb-4.0.2&crop=faces&w=48&h=27&fit=crop&v=1519428123&auto=format&frame=1&q=92&s=07d7f99494b563195c40686b7131ef43"""",""""1024x576"""":""""https://ksr-ugc.imgix.net/assets/020/340/272/c66a24c64ead18a0d47fcc8a4367a127_original.jpg?ixlib=rb-4.0.2&crop=faces&w=1024&h=576&fit=crop&v=1519428123&auto=format&frame=1&q=92&s=ae396bd768773a2e57bb8ac0563f664f"""",""""1536x864"""":""""https://ksr-ugc.imgix.net/assets/020/340/272/c66a24c64ead18a0d47fcc8a4367a127_original.jpg?ixlib=rb-4.0.2&crop=faces&w=1552&h=873&fit=crop&v=1519428123&auto=format&frame=1&q=92&s=1736aa59d62bb684684213dc5dd70241""""}"",""14080"",""{""""id"""":3318379,""""project_id"""":3318379,""""state"""":""""inactive"""",""""state_changed_at"""":1519427735,""""name"""":null,""""blurb"""":null,""""background_color"""":null,""""text_color"""":null,""""link_background_color"""":null,""""link_text_color"""":null,""""link_text"""":null,""""link_url"""":null,""""show_feature_image"""":false,""""background_image_opacity"""":0.8,""""should_show_feature_image_section"""":true,""""feature_image_attributes"""":{""""image_urls"""":{""""default"""":""""https://ksr-ugc.imgix.net/assets/020/340/272/c66a24c64ead18a0d47fcc8a4367a127_original.jpg?ixlib=rb-4.0.2&crop=faces&w=1552&h=873&fit=crop&v=1519428123&auto=format&frame=1&q=92&s=1736aa59d62bb684684213dc5dd70241"""",""""baseball_card"""":""""https://ksr-ugc.imgix.net/assets/020/340/272/c66a24c64ead18a0d47fcc8a4367a127_original.jpg?ixlib=rb-4.0.2&crop=faces&w=560&h=315&fit=crop&v=1519428123&auto=format&frame=1&q=92&s=76bac41cb2f43b97e6b55fdc34b1f7ca""""}}}"",""supernatural-law-grandfathered-in"",""https://www.kickstarter.com/discover/categories/comics/graphic%20novels"",""true"",""false"",""successful"",""1522083188"",""1"",""{""""web"""":{""""project"""":""""https://www.kickstarter.com/projects/1379875462/supernatural-law-grandfathered-in?ref=discovery_category_newest"""",""""rewards"""":""""https://www.kickstarter.com/projects/1379875462/supernatural-law-grandfathered-in/rewards""""}}"",""1"",""14080.0"",""international"""
"13,""My name is Scott Easley Jr or just Skoddii. Im an illustrator and writer for my graphic novel/comic series, ZOMBIE WORKSHOP"",""{""""id"""":252,""""name"""":""""Graphic Novels"""",""""analytics_name"""":""""Graphic Novels"""",""""slug"""":""""comics/graphic novels"""",""""position"""":4,""""parent_id"""":3,""""parent_name"""":""""Comics"""",""""color"""":16776056,""""urls"""":{""""web"""":{""""discover"""":""""http://www.kickstarter.com/discover/categories/comics/graphic%20novels""""}}}"",""306"",""US"",""the United States"",""1519337502"",""{""""id"""":408247096,""""name"""":""""Scott(skoddii)"""",""""is_registered"""":null,""""is_email_verified"""":null,""""chosen_currency"""":null,""""is_superbacker"""":null,""""avatar"""":{""""thumb"""":""""https://ksr-ugc.imgix.net/assets/020/330/517/383423c1c19dfbd99534c6185eb09a6f_original.png?ixlib=rb-4.0.2&w=40&h=40&fit=crop&v=1519354368&auto=format&frame=1&q=92&s=74f83e0070b20db01d5180ba214d1b5e"""",""""small"""":""""https://ksr-ugc.imgix.net/assets/020/330/517/383423c1c19dfbd99534c6185eb09a6f_original.png?ixlib=rb-4.0.2&w=80&h=80&fit=crop&v=1519354368&auto=format&frame=1&q=92&s=671b9100176dbfa63752a7a8e9cc63d0"""",""""medium"""":""""https://ksr-ugc.imgix.net/assets/020/330/517/383423c1c19dfbd99534c6185eb09a6f_original.png?ixlib=rb-4.0.2&w=160&h=160&fit=crop&v=1519354368&auto=format&frame=1&q=92&s=956c6f85ffbc3fb179c260611254a2be""""},""""urls"""":{""""web"""":{""""user"""":""""https://www.kickstarter.com/profile/408247096""""},""""api"""":{""""user"""":""""https://api.kickstarter.com/v1/users/408247096?signature=1631849432.6cc0456d4795aea0b32f861b050212afef4387ce""""}}}"",""USD"",""$"",""true"",""USD"",""1521946605"",""false"",,""1"",""200"",""1775748628"",,""false"",,""1519358205"",""{""""id"""":2383552,""""name"""":""""Columbia"""",""""slug"""":""""columbia-sc"""",""""short_name"""":""""Columbia, SC"""",""""displayable_name"""":""""Columbia, SC"""",""""localized_name"""":""""Columbia"""",""""country"""":""""US"""",""""state"""":""""SC"""",""""type"""":""""Town"""",""""is_root"""":false,""""expanded_country"""":""""United States"""",""""urls"""":{""""web"""":{""""discover"""":""""https://www.kickstarter.com/discover/places/columbia-sc"""",""""location"""":""""https://www.kickstarter.com/locations/columbia-sc""""},""""api"""":{""""nearby_projects"""":""""https://api.kickstarter.com/v1/discover?signature=1631819963.63e726eafa55ada9bb1408342a0002cf17e0998e&woe_id=2383552""""}}}"",""zombie workshop graphic novel"",,""{""""key"""":""""assets/020/330/390/59e26fe754103c70cc452239f7d1ce0c_original.png"""",""""full"""":""""https://ksr-ugc.imgix.net/assets/020/330/390/59e26fe754103c70cc452239f7d1ce0c_original.png?ixlib=rb-4.0.2&crop=faces&w=560&h=315&fit=crop&v=1519353020&auto=format&frame=1&q=92&s=b1d2849eb8ef16243a5193fd1b1ee640"""",""""ed"""":""""https://ksr-ugc.imgix.net/assets/020/330/390/59e26fe754103c70cc452239f7d1ce0c_original.png?ixlib=rb-4.0.2&crop=faces&w=352&h=198&fit=crop&v=1519353020&auto=format&frame=1&q=92&s=e4f6989e77fa03f59bda07d68d35cf54"""",""""med"""":"""

Answer 1

Hello try this.

    # Assuming your dataset is called df.
    # Create another df called subset with only 2 columns
    subset = df[['country', 'continent']]
    subset.head()
    type(subset)

Answer 2

You can parse the column with dictionary values separately. For instance:

import pandas as pd 

data = [['one', {"id":1,"name":"Graphic Novels"}], 
        ['two', {"id":2,"name":"Algorithms"}], 
        ['three', {"id":3,"name":"C++"}]]

df = pd.DataFrame(data, columns = ['column_1', 'column_2'])

new_columns = ['column_1', 'id', 'name']
new_data_frame = pd.DataFrame(columns = new_columns)

for i in range(0, len(df)):

    column_1_value = df['column_1'].iloc[i]
    dict_column = list(df['column_2'].iloc[i].values())
    print(dict_column)
    column_2_value = dict_column[0]
    column_3_value = dict_column[1]

    new_row = [column_1_value, column_2_value, column_3_value]
    new_data_frame.loc[len(new_data_frame)] = new_row

print(new_data_frame.head())

The new dataframe would be like:

  column_1 id            name
0      one  1  Graphic Novels
1      two  2      Algorithms
2    three  3             C++

Answer 3

Consider building an adjacent data frame using the DataFrame() constructor and ast.literal_eval on each row of category column. Concatenate all the resulting data frames and join it back to original data frame.

import ast
import pandas as pd

kickstarter_df = pd.read_csv("Kickstarter004.csv")

category_df = (
    pd.concat(
        [pd.DataFrame(ast.literal_eval(d))               
         for d in kickstarter_df['category']]
    )
    .add_prefix("cat_")
    .reset_index(drop=True)
)

final_df = (
    kickstarter_df
      .drop(["category"], axis="columns")
      .join(category_df)
)