Writing CSV files in Python - GeeksforGeeks

csv.writer class is used to insert data to the CSV file. This class returns a writer object which is responsible for converting the user's data ... Skiptocontent CoursesGeekWeek2022ForWorkingProfessionalsDSAClasses(Live)SystemDesign(Live)JavaBackendDeveloper(Live)FullStack(Live)ExploreMoreLiveCoursesDSA(Self-Paced)SDETheory(Self-Paced)AllDevelopmentCourses(Self-Paced)ExploreMoreSelf-PacedCoursesForStudentsCompetitiveProgramming(Live)GATECourse2023(Live)DataScience(Live)ExploreMoreLiveCoursesDSA(Self-Paced)CIP(Self-Paced)JAVA/Python/C++(Self-Paced)ExploreMoreSelf-PacedCoursesSchoolCoursesSchoolGuidePythonProgrammingLearnToMakeAppsExploremoreAllCoursesTutorialsAlgorithmsAnalysisofAlgorithmsAsymptoticAnalysisWorst,AverageandBestCasesAsymptoticNotationsLittleoandlittleomeganotationsLowerandUpperBoundTheoryAnalysisofLoopsSolvingRecurrencesAmortizedAnalysisWhatdoes'SpaceComplexity'mean?Pseudo-polynomialAlgorithmsPolynomialTimeApproximationSchemeATimeComplexityQuestionSearchingAlgorithmsSortingAlgorithmsGraphAlgorithmsPatternSearchingGeometricAlgorithmsMathematicalBitwiseAlgorithmsRandomizedAlgorithmsGreedyAlgorithmsDynamicProgrammingDivideandConquerBacktrackingBranchandBoundAllAlgorithmsDataStructuresArraysLinkedListStackQueueBinaryTreeBinarySearchTreeHeapHashingGraphAdvancedDataStructureMatrixStringsAllDataStructuresInterviewCornerCompanyPreparationTopTopicsPracticeCompanyQuestionsInterviewExperiencesExperiencedInterviewsInternshipInterviewsCompetititveProgrammingDesignPatternsSystemDesignTutorialMultipleChoiceQuizzesLanguagesCC++JavaPythonC#SQLScalaPerlGoLanguageKotlinWebDevelopmentHTMLCSSJavaScriptPHPCSSFrameworksBootstrapTailwindCSSFoundationCSSMaterializeCSSBulmaPureCSSPrimerCSSBlazeUISemanticUIJavaScriptFrameworksAngularJSNodeJSJavaScriptLibrariesjQueryReactJSML&DataScienceMachineLearningDataScienceCSSubjectsMathematicsOperatingSystemDBMSComputerNetworksComputerOrganizationandArchitectureTheoryofComputationCompilerDesignDigitalLogicSoftwareEngineeringGATEGATEComputerScienceNotesLastMinuteNotesGATECSSolvedPapersGATECSOriginalPapersandOfficialKeysGATE2021DatesGATECS2021SyllabusImportantTopicsforGATECSSoftwareDesignsSoftwareDesignPatternsSystemDesignTutorialGFGSheetsWebDevCheatSheetsHTMLCheatSheetCSSCheatSheetJSCheatSheetjQueryCheatSheetCompany-WiseSDESheetsFacebookSDESheetAmazonSDESheetAppleSDESheetNetflixSDESheetGoogleSDESheetWiproCodingSheetInfosysCodingSheetTCSCodingSheetCognizantCodingSheetHCLCodingSheetDSASheetsSDESheetFAANGCodingSheetLoveBabbarSheetMassRecruiterSheetProduct-BasedCodingSheetCompany-WisePreparationSheetArraySheetStringSheetTreeSheetGraphSheetDPSheetSchoolLearningSchoolProgrammingMathematicsNumberSystemAlgebraTrigonometryStatisticsProbabilityGeometryMensurationCalculusMathsNotes(Class8-12)Class8NotesClass9NotesClass10NotesClass11NotesClass12NotesNCERTSolutionsClass8MathsSolutionClass9MathsSolutionClass10MathsSolutionClass11MathsSolutionClass12MathsSolutionRDSharmaSolutionsClass8MathsSolutionClass9MathsSolutionClass10MathsSolutionClass11MathsSolutionClass12MathsSolutionPhysicsNotes(Class8-11)Class8NotesClass9NotesClass10NotesClass11NotesChemistryNotesClass8NotesClass9NotesClass10NotesBusinessStudies(Class11th)BusinessStudies(Class12th)CSExams/PSUsISROISROCSOriginalPapersandOfficialKeysISROCSSolvedPapersISROCSSyllabusforScientist/EngineerExamUGCNETUGCNETCSNotesPaperIIUGCNETCSNotesPaperIIIUGCNETCSSolvedPapersStudentCampusAmbassadorProgramSchoolAmbassadorProgramProjectGeekoftheMonthCampusGeekoftheMonthPlacementCourseCompetititveProgrammingTestimonialsStudentChapterGeekontheTopInternshipCareersUPSCGeographyNotesHistoryNotesScience&Tech.NotesEthicsNotesPolityNotesEconomicsNotesUPSCPreviousYearPapersSSCCGLSSCCGLSyllabusGeneralStudiesEnglishReasoningSubjectwisePracticePapersPreviousYearPapersBankingExamsSBIClerkSBIClerkSyllabusGeneralAwarenessEnglishQuantitativeAptitudeReasoningAbilitySBIClerkPracticePapersSBIPOSBIPOSyllabusGeneralAwarenessEnglishQuantitativeAptitudeReasoningAbilityPreviousYearPapersSBIPOPracticePapersIBPSPOIBPSPO2022SyllabusEnglishNotesReasoningNotesPreviousYearPapersMockQuestionPapersIBPSClerkIBPSClerkSyllabusEnglishNotesPreviousYearPapersJobsApplyforJobsPostaJobHirewithUsKnowaboutJobathonJobathonPracticeAllDSAProblemsProblemoftheDayInterviewSeries:WeeklyContestsBi-WizardCoding:SchoolContestsEventsPracticeSDESheetCuratedDSAListsTop50ArrayProblemsTop50StringProblemsTop50TreeProblemsTop50GraphProblemsTop50DPProblemsContests HomeSavedVideosCoursesGBlogPuzzlesWhat'sNew? ChangeLanguage DataStructuresAlgorithmsInterviewPreparationTopic-wisePracticeC++JavaPythonCompetitiveProgrammingMachineLearningJavaScriptSDESheetPuzzlesGFGSchoolProjects RelatedArticles ▲RelatedArticlesIntroductionPythonProgrammingLanguageIntroductionToPYTHONPythonLanguageadvantagesandapplicationsDownloadandInstallPython3LatestVersionPython3basicsPythonKeywordsNamespacesandScopeinPythonStatement,IndentationandCommentinPythonHowtoassignvaluestovariablesinPythonandotherlanguagesInput/OutputTakinginputinPythonTakinginputfromconsoleinPythonTakingmultipleinputsfromuserinPythonPython|Outputusingprint()functionHowtoprintwithoutnewlineinPython?Pythonendparameterinprint()Python|sepparameterinprint()Python|OutputFormattingOperatorsPythonOperatorsTernaryOperatorinPythonDivisionOperatorsinPythonOperatorOverloadinginPythonAnyAllinPythonOperatorFunctionsinPython|Set1OperatorFunctionsinPython|Set2Differencebetween==andisoperatorinPythonPythonMembershipandIdentityOperatorsDataTypesPython|Set3(Strings,Lists,Tuples,Iterations)PythonStringPythonListsPythonTuplesPythonSetsPythonDictionaryPythonArraysControlFlowControlFlowinPythonChainingcomparisonoperatorsinPythonPythonForLoopsPythonWhileLoopPythonbreakstatementPythonContinueStatementPythonpassStatementLoopingTechniquesinPythonFunctionsPythonFunctions*argsand**kwargsinPythonWhentouseyieldinsteadofreturninPython?GeneratorsinPythonPythonlambdaGlobalandLocalVariablesinPythonGlobalkeywordinPythonFirstClassfunctionsinPythonPythonClosuresDecoratorsinPythonDecoratorswithparametersinPythonMemoizationusingdecoratorsinPythonPythonOOPPythonClassesandObjectsConstructorsinPythonDestructorsinPythonInheritanceinPythonTypesofinheritancePythonEncapsulationinPythonPolymorphisminPythonClassorStaticVariablesinPythonClassmethodvsStaticmethodinPythonExceptionHandlingPythonExceptionHandlingPythonTryExceptErrorsandExceptionsinPythonBuilt-inExceptionsinPythonUser-definedExceptionsinPythonwithExamplesNZECerrorinPythonFilehandlingFileHandlinginPythonOpenaFileinPythonHowtoreadfromafileinPythonWritingtofileinPythonPythonappendtoafilePythonRegexRegularExpressioninPythonwithExamples|Set1RegularExpressionsinPython–Set2(Search,MatchandFindAll)PythonRegex:re.search()VSre.findall()VerboseinPythonRegexPasswordvalidationinPythonPythonCollectionsPythonCollectionsModuleCountersinPython|Set1(InitializationandUpdation)OrderedDictinPythonDefaultdictinPythonChainMapinPythonNamedtupleinPythonDequeinPythonHeapqueue(orheapq)inPythonCollections.UserDictinPythonCollections.UserListinPythonCollections.UserStringinPythonPythonAdvanceOSModuleinPythonwithExamplesFunctionalProgramminginPythonMetaprogrammingwithMetaclassesinPythonAbstractClassesinPythonMultithreadinginPython|Set1MultithreadinginPython|Set2(Synchronization)MultiprocessinginPython|Set1(Introduction)MultiprocessinginPython|Set2(Communicationbetweenprocesses)SocketProgramminginPythonSocketProgrammingwithMulti-threadinginPythonPythonNumPyNumPyTutorialPythonNumpyNumpy|ndarrayNumpy|ArrayCreationNumpy|IndexingBasicSlicingandAdvancedIndexinginNumPyPythonNumpy|DataTypeObjectsNumpy|IteratingOverArrayNumpy|BinaryOperationsNumpy|MathematicalFunctionNumpy|StringOperationsNumpy|LinearAlgebraNumpy|Sorting,SearchingandCountingRandomsamplinginnumpy|randint()functionRandomsamplinginnumpy|random_sample()functionRandomsamplinginnumpy|ranf()functionRandomsamplinginnumpy|random_integers()functionNumpyufunc|UniversalfunctionsPythonPandasPandasTutorialIntroductiontoPandasinPythonHowtoInstallPythonPandasonWindowsandLinux?Python|PandasDataFrameCreatingaPandasDataFramePython|PandasSeriesCreatingaPandasSeriesPython|PandasDataframe/Series.head()methodPython|PandasDataframe.describe()methodDealingwithRowsandColumnsinPandasDataFramePython|PandasExtractingrowsusing.loc[]Python|ExtractingrowsusingPandas.iloc[]IndexingandSelectingDatawithPandasBooleanIndexinginPandasPandasGroupByPython|PandasMerging,Joining,andConcatenatingPython|WorkingwithdateandtimeusingPandasPython|PandasWorkingWithTextDataPython|Readcsvusingpandas.read_csv()Python|WorkingwithPandasandXlsxWriter|Set–1PythonDjangoDjangoTutorialDjangoBasicsDjangoIntroductionandInstallationDjangoProjectMVTStructureHowtoCreateaBasicProjectusingMVTinDjango?HowtoCreateanAppinDjango?DjangoFormsRenderHTMLForms(GET&POST)inDjangoDjangoformfieldcustomwidgetsDjangoModelForm–CreateformfromModelsDjangoFormsetsDjangoModelFormSetsDjangoTemplatesViewsInDjango|PythonDjangoCRUD(Create,Retrieve,Update,Delete)FunctionBasedViewsClassBasedGenericViewsDjango(Create,Retrieve,Update,Delete)DjangoModelsDjangoORM–Inserting,Updating&DeletingDataDjangoBasicAppModel–MakemigrationsandMigratePythonJSONPythonJSONWorkingWithJSONDatainPythonRead,WriteandParseJSONusingPythonAppendtoJSONfileusingPythonSerializingJSONdatainPythonDeserializeJSONtoObjectinPythonPythonCSVWorkingwithcsvfilesinPythonReadingCSVfilesinPythonWritingCSVfilesinPythonPythonMySQLPythonMySQLConnectMySQLdatabaseusingMySQL-ConnectorPythonPythonMySQL–CreateDatabasePython:MySQLCreateTablePythonMySQL–InsertintoTablePythonMySQL–SelectQueryPythonMySQL–WhereClausePythonMySQL–OrderByClausePythonMySQL–DeleteQueryPythonMySQL–DropTablePythonMySQL–UpdateQueryPythonMySQL–LimitClausePythonMySQL–JoinPythonMongoDBPythonMongoDBTutorialInstallingMongoDBonWindowswithPythonMongoDBandPythonCreateadatabaseinMongoDBusingPythonPythonMongoDB–insert_oneQueryPythonMongoDB–insert_manyQueryPythonMongoDB–FindPythonMongoDB–QueryPythonMongoDB–SortMongoDBpython|DeleteDataandDropCollectionPythonMongodb–Delete_one()PythonMongodb–Delete_many()PythonMongoDB–Update_one()PythonMongoDB–Update_manyQueryPythonMongoDB–LimitQueryPythonMongoDB–create_indexQueryPythonMongoDB–drop_indexQueryPythonOpenCVOpenCVPythonTutorialIntroductiontoOpenCVHowtoInstallOpenCVforPythononWindows?ReadinganimageinOpenCVusingPythonOpenCV|SavinganImageArithmeticOperationsonImagesusingOpenCV|Set-1(AdditionandSubtraction)ArithmeticOperationsonImagesusingOpenCV|Set-2(BitwiseOperationsonBinaryImages)ImageResizingusingOpenCV|PythonImageProcessinginPython(Scaling,Rotating,ShiftingandEdgeDetection)Python|ImageblurringusingOpenCVErosionandDilationofimagesusingOpenCVinpythonPython|ThresholdingtechniquesusingOpenCV|Set-1(SimpleThresholding)Python|ThresholdingtechniquesusingOpenCV|Set-2(AdaptiveThresholding)Python|ThresholdingtechniquesusingOpenCV|Set-3(OtsuThresholding)FilterColorwithOpenCVPython|BilateralFilteringPython|BackgroundsubtractionusingOpenCVPython|PlayavideousingOpenCVExtractimagesfromvideoinPythonFaceDetectionusingPythonandOpenCVwithwebcamPythonSeleniumSeleniumPythonTutorialSeleniumBasics–Components,Features,UsesandLimitationsComponentsofSeleniumSeleniumPythonIntroductionandInstallationNavigatinglinksusinggetmethod–SeleniumPythonInteractingwithWebpage–SeleniumPythonLocatingsingleelementsinSeleniumPythonLocatingmultipleelementsinSeleniumPythonLocatorStrategies–SeleniumPythonActionChainsinSeleniumPythonExceptions–SeleniumPythonPythonTkinterPythonTkinterTutorialIntroductiontoTkinterWhatareWidgetsinTkinter?Python|CreatingabuttonintkinterPythonTkinter–LabelRadioButtoninTkinter|PythonPythonTkinter–CheckbuttonWidgetPythonTkinter–CanvasWidgetComboboxWidgetintkinter|PythonPythonTkinter–EntryWidgetPythonTkinter–TextWidgetPythonTkinter–MessagePython|MenuwidgetinTkinterPythonTkinter–SpinBoxProgressbarwidgetinTkinter|PythonPython-TkinterScrollbarPythonTkinter–ScrolledTextWidgetPythonTkinter–ListBoxWidgetPythonTkinter–FrameWidgetPythonTkinter–ScaleWidgetHierarchicaltreeviewinPythonGUIapplicationPython-TkinterTreeviewscrollbarPythonTkinter–ToplevelWidgetPython|askopenfile()functioninTkinterPython|asksaveasfile()functioninTkinterPython–TkinteraskquestionDialogPythonTkinter–MessageBoxWidgetPython|place()methodinTkinterPython|grid()methodinTkinterPython|pack()methodinTkinterPython|PanedWindowWidgetinTkinterPython|BindingfunctioninTkinterPythonTkinter–ValidatingEntryWidgetPythonKivyKivyTutorialIntroductiontoKivy;ACross-platformPythonFrameworkPython|AddLabeltoakivywindowPython|TextinputwidgetinkivyPython|CanvasinkivyPython|CheckboxwidgetinKivyPython|DropdownlistinkivyPython|CarouselWidgetInKivyPython|BoxLayoutwidgetinKivyPython|SliderwidgetinKivyPython|PopupwidgetinKivyPython|SwitchwidgetinKivyPython|SpinnerwidgetinkivyPython|ProgressBarwidgetinkivyPython|WorkingwithbuttonsinKivyPython|FloatLayoutinKivyGridLayoutsinKivy|PythonPython|StackLayoutinKivyPython|AnchorLayoutinKivyPython|RelativeLayoutinKivyPython|PageLayoutinKivyDataVisualizationMatplotlibTutorialPythonSeabornTutorialPythonPlotlytutorialPythonBokehtutorial–InteractiveDataVisualizationwithBokehTableauTutorialPythonExamplesandQuizPythonProgrammingExamplesPythonExercises,PracticeQuestionsandSolutionsPythonMultipleChoiceQuestionsIntroductionPythonProgrammingLanguageIntroductionToPYTHONPythonLanguageadvantagesandapplicationsDownloadandInstallPython3LatestVersionPython3basicsPythonKeywordsNamespacesandScopeinPythonStatement,IndentationandCommentinPythonHowtoassignvaluestovariablesinPythonandotherlanguagesInput/OutputTakinginputinPythonTakinginputfromconsoleinPythonTakingmultipleinputsfromuserinPythonPython|Outputusingprint()functionHowtoprintwithoutnewlineinPython?Pythonendparameterinprint()Python|sepparameterinprint()Python|OutputFormattingOperatorsPythonOperatorsTernaryOperatorinPythonDivisionOperatorsinPythonOperatorOverloadinginPythonAnyAllinPythonOperatorFunctionsinPython|Set1OperatorFunctionsinPython|Set2Differencebetween==andisoperatorinPythonPythonMembershipandIdentityOperatorsDataTypesPython|Set3(Strings,Lists,Tuples,Iterations)PythonStringPythonListsPythonTuplesPythonSetsPythonDictionaryPythonArraysControlFlowControlFlowinPythonChainingcomparisonoperatorsinPythonPythonForLoopsPythonWhileLoopPythonbreakstatementPythonContinueStatementPythonpassStatementLoopingTechniquesinPythonFunctionsPythonFunctions*argsand**kwargsinPythonWhentouseyieldinsteadofreturninPython?GeneratorsinPythonPythonlambdaGlobalandLocalVariablesinPythonGlobalkeywordinPythonFirstClassfunctionsinPythonPythonClosuresDecoratorsinPythonDecoratorswithparametersinPythonMemoizationusingdecoratorsinPythonPythonOOPPythonClassesandObjectsConstructorsinPythonDestructorsinPythonInheritanceinPythonTypesofinheritancePythonEncapsulationinPythonPolymorphisminPythonClassorStaticVariablesinPythonClassmethodvsStaticmethodinPythonExceptionHandlingPythonExceptionHandlingPythonTryExceptErrorsandExceptionsinPythonBuilt-inExceptionsinPythonUser-definedExceptionsinPythonwithExamplesNZECerrorinPythonFilehandlingFileHandlinginPythonOpenaFileinPythonHowtoreadfromafileinPythonWritingtofileinPythonPythonappendtoafilePythonRegexRegularExpressioninPythonwithExamples|Set1RegularExpressionsinPython–Set2(Search,MatchandFindAll)PythonRegex:re.search()VSre.findall()VerboseinPythonRegexPasswordvalidationinPythonPythonCollectionsPythonCollectionsModuleCountersinPython|Set1(InitializationandUpdation)OrderedDictinPythonDefaultdictinPythonChainMapinPythonNamedtupleinPythonDequeinPythonHeapqueue(orheapq)inPythonCollections.UserDictinPythonCollections.UserListinPythonCollections.UserStringinPythonPythonAdvanceOSModuleinPythonwithExamplesFunctionalProgramminginPythonMetaprogrammingwithMetaclassesinPythonAbstractClassesinPythonMultithreadinginPython|Set1MultithreadinginPython|Set2(Synchronization)MultiprocessinginPython|Set1(Introduction)MultiprocessinginPython|Set2(Communicationbetweenprocesses)SocketProgramminginPythonSocketProgrammingwithMulti-threadinginPythonPythonNumPyNumPyTutorialPythonNumpyNumpy|ndarrayNumpy|ArrayCreationNumpy|IndexingBasicSlicingandAdvancedIndexinginNumPyPythonNumpy|DataTypeObjectsNumpy|IteratingOverArrayNumpy|BinaryOperationsNumpy|MathematicalFunctionNumpy|StringOperationsNumpy|LinearAlgebraNumpy|Sorting,SearchingandCountingRandomsamplinginnumpy|randint()functionRandomsamplinginnumpy|random_sample()functionRandomsamplinginnumpy|ranf()functionRandomsamplinginnumpy|random_integers()functionNumpyufunc|UniversalfunctionsPythonPandasPandasTutorialIntroductiontoPandasinPythonHowtoInstallPythonPandasonWindowsandLinux?Python|PandasDataFrameCreatingaPandasDataFramePython|PandasSeriesCreatingaPandasSeriesPython|PandasDataframe/Series.head()methodPython|PandasDataframe.describe()methodDealingwithRowsandColumnsinPandasDataFramePython|PandasExtractingrowsusing.loc[]Python|ExtractingrowsusingPandas.iloc[]IndexingandSelectingDatawithPandasBooleanIndexinginPandasPandasGroupByPython|PandasMerging,Joining,andConcatenatingPython|WorkingwithdateandtimeusingPandasPython|PandasWorkingWithTextDataPython|Readcsvusingpandas.read_csv()Python|WorkingwithPandasandXlsxWriter|Set–1PythonDjangoDjangoTutorialDjangoBasicsDjangoIntroductionandInstallationDjangoProjectMVTStructureHowtoCreateaBasicProjectusingMVTinDjango?HowtoCreateanAppinDjango?DjangoFormsRenderHTMLForms(GET&POST)inDjangoDjangoformfieldcustomwidgetsDjangoModelForm–CreateformfromModelsDjangoFormsetsDjangoModelFormSetsDjangoTemplatesViewsInDjango|PythonDjangoCRUD(Create,Retrieve,Update,Delete)FunctionBasedViewsClassBasedGenericViewsDjango(Create,Retrieve,Update,Delete)DjangoModelsDjangoORM–Inserting,Updating&DeletingDataDjangoBasicAppModel–MakemigrationsandMigratePythonJSONPythonJSONWorkingWithJSONDatainPythonRead,WriteandParseJSONusingPythonAppendtoJSONfileusingPythonSerializingJSONdatainPythonDeserializeJSONtoObjectinPythonPythonCSVWorkingwithcsvfilesinPythonReadingCSVfilesinPythonWritingCSVfilesinPythonPythonMySQLPythonMySQLConnectMySQLdatabaseusingMySQL-ConnectorPythonPythonMySQL–CreateDatabasePython:MySQLCreateTablePythonMySQL–InsertintoTablePythonMySQL–SelectQueryPythonMySQL–WhereClausePythonMySQL–OrderByClausePythonMySQL–DeleteQueryPythonMySQL–DropTablePythonMySQL–UpdateQueryPythonMySQL–LimitClausePythonMySQL–JoinPythonMongoDBPythonMongoDBTutorialInstallingMongoDBonWindowswithPythonMongoDBandPythonCreateadatabaseinMongoDBusingPythonPythonMongoDB–insert_oneQueryPythonMongoDB–insert_manyQueryPythonMongoDB–FindPythonMongoDB–QueryPythonMongoDB–SortMongoDBpython|DeleteDataandDropCollectionPythonMongodb–Delete_one()PythonMongodb–Delete_many()PythonMongoDB–Update_one()PythonMongoDB–Update_manyQueryPythonMongoDB–LimitQueryPythonMongoDB–create_indexQueryPythonMongoDB–drop_indexQueryPythonOpenCVOpenCVPythonTutorialIntroductiontoOpenCVHowtoInstallOpenCVforPythononWindows?ReadinganimageinOpenCVusingPythonOpenCV|SavinganImageArithmeticOperationsonImagesusingOpenCV|Set-1(AdditionandSubtraction)ArithmeticOperationsonImagesusingOpenCV|Set-2(BitwiseOperationsonBinaryImages)ImageResizingusingOpenCV|PythonImageProcessinginPython(Scaling,Rotating,ShiftingandEdgeDetection)Python|ImageblurringusingOpenCVErosionandDilationofimagesusingOpenCVinpythonPython|ThresholdingtechniquesusingOpenCV|Set-1(SimpleThresholding)Python|ThresholdingtechniquesusingOpenCV|Set-2(AdaptiveThresholding)Python|ThresholdingtechniquesusingOpenCV|Set-3(OtsuThresholding)FilterColorwithOpenCVPython|BilateralFilteringPython|BackgroundsubtractionusingOpenCVPython|PlayavideousingOpenCVExtractimagesfromvideoinPythonFaceDetectionusingPythonandOpenCVwithwebcamPythonSeleniumSeleniumPythonTutorialSeleniumBasics–Components,Features,UsesandLimitationsComponentsofSeleniumSeleniumPythonIntroductionandInstallationNavigatinglinksusinggetmethod–SeleniumPythonInteractingwithWebpage–SeleniumPythonLocatingsingleelementsinSeleniumPythonLocatingmultipleelementsinSeleniumPythonLocatorStrategies–SeleniumPythonActionChainsinSeleniumPythonExceptions–SeleniumPythonPythonTkinterPythonTkinterTutorialIntroductiontoTkinterWhatareWidgetsinTkinter?Python|CreatingabuttonintkinterPythonTkinter–LabelRadioButtoninTkinter|PythonPythonTkinter–CheckbuttonWidgetPythonTkinter–CanvasWidgetComboboxWidgetintkinter|PythonPythonTkinter–EntryWidgetPythonTkinter–TextWidgetPythonTkinter–MessagePython|MenuwidgetinTkinterPythonTkinter–SpinBoxProgressbarwidgetinTkinter|PythonPython-TkinterScrollbarPythonTkinter–ScrolledTextWidgetPythonTkinter–ListBoxWidgetPythonTkinter–FrameWidgetPythonTkinter–ScaleWidgetHierarchicaltreeviewinPythonGUIapplicationPython-TkinterTreeviewscrollbarPythonTkinter–ToplevelWidgetPython|askopenfile()functioninTkinterPython|asksaveasfile()functioninTkinterPython–TkinteraskquestionDialogPythonTkinter–MessageBoxWidgetPython|place()methodinTkinterPython|grid()methodinTkinterPython|pack()methodinTkinterPython|PanedWindowWidgetinTkinterPython|BindingfunctioninTkinterPythonTkinter–ValidatingEntryWidgetPythonKivyKivyTutorialIntroductiontoKivy;ACross-platformPythonFrameworkPython|AddLabeltoakivywindowPython|TextinputwidgetinkivyPython|CanvasinkivyPython|CheckboxwidgetinKivyPython|DropdownlistinkivyPython|CarouselWidgetInKivyPython|BoxLayoutwidgetinKivyPython|SliderwidgetinKivyPython|PopupwidgetinKivyPython|SwitchwidgetinKivyPython|SpinnerwidgetinkivyPython|ProgressBarwidgetinkivyPython|WorkingwithbuttonsinKivyPython|FloatLayoutinKivyGridLayoutsinKivy|PythonPython|StackLayoutinKivyPython|AnchorLayoutinKivyPython|RelativeLayoutinKivyPython|PageLayoutinKivyDataVisualizationMatplotlibTutorialPythonSeabornTutorialPythonPlotlytutorialPythonBokehtutorial–InteractiveDataVisualizationwithBokehTableauTutorialPythonExamplesandQuizPythonProgrammingExamplesPythonExercises,PracticeQuestionsandSolutionsPythonMultipleChoiceQuestionsWritingCSVfilesinPythonViewDiscussion ImproveArticle SaveArticle LikeArticle DifficultyLevel: EasyLastUpdated: 29Dec,2019ReadDiscussViewDiscussion ImproveArticle SaveArticle LikeArticle CSV(CommaSeparatedValues)isasimplefileformatusedtostoretabulardata,suchasaspreadsheetordatabase.CSVfilestorestabulardata(numbersandtext)inplaintext.Eachlineofthefileisadatarecord.Eachrecordconsistsofoneormorefields,separatedbycommas.Theuseofthecommaasafieldseparatoristhesourceofthenameforthisfileformat.Pythonprovidesanin-builtmodulecalledcsvtoworkwithCSVfiles.TherearevariousclassesprovidedbythismoduleforwritingtoCSV:Usingcsv.writerclassUsingcsv.DictWriterclassUsingcsv.writerclasscsv.writerclassisusedtoinsertdatatotheCSVfile.Thisclassreturnsawriterobjectwhichisresponsibleforconvertingtheuser’sdataintoadelimitedstring.Acsvfileobjectshouldbeopenedwithnewline=''otherwisenewlinecharactersinsidethequotedfieldswillnotbeinterpretedcorrectly.Syntax:csv.writer(csvfile,dialect=’excel’,**fmtparams)Parameters:csvfile:Afileobjectwithwrite()method.dialect(optional):Nameofthedialecttobeused.fmtparams(optional):Formattingparametersthatwilloverwritethosespecifiedinthedialect.csv.writerclassprovidestwomethodsforwritingtoCSV.Theyarewriterow()andwriterows().writerow():Thismethodwritesasinglerowatatime.Fieldrowcanbewrittenusingthismethod.Syntax: writerow(fields) writerows():Thismethodisusedtowritemultiplerowsatatime.Thiscanbeusedtowriterowslist.Syntax:WritingCSVfilesinPython writerows(rows) Example:#Pythonprogramtodemonstrate#writingtoCSV    importcsv     #fieldnames fields=['Name','Branch','Year','CGPA']     #datarowsofcsvfile rows=[['Nikhil','COE','2','9.0'],          ['Sanchit','COE','2','9.1'],          ['Aditya','IT','2','9.3'],          ['Sagar','SE','1','9.5'],          ['Prateek','MCE','3','7.8'],          ['Sahil','EP','2','9.1']]     #nameofcsvfile filename="university_records.csv"    #writingtocsvfile withopen(filename,'w')ascsvfile:     #creatingacsvwriterobject     csvwriter=csv.writer(csvfile)             #writingthefields     csvwriter.writerow(fields)             #writingthedatarows     csvwriter.writerows(rows)Output:Usingcsv.DictWriterclassThisclassreturnsawriterobjectwhichmapsdictionariesontooutputrows.Syntax:csv.DictWriter(csvfile,fieldnames,restval=”,extrasaction=’raise’,dialect=’excel’,*args,**kwds)Parameters:csvfile:Afileobjectwithwrite()method.fieldnames:Asequenceofkeysthatidentifytheorderinwhichvaluesinthedictionaryshouldbepassed.restval(optional):Specifiesthevaluetobewrittenifthedictionaryismissingakeyinfieldnames.extrasaction(optional):Ifakeynotfoundinfieldnames,theoptionalextrasactionparameterindicateswhatactiontotake.IfitissettoraiseaValueErrorwillberaised.dialect(optional):Nameofthedialecttobeused.csv.DictWriterprovidestwomethodsforwritingtoCSV.Theyare:writeheader():writeheader()methodsimplywritesthefirstrowofyourcsvfileusingthepre-specifiedfieldnames.Syntax: writeheader() writerows():writerowsmethodsimplywritesalltherowsbutineachrow,itwritesonlythevalues(notkeys).Syntax: writerows(mydict) Example:#importingthecsvmodule importcsv     #mydatarowsasdictionaryobjects mydict=[{'branch':'COE','cgpa':'9.0','name':'Nikhil','year':'2'},          {'branch':'COE','cgpa':'9.1','name':'Sanchit','year':'2'},          {'branch':'IT','cgpa':'9.3','name':'Aditya','year':'2'},          {'branch':'SE','cgpa':'9.5','name':'Sagar','year':'1'},          {'branch':'MCE','cgpa':'7.8','name':'Prateek','year':'3'},          {'branch':'EP','cgpa':'9.1','name':'Sahil','year':'2'}]     #fieldnames fields=['name','branch','year','cgpa']     #nameofcsvfile filename="university_records.csv"    #writingtocsvfile withopen(filename,'w')ascsvfile:     #creatingacsvdictwriterobject     writer=csv.DictWriter(csvfile,fieldnames=fields)             #writingheaders(fieldnames)     writer.writeheader()             #writingdatarows     writer.writerows(mydict) Output:MyPersonalNotes arrow_drop_upSave LikePreviousReadingCSVfilesinPythonNext PythonMySQLRecommendedArticlesPage:20,Jun2006,May2120,Mar2022,Jan2028,Feb1801,Feb2103,Apr1728,Apr2016,Dec1905,Oct2013,Jan2123,Feb2101,Apr2113,May2125,Mar2109,Dec1601,Jul2001,Jul2002,Dec2016,Apr2106,May2119,Sep2116,Dec2127,May21ArticleContributedBy:nikhilaggarwal3@nikhilaggarwal3VotefordifficultyCurrentdifficulty: EasyEasy Normal Medium Hard ExpertArticleTags:Pickedpython-csvPythonPracticeTags:pythonReportIssueWritingcodeincomment? Pleaseuseide.geeksforgeeks.org, generatelinkandsharethelinkhere. LoadCommentsPleaseLogintocomment...What'sNewViewDetailsViewDetailsViewDetailsImproveyourCodingSkillswithPracticeTryIt! Weusecookiestoensureyouhavethebestbrowsingexperienceonourwebsite.Byusingoursite,you acknowledgethatyouhavereadandunderstoodour CookiePolicy& PrivacyPolicy GotIt! StartYourCodingJourneyNow!Login Register