Question

我的问题如下：
我有一个csv文件，其行通常以'200'开头。在此文件中有不需要的换行符。

E.g。

200 Peter Pan 
200 John Smith 
200 Susan Murray 
200 Harald  
Williams
200 Liam Noah

这就是文件最后的样子：

200 Peter Pan
200 John Smith
200 Susan Murray
200 Harald Williams
200 Liam Noah

因此，每当一行不以'200'开头时，它应该附加到前一行。我希望这对Python来说应该很容易，但到目前为止我还没有把它弄好。

Answer 1

with open(<file_name>, 'r+') as file:
    text = str();
    for line in file:
        if line[0:3] == "200":
            text = "{}\n{}".format(text, line.strip());
        else:
            text = "{} {}".format(text, line.strip());
    file.seek(0);
    file.write(text[1:]);

Answer 2

以下代码将完成这项工作......

file名为file.csv，内容为：

200 Peter Pan 
200 John Smith 
200 Susan Murray 
200 Harald  
Williams
200 Liam Noah

我们运行以下script：

之后

lines = open("file.csv", "r").read().split("\n")
for i, line in enumerate(lines):
   if not line.startswith("200"):
      lines[i-1] = lines[-1].strip() + " " + line
      lines.pop(i)

open("file.csv", "w").write("\n".join(lines)+"\n")

file已根据您的需要更新：

200 Peter Pan
200 John Smith
200 Susan Murray
200 Harald Williams
200 Liam Noah

它是如何运作的？

步骤：

在.csv文件中以string的身份将其转换为list lines splitting string '\n'新enumerated -line（lines）character。
遍历list variables index and the，因此我们有两个line可以使用："200"行。
检查append是否以line开头。
如果有，line index到stripping一个line之前（line之前list并添加空格之间），然后从lines popping移除index open .csv。
最后，我们file writing write与lines相同string新list lines。来自line的{{1}}的{{1}}是通过在每个<?xml version="1.0" encoding="utf-8"?>  <configuration> <configSections> <section name="nlog" type="NLog.Config.ConfigSectionHandler, NLog" /> </configSections> <appSettings> <add key="webpages:Version" value="3.0.0.0" /> <add key="webpages:Enabled" value="false" /> <add key="PreserveLoginUrl" value="true" /> <add key="ClientValidationEnabled" value="true" /> <add key="UnobtrusiveJavaScriptEnabled" value="true" /> <add key="TemporaryUploadPath" value="" /> </appSettings> <system.web> <compilation debug="true" /> <httpRuntime maxRequestLength="2147483647"/> <pages> <namespaces> <add namespace="System.Web.Helpers" /> <add namespace="System.Web.Mvc" /> <add namespace="System.Web.Mvc.Ajax" /> <add namespace="System.Web.Mvc.Html" /> <add namespace="System.Web.Routing" /> <add namespace="System.Web.WebPages" /> </namespaces> </pages> <httpModules /> </system.web> <system.webServer> <validation validateIntegratedModeConfiguration="false" /> <modules /> <handlers> <remove name="ExtensionlessUrlHandler-Integrated-4.0" /> <remove name="OPTIONSVerbHandler" /> <remove name="TRACEVerbHandler" /> <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" /> </handlers> <security> <requestFiltering> <requestLimits maxAllowedContentLength="2147483647" /> </requestFiltering> </security> </system.webServer> <runtime> <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"> <dependentAssembly> <assemblyIdentity name="System.IO.Compression.ZipFile" publicKeyToken="31bf3856ad364e35" culture="neutral" /> <bindingRedirect oldVersion="0.0.0.0-4.3.0.0" newVersion="4.3.0.0" /> </dependentAssembly> <dependentAssembly> <assemblyIdentity name="System.Net.Http.Formatting" publicKeyToken="31bf3856ad364e35" culture="neutral" /> <bindingRedirect oldVersion="0.0.0.0-5.2.3.0" newVersion="5.2.3.0" /> </dependentAssembly> <dependentAssembly> <assemblyIdentity name="Newtonsoft.Json" culture="neutral" publicKeyToken="30ad4fe6b2a6aeed" /> <bindingRedirect oldVersion="0.0.0.0-10.0.0.0" newVersion="10.0.0.0" /> </dependentAssembly> <dependentAssembly> <assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" /> <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" /> </dependentAssembly> <dependentAssembly> <assemblyIdentity name="System.Web.Http" publicKeyToken="31bf3856ad364e35" culture="neutral" /> <bindingRedirect oldVersion="0.0.0.0-5.2.3.0" newVersion="5.2.3.0" /> </dependentAssembly> <dependentAssembly> <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" /> <bindingRedirect oldVersion="1.0.0.0-5.2.3.0" newVersion="5.2.3.0" /> </dependentAssembly> <dependentAssembly> <assemblyIdentity name="System.Web.Optimization" publicKeyToken="31bf3856ad364e35" /> <bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="1.1.0.0" /> </dependentAssembly> <dependentAssembly> <assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" /> <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" /> </dependentAssembly> <dependentAssembly> <assemblyIdentity name="WebGrease" publicKeyToken="31bf3856ad364e35" /> <bindingRedirect oldVersion="0.0.0.0-1.5.2.14234" newVersion="1.5.2.14234" /> </dependentAssembly> </assemblyBinding> </runtime> <nlog xsi:schemaLocation="http://www.nlog-project.org/schemas/NLog.xsd NLog.xsd" autoReload="true" throwExceptions="false" xmlns="http://www.nlog-project.org/schemas/NLog.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <variable name="logPath" value="${basedir}\Logs" /> <targets async="true"> <target xsi:type="File" name="default" layout="${longdate} - ${level:uppercase=true}: ${message}${onexception:${newline}EXCEPTION\: ${exception:format=ToString}}" fileName="${logPath}\bds.api.log" keepFileOpen="false" archiveFileName="${logPath}\bds.api_${shortdate}.{##}.log" archiveNumbering="Sequence" archiveEvery="Day" maxArchiveFiles="30" /> </targets> <rules> <logger name="*" minlevel="Info" writeTo="default" /> </rules> </nlog> <system.codedom> <compilers> <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.4.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:7 /nowarn:1659;1699;1701" /> <compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.4.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:15 /nowarn:41008 /define:_MYTYPE=\"Web\" /optionInfer+" /> </compilers> </system.codedom> </configuration>之间添加换行符来获得的，最后在末尾添加一个额外的字符。

希望这会帮助你！

Answer 3

读取csv文件并遍历行：

with open('test.csv', 'r') as f:
    f_csv = csv.reader(f)
    # header = next(f_csv)
    for row in f_csv:
        if not row.startswith(200):
            #append previous row

Answer 4

对我来说完全正常的代码如下：

with open('testing2.CSV', 'r+', encoding="utf-8") as file:
    text = str();
    for line in file:
        if line[0:3] == "200":
            text = text + '\n';
        text = text + line.strip();
    file.seek(0);
    file.write(text);

它甚至保留第一行，因为我的CSV文件有标题。感谢所有在这里帮助的人，特别是Benjamin James Drury和Joe Iddon。

当它以'200'

4 个答案: