我有df
ID,"url","used_at","active_seconds"
9e871f65d402254b15470881c79cec94,"mvideo.ru/smartfony-sotovye-telefony/smartfony-205",2016-04-01 00:00:00,10
8fe968e88d209b2854c47f812211cd2d,"group.aliexpress.com/ruNew.htm?spm=2114.7749990.120000116.87.rxes4x&catId=0&page=17#product-list-tab",2016-04-01 00:00:01,32
0ba8d1c3feff21ff15a86ad77ba60b9e,"hz.ru.aliexpress.com/item/Newest-1Pcs-Novelty-Design-Funny-Pvc-Fish-Shape-Zipper-Pencil-Bag-Stationery-Supplies-Pencil-Case-Fantastic/32632783689.html?aff_platform=aaf&sk=eub6yrrBy%3A&cpt=1459447196454&af=13862&cv=2043168&cn=1o4x0n v5z81gr2tvie6cjw5apalm3lr4&dp=v5_1o4x0nv5z81gr2tvie6cjw5apalm3lr4&afref=http%3A%2F%2Fvk.com%2Faway.ph&aff_trace_key=52dd417516c0437484c16009b0fab9b2-1459447196454-01255-eub6yrrBy",2016-04-01 00:00:01,24
9dedf5c86704a4ceb7d72d3b465056a0,"ru.aliexpress.com/af/category/202040573/4.html?isAffiliate=y&site=rus&shipCountry=RU&g=y&needQuery=n",2016-04-01 00:00:01,10
0e12c8425fd2dbd919feb1055b007460,"dns-shop.ru/product/4ba05489c41e3120/avtosignalizacia-starline-a61-dialog#comment",2016-04-01 00:00:02,2
dff9169891d7e5b5585c75e2391561e4,"ru.aliexpress.com/item/AEVOGUE-Cool-Cat-Eye-Sunglasses-Women-Summer-Style-Sun-Glasses-Brand-Designer-Vintage-Gafas-Oculos-De/32380450045.html",2016-04-01 00:00:02,4
5cecd2312b300766a7668784b464dd69,"ru.aliexpress.com/category/202001922/girls-clothing.html?site=rus&SortType=price_asc&g=y&shipCountry=RU&needQuery=n&isFreeShip=y&isrefine=y",2016-04-01 00:00:03,6
61d59ec6c83bacdefc510b0fe3d2c449,"ru.aliexpress.com/item/2013-autumn-new-chiffon-harem-pants-trousers-AB7-3-C40/1242434570.html?spm=2114.30010608.3.61.YAjncN&ws_ab_test=searchweb201556_9,searchweb201602_3_10036_10035_10034_507_10020_10017_10005_10006_10021_10022_10007_10018_10019,searchweb201603_9&btsid=1403b8fd-21f4-436e-920a-c329bee1586f",2016-04-01 00:00:03,329
我还有另一个df2
ID
6a1de956f88cdde3760a09922fa688d7
b285f7d87e9e85ca67b939e77ce5ba1d
fb2a53cf613e7fdfb98ef82af2db1fa6
f3a62fcfb7734537c3d798d866c905e2
8e1f1b728b235532f6e9243f8639c98e
7d276f5712e9ef6f331fc9234f28be5e
我需要从ID添加df2，所有值等于0。
我该怎么办？
答案 0 :(得分：0)
您可以在pd.concat的dfs列表中使用fillna(0)：
In [68]:
new_df = pd.concat([df,df2], ignore_index=True).fillna(0)
new_df
Out[68]:
ID active_seconds \
0 9e871f65d402254b15470881c79cec94 10.0
1 8fe968e88d209b2854c47f812211cd2d 32.0
2 0ba8d1c3feff21ff15a86ad77ba60b9e 24.0
3 9dedf5c86704a4ceb7d72d3b465056a0 10.0
4 0e12c8425fd2dbd919feb1055b007460 2.0
5 dff9169891d7e5b5585c75e2391561e4 4.0
6 5cecd2312b300766a7668784b464dd69 6.0
7 61d59ec6c83bacdefc510b0fe3d2c449 329.0
8 6a1de956f88cdde3760a09922fa688d7 0.0
9 b285f7d87e9e85ca67b939e77ce5ba1d 0.0
10 fb2a53cf613e7fdfb98ef82af2db1fa6 0.0
11 f3a62fcfb7734537c3d798d866c905e2 0.0
12 8e1f1b728b235532f6e9243f8639c98e 0.0
13 7d276f5712e9ef6f331fc9234f28be5e 0.0
url used_at
0 mvideo.ru/smartfony-sotovye-telefony/smartfony... 2016-04-01 00:00:00
1 group.aliexpress.com/ruNew.htm?spm=2114.774999... 2016-04-01 00:00:01
2 hz.ru.aliexpress.com/item/Newest-1Pcs-Novelty-... 2016-04-01 00:00:01
3 ru.aliexpress.com/af/category/202040573/4.html... 2016-04-01 00:00:01
4 dns-shop.ru/product/4ba05489c41e3120/avtosigna... 2016-04-01 00:00:02
5 ru.aliexpress.com/item/AEVOGUE-Cool-Cat-Eye-Su... 2016-04-01 00:00:02
6 ru.aliexpress.com/category/202001922/girls-clo... 2016-04-01 00:00:03
7 ru.aliexpress.com/item/2013-autumn-new-chiffon... 2016-04-01 00:00:03
8 0 0
9 0 0
10 0 0
11 0 0
12 0 0
13 0 0