[Python pandas] 데이터프레임(dataframe)에서 null 값만 찾아내기

라이브러리 및 데이터 불러오기

# 라이브러리
import pandas as pd

# 데이터
mock_data = pd.read_csv('MOCK_DATA.csv')
mock_data.head(3)

	id	ssn	first_name	last_name	email	gender	ip_address	city	country	car_make	car_model
0	1	352-83-7834	Josselyn	Commuzzo	jcommuzzo0@shop-pro.jp	Female	NaN	Aībak	Afghanistan	GMC	Yukon XL 2500
1	2	129-55-2802	Aksel	Cubbin	acubbin1@rakuten.co.jp	Male	NaN	Gaya	Nigeria	Cadillac	CTS
2	3	421-78-0056	Marwin	Vagg	NaN	Male	NaN	Huangjiakou	China	Chevrolet	Tahoe

데이터 프레임 전체의 null 값 출력하기

test1 = mock_data[mock_data.isnull().any(1)]
test1.head()

	id	ssn	first_name	last_name	email	gender	ip_address	city	country	car_make	car_model
0	1	352-83-7834	Josselyn	Commuzzo	jcommuzzo0@shop-pro.jp	Female	NaN	Aībak	Afghanistan	GMC	Yukon XL 2500
1	2	129-55-2802	Aksel	Cubbin	acubbin1@rakuten.co.jp	Male	NaN	Gaya	Nigeria	Cadillac	CTS
2	3	421-78-0056	Marwin	Vagg	NaN	Male	NaN	Huangjiakou	China	Chevrolet	Tahoe
3	4	NaN	Michele	Freed	NaN	Male	95.30.236.76	Ferrol	Spain	Volvo	NaN
7	8	738-62-4156	Amery	Sizeland	asizeland7@yale.edu	Male	NaN	Gunungmalang Satu	Indonesia	Lexus	LX

특정 칼럼의 null 값만 출력

test2 = mock_data[mock_data.ip_address.isnull()]
test2

	id	ssn	first_name	last_name	email	gender	ip_address	city	country	car_make	car_model
0	1	352-83-7834	Josselyn	Commuzzo	jcommuzzo0@shop-pro.jp	Female	NaN	Aībak	Afghanistan	GMC	Yukon XL 2500
1	2	129-55-2802	Aksel	Cubbin	acubbin1@rakuten.co.jp	Male	NaN	Gaya	Nigeria	Cadillac	CTS
2	3	421-78-0056	Marwin	Vagg	NaN	Male	NaN	Huangjiakou	China	Chevrolet	Tahoe
7	8	738-62-4156	Amery	Sizeland	asizeland7@yale.edu	Male	NaN	Gunungmalang Satu	Indonesia	Lexus	LX
9	10	344-02-8451	Fernande	Mordey	NaN	Female	NaN	Nurlat	Russia	Dodge	Caravan
11	12	306-11-6909	Otis	Harriott	oharriottb@fema.gov	Male	NaN	Francisco Morato	Brazil	Chevrolet	Corvette
12	13	176-22-8123	Xever	MacLachlan	xmaclachlanc@msu.edu	Male	NaN	Zalewo	Poland	Land Rover	Discovery
13	14	150-25-6348	Roze	Bestwick	rbestwickd@creativecommons.org	Female	NaN	Annopol	Poland	Ford	F250
15	16	114-34-3979	Anett	Crocket	NaN	Female	NaN	Hepo	China	NaN	9-3
32	33	649-34-5986	Emerson	Janous	ejanousw@google.com	Male	NaN	Kleszczewo	Poland	Audi	RS6
35	36	130-97-3853	Danya	Petts	dpettsz@pen.io	Male	NaN	Lifuta	China	Toyota	Corolla
38	39	510-25-5874	Franklin	Rivalant	NaN	Male	NaN	Liwan	Philippines	Saab	9-2X
41	42	210-93-6061	Georgie	Lude	glude15@census.gov	Female	NaN	Várzea Alegre	Brazil	Dodge	Ram 1500
50	51	NaN	Oby	Sabban	osabban1e@google.co.uk	Male	NaN	Beranci	Macedonia	Dodge	NaN
63	64	723-98-3328	Jenifer	Popov	jpopov1r@1und1.de	Female	NaN	Homa Bay	Kenya	NaN	Insight
76	77	757-21-7105	Chloe	Dows	cdows24@pinterest.com	Female	NaN	Saurimo	Angola	Jeep	Cherokee
77	78	895-24-7945	Paddie	Carnow	pcarnow25@utexas.edu	Male	NaN	Livingstone	Zambia	NaN	Sentra
78	79	NaN	Wyn	Sephton	wsephton26@scientificamerican.com	Male	NaN	La Palma	Mexico	Ford	NaN
85	86	891-33-2719	Camile	Menego	NaN	Female	NaN	Kalandagan	Philippines	Hyundai	Sonata
88	89	711-01-1786	Uriel	Conyard	uconyard2g@tuttocitta.it	Male	NaN	Bodiosa a Velha	Portugal	NaN	A6
89	90	NaN	Anne	Thorbon	athorbon2h@boston.com	Female	NaN	Österbybruk	Sweden	Mitsubishi	NaN
90	91	462-86-8940	Melvin	State	mstate2i@go.com	Male	NaN	Tojeira	Portugal	Mitsubishi	Precis
92	93	601-81-1911	Siward	Pachmann	spachmann2k@squidoo.com	Male	NaN	Tegallega	Indonesia	Lincoln	LS
93	94	822-90-3057	Carla	Halcro	chalcro2l@miibeian.gov.cn	Female	NaN	Mao’er	China	Ford	F-Series
96	97	759-59-6263	Paul	Benedick	pbenedick2o@wsj.com	Male	NaN	Bohdalov	Czech Republic	Toyota	Camry Hybrid
98	99	128-72-5161	Lazarus	Gravestone	lgravestone2q@blog.com	Male	NaN	Donghe	China	Chrysler	Cirrus
103	104	366-43-8448	Othilia	Underhill	ounderhill2v@cnet.com	Female	NaN	Carreira	Portugal	Kia	Sportage
111	112	381-53-1857	Arch	Tissier	atissier33@bbb.org	Male	NaN	Pagedangan	Indonesia	Volkswagen	Type 2
116	117	740-80-4836	Vale	Waything	vwaything38@zimbio.com	Female	NaN	Lutou	China	Mazda	B-Series
118	119	677-56-9911	Hugo	Dwelly	NaN	Male	NaN	Rozhdestveno	Russia	Mazda	Protege
...	...	...	...	...	...	...	...	...	...	...	...
895	896	123-73-0327	Meg	Lodwick	mlodwickov@tripod.com	Female	NaN	Ulaan-Uul	Mongolia	Ford	Ranger
899	900	642-70-5125	Ringo	Guidelli	rguidellioz@youtube.com	Male	NaN	Klek	Serbia	Mazda	B-Series
901	902	720-56-4412	Marcellina	Albrighton	malbrightonp1@clickbank.net	Female	NaN	Străşeni	Moldova	Kia	Carens
903	904	764-01-5996	Alameda	Pover	apoverp3@oaic.gov.au	Female	NaN	Serowe	Botswana	Cadillac	DTS
906	907	277-41-9776	Dickie	Moff	dmoffp6@google.co.uk	Male	NaN	Cayenne	French Guiana	Land Rover	Range Rover
907	908	221-77-3230	Antonius	Dulinty	adulintyp7@scientificamerican.com	Male	NaN	Luofang	China	Infiniti	QX
910	911	281-06-1569	Virge	Mawer	vmawerpa@plala.or.jp	Male	NaN	Mafang	China	GMC	Safari
912	913	837-74-6106	Ricca	Muncaster	rmuncasterpc@who.int	Female	NaN	Marianowo	Poland	Volvo	S40
917	918	NaN	Eadie	Krikorian	ekrikorianph@homestead.com	Female	NaN	Zhongxin	China	NaN	NaN
920	921	414-86-2458	Hinda	Macek	hmacekpk@storify.com	Female	NaN	Hermoso Campo	Argentina	Bentley	Continental GTC
923	924	866-13-1773	Collin	Hallgarth	challgarthpn@ed.gov	Male	NaN	Changmaoling	China	Mercedes-Benz	CL-Class
927	928	895-59-9870	Bailey	Gallehawk	NaN	Male	NaN	Vänersborg	Sweden	Chevrolet	Camaro
929	930	156-42-3747	Lodovico	Davidoff	ldavidoffpt@csmonitor.com	Male	NaN	Riangblolong	Indonesia	Maybach	57
931	932	669-37-8359	Heinrick	Pummery	hpummerypv@shareasale.com	Male	NaN	Cilolohan	Indonesia	Ford	E-Series
935	936	161-19-3513	Hymie	Cescoti	NaN	Male	NaN	Labège	France	NaN	Marquis
936	937	540-78-7735	Shirlene	Annand	sannandq0@examiner.com	Female	NaN	Néa Mákri	Greece	Toyota	Paseo
937	938	NaN	Talbot	Vogt	tvogtq1@princeton.edu	Male	NaN	Barengkok Hilir	Indonesia	Toyota	NaN
938	939	720-94-5474	Ruddy	Banville	rbanvilleq2@nymag.com	Male	NaN	Conel	Philippines	Chevrolet	Impala
947	948	812-90-5359	Bertrando	MacKissack	NaN	Male	NaN	Gōtsuchō	Japan	Mitsubishi	Truck
953	954	435-20-9028	Filia	Freddi	ffreddiqh@stanford.edu	Female	NaN	Changqi	China	Buick	Enclave
956	957	520-13-6907	Pansy	Janowski	pjanowskiqk@w3.org	Female	NaN	Huashi	China	Mercury	Grand Marquis
957	958	682-62-4676	Inger	Clissett	iclissettql@twitter.com	Female	NaN	Rushankou	China	Suzuki	SX4
960	961	NaN	Page	Haswall	NaN	Female	NaN	Birmingham	United States	Ford	NaN
974	975	782-21-6640	Elwyn	Vanyard	evanyardr2@psu.edu	Male	NaN	Hebian	China	GMC	Rally Wagon G3500
976	977	NaN	Evered	Sandy	esandyr4@mapy.cz	Male	NaN	Thị Trấn Triệu Sơn	Vietnam	Dodge	NaN
983	984	189-01-2669	Mandie	McTrustam	mmctrustamrb@vistaprint.com	Female	NaN	Ndeaboh	Nigeria	NaN	Matrix
984	985	364-73-3686	Meredeth	Harwin	mharwinrc@nifty.com	Male	NaN	Kokkini Trimithia	Cyprus	NaN	Elantra
988	989	335-83-3780	Ddene	Carson	dcarsonrg@paypal.com	Female	NaN	Pule	Indonesia	Lincoln	Town Car
991	992	478-07-5855	Genovera	Conneau	gconneaurj@rambler.ru	Female	NaN	Miedzichowo	Poland	Lexus	LS
998	999	292-06-1002	Ilario	Hallt	ihalltrq@google.nl	Male	NaN	Ouanaminthe	Haiti	Chevrolet	Monte Carlo

283 rows × 11 columns