我有两个数据框，我想加入它们，以便我可以在一个数据框中检查每一周的数量。
2018-04-24 11:59:24,620 [ajp-apr-8009-exec-9] [ERROR] (o.a.s.a.AccessServiceImpl:1070) - Error during access server backup
org.jfrog.access.client.AccessClientHttpException: HTTP response status 401:Failed on executing /api/v1/system/backup/export, with response: {"errors":[{"code":"UNAUTHORIZED","detail":"Bad credentials","message":"HTTP 401 Unauthorized"}]}
at org.jfrog.access.client.http.AccessHttpClient.createRestResponse(AccessHttpClient.java:154)
at org.jfrog.access.client.http.AccessHttpClient.restCall(AccessHttpClient.java:113)
at org.jfrog.access.client.system.SystemClientImpl.exportAccessServer(SystemClientImpl.java:21)
at org.artifactory.security.access.AccessServiceImpl.exportTo(AccessServiceImpl.java:1060)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:201)
at com.sun.proxy.$Proxy144.exportTo(Unknown Source)
at org.artifactory.spring.ArtifactoryApplicationContext.exportTo(ArtifactoryApplicationContext.java:662)
at org.artifactory.ui.rest.service.admin.importexport.exportdata.ExportSystemService.execute(ExportSystemService.java:67)
at org.artifactory.rest.common.service.ServiceExecutor.process(ServiceExecutor.java:38)
at org.artifactory.rest.common.resource.BaseResource.runService(BaseResource.java:92)
at org.artifactory.ui.rest.resource.admin.importexport.ExportArtifactResource.exportSystem(ExportArtifactResource.java:65)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)
at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:205)
at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1542)
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1473)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1409)
at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:409)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:558)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:733)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.artifactory.webapp.servlet.RepoFilter.execute(RepoFilter.java:184)
at org.artifactory.webapp.servlet.RepoFilter.doFilter(RepoFilter.java:93)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.artifactory.webapp.servlet.AccessFilter.useAuthentication(AccessFilter.java:403)
at org.artifactory.webapp.servlet.AccessFilter.doFilterInternal(AccessFilter.java:212)
at org.artifactory.webapp.servlet.AccessFilter.doFilter(AccessFilter.java:166)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.artifactory.webapp.servlet.RequestFilter.doFilter(RequestFilter.java:67)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.springframework.session.web.http.SessionRepositoryFilter.doFilterInternal(SessionRepositoryFilter.java:164)
at org.springframework.session.web.http.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:80)
at org.artifactory.webapp.servlet.SessionFilter.doFilter(SessionFilter.java:62)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.artifactory.webapp.servlet.ArtifactoryFilter.doFilter(ArtifactoryFilter.java:128)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:94)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:502)
at org.apache.coyote.ajp.AbstractAjpProcessor.process(AbstractAjpProcessor.java:877)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2527)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2516)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
2018-04-24 11:59:24,660 [ajp-apr-8009-exec-9] [INFO ] (o.a.s.ArtifactoryApplicationContext:819) - Note: the etc exported folder has excessive permissions. Be careful with the files.
我想加入两个数据框，如结果所示，我想在一个数据框中追加每个城市每周的数量。
df1= City Week qty Year
hyd 35 10 2015
hyd 36 15 2015
hyd 37 11 2015
hyd 42 10 2015
hyd 23 10 2016
hyd 32 15 2016
hyd 37 11 2017
hyd 42 10 2017
pune 35 10 2015
pune 36 15 2015
pune 37 11 2015
pune 42 10 2015
pune 23 10 2016
pune 32 15 2016
pune 37 11 2017
pune 42 10 2017
df2= city Week qty Year
hyd 23 10 2015
hyd 32 15 2015
hyd 35 12 2016
hyd 36 15 2016
hyd 37 11 2016
hyd 42 10 2016
hyd 43 12 2016
hyd 44 18 2016
hyd 35 11 2017
hyd 36 15 2017
hyd 37 11 2017
hyd 42 10 2017
hyd 51 14 2017
hyd 52 17 2017
pune 35 12 2016
pune 36 15 2016
pune 37 11 2016
pune 42 10 2016
pune 43 12 2016
pune 44 18 2016
pune 35 11 2017
pune 36 15 2017
pune 37 11 2017
pune 42 10 2017
pune 51 14 2017
pune 52 17 2017
答案 0 :(得分：1)
您可以将您的任务分解为几个步骤：
df1和df2。Week。axis=1和reset_index。以下是一个例子：
df = pd.concat([df1, df2], ignore_index=True)
dfs = [df[df['Year'] == y].rename(columns=lambda x: x+'_'+str(y) if x != 'Week' else x)\
.set_index('Week') for y in df['Year'].unique()]
res = pd.concat(dfs, axis=1).reset_index()
结果：
print(res)
Week qty_2015 Year_2015 qty_2016 Year_2016 qty_2017 Year_2017
0 35 10.0 2015.0 12.0 2016.0 11.0 2017.0
1 36 15.0 2015.0 15.0 2016.0 15.0 2017.0
2 37 11.0 2015.0 11.0 2016.0 11.0 2017.0
3 42 10.0 2015.0 10.0 2016.0 10.0 2017.0
4 43 NaN NaN 12.0 2016.0 NaN NaN
5 44 NaN NaN 18.0 2016.0 NaN NaN
6 51 NaN NaN NaN NaN 14.0 2017.0
7 52 NaN NaN NaN NaN 17.0 2017.0
答案 1 :(得分：1)
就我个人而言，我认为您的示例输出是可读的，因此除非您因特定原因需要该格式，否则我可能会考虑使用数据透视表。我还认为所需的代码更清晰。
import pandas as pd
df3 = pd.concat([df1, df2], ignore_index=True)
df4 = df3.pivot(index='Week', columns='Year', values='qty')
print(df4)
Year 2015 2016 2017
Week
35 10.0 12.0 11.0
36 15.0 15.0 15.0
37 11.0 11.0 11.0
42 10.0 10.0 10.0
43 NaN 12.0 NaN
44 NaN 18.0 NaN
51 NaN NaN 14.0
52 NaN NaN 17.0