How to use New method of csv Package

Best K6 code snippet using csv.New

reader_test.go

Source:reader_test.go Github

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...24 "github.com/apache/arrow/go/v9/arrow/csv"25 "github.com/apache/arrow/go/v9/arrow/memory"26)27func Example() {28 f := bytes.NewBufferString(`## a simple set of data: int64;float64;string290;0;str-0301;1;str-1312;2;str-2323;3;str-3334;4;str-4345;5;str-5356;6;str-6367;7;str-7378;8;str-8389;9;str-939`)40 schema := arrow.NewSchema(41 []arrow.Field{42 {Name: "i64", Type: arrow.PrimitiveTypes.Int64},43 {Name: "f64", Type: arrow.PrimitiveTypes.Float64},44 {Name: "str", Type: arrow.BinaryTypes.String},45 },46 nil,47 )48 r := csv.NewReader(f, schema, csv.WithComment('#'), csv.WithComma(';'))49 defer r.Release()50 n := 051 for r.Next() {52 rec := r.Record()53 for i, col := range rec.Columns() {54 fmt.Printf("rec[%d][%q]: %v\n", n, rec.ColumnName(i), col)55 }56 n++57 }58 // check for reader errors indicating issues converting csv values59 // to the arrow schema types60 err := r.Err()61 if err != nil {62 log.Fatal(err)63 }64 // Output:65 // rec[0]["i64"]: [0]66 // rec[0]["f64"]: [0]67 // rec[0]["str"]: ["str-0"]68 // rec[1]["i64"]: [1]69 // rec[1]["f64"]: [1]70 // rec[1]["str"]: ["str-1"]71 // rec[2]["i64"]: [2]72 // rec[2]["f64"]: [2]73 // rec[2]["str"]: ["str-2"]74 // rec[3]["i64"]: [3]75 // rec[3]["f64"]: [3]76 // rec[3]["str"]: ["str-3"]77 // rec[4]["i64"]: [4]78 // rec[4]["f64"]: [4]79 // rec[4]["str"]: ["str-4"]80 // rec[5]["i64"]: [5]81 // rec[5]["f64"]: [5]82 // rec[5]["str"]: ["str-5"]83 // rec[6]["i64"]: [6]84 // rec[6]["f64"]: [6]85 // rec[6]["str"]: ["str-6"]86 // rec[7]["i64"]: [7]87 // rec[7]["f64"]: [7]88 // rec[7]["str"]: ["str-7"]89 // rec[8]["i64"]: [8]90 // rec[8]["f64"]: [8]91 // rec[8]["str"]: ["str-8"]92 // rec[9]["i64"]: [9]93 // rec[9]["f64"]: [9]94 // rec[9]["str"]: ["str-9"]95}96func Example_withChunk() {97 f := bytes.NewBufferString(`## a simple set of data: int64;float64;string980;0;str-0991;1;str-11002;2;str-21013;3;str-31024;4;str-41035;5;str-51046;6;str-61057;7;str-71068;8;str-81079;9;str-9108`)109 schema := arrow.NewSchema(110 []arrow.Field{111 {Name: "i64", Type: arrow.PrimitiveTypes.Int64},112 {Name: "f64", Type: arrow.PrimitiveTypes.Float64},113 {Name: "str", Type: arrow.BinaryTypes.String},114 },115 nil,116 )117 r := csv.NewReader(118 f, schema,119 csv.WithComment('#'), csv.WithComma(';'),120 csv.WithChunk(3),121 )122 defer r.Release()123 n := 0124 for r.Next() {125 rec := r.Record()126 for i, col := range rec.Columns() {127 fmt.Printf("rec[%d][%q]: %v\n", n, rec.ColumnName(i), col)128 }129 n++130 }131 // Output:132 // rec[0]["i64"]: [0 1 2]133 // rec[0]["f64"]: [0 1 2]134 // rec[0]["str"]: ["str-0" "str-1" "str-2"]135 // rec[1]["i64"]: [3 4 5]136 // rec[1]["f64"]: [3 4 5]137 // rec[1]["str"]: ["str-3" "str-4" "str-5"]138 // rec[2]["i64"]: [6 7 8]139 // rec[2]["f64"]: [6 7 8]140 // rec[2]["str"]: ["str-6" "str-7" "str-8"]141 // rec[3]["i64"]: [9]142 // rec[3]["f64"]: [9]143 // rec[3]["str"]: ["str-9"]144}145func TestCSVReader(t *testing.T) {146 tests := []struct {147 Name string148 File string149 Header bool150 }{{151 Name: "NoHeader",152 File: "testdata/types.csv",153 Header: false,154 }, {155 Name: "Header",156 File: "testdata/header.csv",157 Header: true,158 }}159 for _, test := range tests {160 t.Run(test.Name, func(t *testing.T) {161 testCSVReader(t, test.File, test.Header)162 })163 }164}165var defaultNullValues = []string{"", "NULL", "null", "N/A"}166func testCSVReader(t *testing.T, filepath string, withHeader bool) {167 mem := memory.NewCheckedAllocator(memory.NewGoAllocator())168 defer mem.AssertSize(t, 0)169 raw, err := ioutil.ReadFile(filepath)170 if err != nil {171 t.Fatal(err)172 }173 schema := arrow.NewSchema(174 []arrow.Field{175 arrow.Field{Name: "bool", Type: arrow.FixedWidthTypes.Boolean},176 arrow.Field{Name: "i8", Type: arrow.PrimitiveTypes.Int8},177 arrow.Field{Name: "i16", Type: arrow.PrimitiveTypes.Int16},178 arrow.Field{Name: "i32", Type: arrow.PrimitiveTypes.Int32},179 arrow.Field{Name: "i64", Type: arrow.PrimitiveTypes.Int64},180 arrow.Field{Name: "u8", Type: arrow.PrimitiveTypes.Uint8},181 arrow.Field{Name: "u16", Type: arrow.PrimitiveTypes.Uint16},182 arrow.Field{Name: "u32", Type: arrow.PrimitiveTypes.Uint32},183 arrow.Field{Name: "u64", Type: arrow.PrimitiveTypes.Uint64},184 arrow.Field{Name: "f32", Type: arrow.PrimitiveTypes.Float32},185 arrow.Field{Name: "f64", Type: arrow.PrimitiveTypes.Float64},186 arrow.Field{Name: "str", Type: arrow.BinaryTypes.String},187 arrow.Field{Name: "ts", Type: arrow.FixedWidthTypes.Timestamp_ms},188 },189 nil,190 )191 r := csv.NewReader(bytes.NewReader(raw), schema,192 csv.WithAllocator(mem),193 csv.WithComment('#'), csv.WithComma(';'),194 csv.WithHeader(withHeader),195 csv.WithNullReader(true, defaultNullValues...),196 )197 defer r.Release()198 r.Retain()199 r.Release()200 if got, want := r.Schema(), schema; !got.Equal(want) {201 t.Fatalf("invalid schema: got=%v, want=%v", got, want)202 }203 out := new(bytes.Buffer)204 n := 0205 for r.Next() {206 rec := r.Record()207 for i, col := range rec.Columns() {208 fmt.Fprintf(out, "rec[%d][%q]: %v\n", n, rec.ColumnName(i), col)209 }210 n++211 }212 if got, want := n, 3; got != want {213 t.Fatalf("invalid number of rows: got=%d, want=%d", got, want)214 }215 want := `rec[0]["bool"]: [true]216rec[0]["i8"]: [-1]217rec[0]["i16"]: [-1]218rec[0]["i32"]: [-1]219rec[0]["i64"]: [-1]220rec[0]["u8"]: [1]221rec[0]["u16"]: [1]222rec[0]["u32"]: [1]223rec[0]["u64"]: [1]224rec[0]["f32"]: [1.1]225rec[0]["f64"]: [1.1]226rec[0]["str"]: ["str-1"]227rec[0]["ts"]: [1652054461000]228rec[1]["bool"]: [false]229rec[1]["i8"]: [-2]230rec[1]["i16"]: [-2]231rec[1]["i32"]: [-2]232rec[1]["i64"]: [-2]233rec[1]["u8"]: [2]234rec[1]["u16"]: [2]235rec[1]["u32"]: [2]236rec[1]["u64"]: [2]237rec[1]["f32"]: [2.2]238rec[1]["f64"]: [2.2]239rec[1]["str"]: ["str-2"]240rec[1]["ts"]: [1652140799000]241rec[2]["bool"]: [(null)]242rec[2]["i8"]: [(null)]243rec[2]["i16"]: [(null)]244rec[2]["i32"]: [(null)]245rec[2]["i64"]: [(null)]246rec[2]["u8"]: [(null)]247rec[2]["u16"]: [(null)]248rec[2]["u32"]: [(null)]249rec[2]["u64"]: [(null)]250rec[2]["f32"]: [(null)]251rec[2]["f64"]: [(null)]252rec[2]["str"]: [(null)]253rec[2]["ts"]: [(null)]254`255 if got, want := out.String(), want; got != want {256 t.Fatalf("invalid output:\ngot= %s\nwant=%s\n", got, want)257 }258 if r.Err() != nil {259 t.Fatalf("unexpected error: %v", r.Err())260 }261 // test error modes262 {263 r := csv.NewReader(bytes.NewReader(raw), schema,264 csv.WithAllocator(mem),265 csv.WithComment('#'), csv.WithComma(';'),266 csv.WithHeader(withHeader),267 csv.WithNullReader(true),268 )269 r.Next()270 r.Record()271 r.Release()272 }273}274func TestCSVReaderWithChunk(t *testing.T) {275 mem := memory.NewCheckedAllocator(memory.NewGoAllocator())276 defer mem.AssertSize(t, 0)277 raw, err := ioutil.ReadFile("testdata/simple.csv")278 if err != nil {279 t.Fatal(err)280 }281 schema := arrow.NewSchema(282 []arrow.Field{283 arrow.Field{Name: "i64", Type: arrow.PrimitiveTypes.Int64},284 arrow.Field{Name: "f64", Type: arrow.PrimitiveTypes.Float64},285 arrow.Field{Name: "str", Type: arrow.BinaryTypes.String},286 },287 nil,288 )289 for _, tc := range []struct {290 name string291 opts []csv.Option292 records int293 want string294 }{295 {296 name: "chunk=default",297 opts: []csv.Option{csv.WithAllocator(mem), csv.WithComment('#'), csv.WithComma(';')},298 records: 10,299 want: `rec[0]["i64"]: [0]300rec[0]["f64"]: [0]301rec[0]["str"]: ["str-0"]302rec[1]["i64"]: [1]303rec[1]["f64"]: [1]304rec[1]["str"]: ["str-1"]305rec[2]["i64"]: [2]306rec[2]["f64"]: [2]307rec[2]["str"]: ["str-2"]308rec[3]["i64"]: [3]309rec[3]["f64"]: [3]310rec[3]["str"]: ["str-3"]311rec[4]["i64"]: [4]312rec[4]["f64"]: [4]313rec[4]["str"]: ["str-4"]314rec[5]["i64"]: [5]315rec[5]["f64"]: [5]316rec[5]["str"]: ["str-5"]317rec[6]["i64"]: [6]318rec[6]["f64"]: [6]319rec[6]["str"]: ["str-6"]320rec[7]["i64"]: [7]321rec[7]["f64"]: [7]322rec[7]["str"]: ["str-7"]323rec[8]["i64"]: [8]324rec[8]["f64"]: [8]325rec[8]["str"]: ["str-8"]326rec[9]["i64"]: [9]327rec[9]["f64"]: [9]328rec[9]["str"]: ["str-9"]329`,330 },331 {332 name: "chunk=0",333 opts: []csv.Option{334 csv.WithAllocator(mem), csv.WithComment('#'), csv.WithComma(';'),335 csv.WithChunk(0),336 },337 records: 10,338 want: `rec[0]["i64"]: [0]339rec[0]["f64"]: [0]340rec[0]["str"]: ["str-0"]341rec[1]["i64"]: [1]342rec[1]["f64"]: [1]343rec[1]["str"]: ["str-1"]344rec[2]["i64"]: [2]345rec[2]["f64"]: [2]346rec[2]["str"]: ["str-2"]347rec[3]["i64"]: [3]348rec[3]["f64"]: [3]349rec[3]["str"]: ["str-3"]350rec[4]["i64"]: [4]351rec[4]["f64"]: [4]352rec[4]["str"]: ["str-4"]353rec[5]["i64"]: [5]354rec[5]["f64"]: [5]355rec[5]["str"]: ["str-5"]356rec[6]["i64"]: [6]357rec[6]["f64"]: [6]358rec[6]["str"]: ["str-6"]359rec[7]["i64"]: [7]360rec[7]["f64"]: [7]361rec[7]["str"]: ["str-7"]362rec[8]["i64"]: [8]363rec[8]["f64"]: [8]364rec[8]["str"]: ["str-8"]365rec[9]["i64"]: [9]366rec[9]["f64"]: [9]367rec[9]["str"]: ["str-9"]368`,369 },370 {371 name: "chunk=1",372 opts: []csv.Option{373 csv.WithAllocator(mem), csv.WithComment('#'), csv.WithComma(';'),374 csv.WithChunk(1),375 },376 records: 10,377 want: `rec[0]["i64"]: [0]378rec[0]["f64"]: [0]379rec[0]["str"]: ["str-0"]380rec[1]["i64"]: [1]381rec[1]["f64"]: [1]382rec[1]["str"]: ["str-1"]383rec[2]["i64"]: [2]384rec[2]["f64"]: [2]385rec[2]["str"]: ["str-2"]386rec[3]["i64"]: [3]387rec[3]["f64"]: [3]388rec[3]["str"]: ["str-3"]389rec[4]["i64"]: [4]390rec[4]["f64"]: [4]391rec[4]["str"]: ["str-4"]392rec[5]["i64"]: [5]393rec[5]["f64"]: [5]394rec[5]["str"]: ["str-5"]395rec[6]["i64"]: [6]396rec[6]["f64"]: [6]397rec[6]["str"]: ["str-6"]398rec[7]["i64"]: [7]399rec[7]["f64"]: [7]400rec[7]["str"]: ["str-7"]401rec[8]["i64"]: [8]402rec[8]["f64"]: [8]403rec[8]["str"]: ["str-8"]404rec[9]["i64"]: [9]405rec[9]["f64"]: [9]406rec[9]["str"]: ["str-9"]407`,408 },409 {410 name: "chunk=3",411 opts: []csv.Option{412 csv.WithAllocator(mem), csv.WithComment('#'), csv.WithComma(';'),413 csv.WithChunk(3),414 },415 records: 4,416 want: `rec[0]["i64"]: [0 1 2]417rec[0]["f64"]: [0 1 2]418rec[0]["str"]: ["str-0" "str-1" "str-2"]419rec[1]["i64"]: [3 4 5]420rec[1]["f64"]: [3 4 5]421rec[1]["str"]: ["str-3" "str-4" "str-5"]422rec[2]["i64"]: [6 7 8]423rec[2]["f64"]: [6 7 8]424rec[2]["str"]: ["str-6" "str-7" "str-8"]425rec[3]["i64"]: [9]426rec[3]["f64"]: [9]427rec[3]["str"]: ["str-9"]428`,429 },430 {431 name: "chunk=6",432 opts: []csv.Option{433 csv.WithAllocator(mem), csv.WithComment('#'), csv.WithComma(';'),434 csv.WithChunk(6),435 },436 records: 2,437 want: `rec[0]["i64"]: [0 1 2 3 4 5]438rec[0]["f64"]: [0 1 2 3 4 5]439rec[0]["str"]: ["str-0" "str-1" "str-2" "str-3" "str-4" "str-5"]440rec[1]["i64"]: [6 7 8 9]441rec[1]["f64"]: [6 7 8 9]442rec[1]["str"]: ["str-6" "str-7" "str-8" "str-9"]443`,444 },445 {446 name: "chunk=10",447 opts: []csv.Option{448 csv.WithAllocator(mem), csv.WithComment('#'), csv.WithComma(';'),449 csv.WithChunk(10),450 },451 records: 1,452 want: `rec[0]["i64"]: [0 1 2 3 4 5 6 7 8 9]453rec[0]["f64"]: [0 1 2 3 4 5 6 7 8 9]454rec[0]["str"]: ["str-0" "str-1" "str-2" "str-3" "str-4" "str-5" "str-6" "str-7" "str-8" "str-9"]455`,456 },457 {458 name: "chunk=11",459 opts: []csv.Option{460 csv.WithAllocator(mem), csv.WithComment('#'), csv.WithComma(';'),461 csv.WithChunk(11),462 },463 records: 1,464 want: `rec[0]["i64"]: [0 1 2 3 4 5 6 7 8 9]465rec[0]["f64"]: [0 1 2 3 4 5 6 7 8 9]466rec[0]["str"]: ["str-0" "str-1" "str-2" "str-3" "str-4" "str-5" "str-6" "str-7" "str-8" "str-9"]467`,468 },469 {470 name: "chunk=-1",471 opts: []csv.Option{472 csv.WithAllocator(mem), csv.WithComment('#'), csv.WithComma(';'),473 csv.WithChunk(-1),474 },475 records: 1,476 want: `rec[0]["i64"]: [0 1 2 3 4 5 6 7 8 9]477rec[0]["f64"]: [0 1 2 3 4 5 6 7 8 9]478rec[0]["str"]: ["str-0" "str-1" "str-2" "str-3" "str-4" "str-5" "str-6" "str-7" "str-8" "str-9"]479`,480 },481 } {482 t.Run(tc.name, func(t *testing.T) {483 r := csv.NewReader(bytes.NewReader(raw), schema, tc.opts...)484 defer r.Release()485 r.Retain()486 r.Release()487 if got, want := r.Schema(), schema; !got.Equal(want) {488 t.Fatalf("invalid schema: got=%v, want=%v", got, want)489 }490 out := new(bytes.Buffer)491 n := 0492 for r.Next() {493 rec := r.Record()494 for i, col := range rec.Columns() {495 fmt.Fprintf(out, "rec[%d][%q]: %v\n", n, rec.ColumnName(i), col)496 }497 n++498 }499 if got, want := n, tc.records; got != want {500 t.Fatalf("invalid number of records: got=%d, want=%d", got, want)501 }502 if got, want := out.String(), tc.want; got != want {503 t.Fatalf("invalid output:\ngot:\n%s\nwant:\n%s\n", got, want)504 }505 if r.Err() != nil {506 t.Fatalf("unexpected error: %v", r.Err())507 }508 })509 }510}511func BenchmarkRead(b *testing.B) {512 gen := func(rows, cols int) []byte {513 buf := new(bytes.Buffer)514 for i := 0; i < rows; i++ {515 for j := 0; j < cols; j++ {516 if j > 0 {517 fmt.Fprintf(buf, ";")518 }519 fmt.Fprintf(buf, "%d;%f;str-%d", i, float64(i), i)520 }521 fmt.Fprintf(buf, "\n")522 }523 return buf.Bytes()524 }525 for _, rows := range []int{10, 1e2, 1e3, 1e4, 1e5} {526 for _, cols := range []int{1, 10, 100, 1000} {527 raw := gen(rows, cols)528 for _, chunks := range []int{-1, 0, 10, 100, 1000} {529 b.Run(fmt.Sprintf("rows=%d cols=%d chunks=%d", rows, cols, chunks), func(b *testing.B) {530 benchRead(b, raw, rows, cols, chunks)531 })532 }533 }534 }535}536func benchRead(b *testing.B, raw []byte, rows, cols, chunks int) {537 mem := memory.NewCheckedAllocator(memory.NewGoAllocator())538 defer mem.AssertSize(b, 0)539 var fields []arrow.Field540 for i := 0; i < cols; i++ {541 fields = append(fields, []arrow.Field{542 arrow.Field{Name: fmt.Sprintf("i64-%d", i), Type: arrow.PrimitiveTypes.Int64},543 arrow.Field{Name: fmt.Sprintf("f64-%d", i), Type: arrow.PrimitiveTypes.Float64},544 arrow.Field{Name: fmt.Sprintf("str-%d", i), Type: arrow.BinaryTypes.String},545 }...)546 }547 schema := arrow.NewSchema(fields, nil)548 chunk := 0549 if chunks != 0 {550 chunk = rows / chunks551 }552 opts := []csv.Option{553 csv.WithAllocator(mem), csv.WithComment('#'), csv.WithComma(';'),554 csv.WithChunk(chunk),555 }556 b.ResetTimer()557 for i := 0; i < b.N; i++ {558 r := csv.NewReader(bytes.NewReader(raw), schema, opts...)559 n := int64(0)560 for r.Next() {561 n += r.Record().NumRows()562 }563 r.Release()564 if n != int64(rows) {565 b.Fatalf("invalid number of rows. want=%d, got=%d", n, rows)566 }567 }568}...

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readCsv.go

Source:readCsv.go Github

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...63 log.Fatalf("can not open the file, err is %+v", err)64 fmt.Printf("can not open the file, err is %+v", err)65 }66 defer fs.Close()67 r := csv.NewReader(fs)68 //针对大文件,一行一行的读取文件69 for {70 row, err := r.Read()71 if err != nil && err != io.EOF {72 log.Fatalf("can not read, err is %+v", err)73 fmt.Printf("can not read, err is %+v", err)74 }75 if err == io.EOF {76 break77 }78 fmt.Println(row)79 }80 //针对小文件,也可以一次性读取所有的文件81 //注意,r要重新赋值,因为readall是读取剩下的82 fs1, _ := os.Open(fileName)83 r1 := csv.NewReader(fs1)84 content, err := r1.ReadAll()85 if err != nil {86 log.Fatalf("can not readall, err is %+v", err)87 fmt.Printf("can not readall, err is %+v", err)88 }89 for _, row := range content {90 fmt.Println(row)91 }92 //创建一个新文件93 newFileName := outPath94 //这样打开,每次都会清空文件内容95 //nfs, err := os.Create(newFileName)96 //这样可以追加写97 nfs, err := os.OpenFile(newFileName, os.O_RDWR|os.O_CREATE, 0666)98 if err != nil {99 log.Fatalf("can not create file, err is %+v", err)100 fmt.Printf("can not create file, err is %+v", err)101 }102 defer nfs.Close()103 nfs.Seek(0, io.SeekEnd)104 w := csv.NewWriter(nfs)105 //设置属性106 w.Comma = ','107 w.UseCRLF = true108 row := []string{"1", "2", "3", "4", "5,6"}109 err = w.Write(row)110 if err != nil {111 log.Fatalf("can not write, err is %+v", err)112 fmt.Printf("can not write, err is %+v", err)113 }114 //这里必须刷新,才能将数据写入文件。115 w.Flush()116 //一次写入多行117 var newContent [][]string118 newContent = append(newContent, []string{"1", "2", "3", "4", "5", "6"})...

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record.go

Source:record.go Github

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...81 return other82}83// WriteCSV - encodes to CSV data.84func (r *Record) WriteCSV(writer io.Writer, opts sql.WriteCSVOpts) error {85 w := csv.NewWriter(writer)86 w.Comma = opts.FieldDelimiter87 w.AlwaysQuote = opts.AlwaysQuote88 w.Quote = opts.Quote89 w.QuoteEscape = opts.QuoteEscape90 if err := w.Write(r.csvRecord); err != nil {91 return err92 }93 w.Flush()94 if err := w.Error(); err != nil {95 return err96 }97 return nil98}99// WriteJSON - encodes to JSON data.100func (r *Record) WriteJSON(writer io.Writer) error {101 var kvs jstream.KVS = make([]jstream.KV, len(r.columnNames))102 for i := 0; i < len(r.columnNames); i++ {103 kvs[i] = jstream.KV{Key: r.columnNames[i], Value: r.csvRecord[i]}104 }105 return json.NewEncoder(writer).Encode(kvs)106}107// Raw - returns the underlying data with format info.108func (r *Record) Raw() (sql.SelectObjectFormat, interface{}) {109 return sql.SelectFmtCSV, r110}111// Replace - is not supported for CSV112func (r *Record) Replace(_ interface{}) error {113 return errors.New("Replace is not supported for CSV")114}115// NewRecord - creates new CSV record.116func NewRecord() *Record {117 return &Record{}118}...

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1import (2func main() {3 file, err := os.Open("file.csv")4 if err != nil {5 panic(err)6 }7 defer file.Close()8 reader := csv.NewReader(file)9 reader.Comma = ';'10 rawCSVdata, err := reader.ReadAll()11 if err != nil {12 panic(err)13 }14 for _, record := range rawCSVdata {15 for _, item := range record {16 print(item + " ")17 }18 println()19 }20}

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1import (2func main() {3 file, err := os.Open("data.csv")4 if err != nil {5 fmt.Println(err)6 }7 defer file.Close()8 reader := csv.NewReader(file)9 rows, err := reader.ReadAll()10 if err != nil {11 fmt.Println(err)12 }13 for _, row := range rows {14 fmt.Println(row)15 }16}17import (18func main() {19 file, err := os.Open("data.csv")20 if err != nil {21 fmt.Println(err)22 }23 defer file.Close()24 reader := csv.NewReader(file)25 for {26 row, err := reader.Read()27 if err != nil {28 fmt.Println(err)29 }30 fmt.Println(row)31 }32}33import (34func main() {35 file, err := os.Open("data.csv")36 if err != nil {37 fmt.Println(err)38 }39 defer file.Close()40 reader := csv.NewReader(file)41 rows, err := reader.ReadAll()42 if err != nil {43 fmt.Println(err)44 }45 for _, row := range rows {46 fmt.Println(row)47 }48}

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1import (2func main() {3 file, err := os.Open("data.csv")4 if err != nil {5 fmt.Println(err)6 }7 defer file.Close()8 reader := csv.NewReader(file)9 rawCSVdata, err := reader.ReadAll()10 if err != nil {11 fmt.Println(err)12 os.Exit(1)13 }14 fmt.Println(rawCSVdata)15}16import (17func main() {18 file, err := os.Open("data.csv")19 if err != nil {20 fmt.Println(err)21 }22 defer file.Close()23 reader := csv.NewReader(file)24 rawCSVdata, err := reader.ReadAll()25 if err != nil {26 fmt.Println(err)27 os.Exit(1)28 }29 fmt.Println(rawCSVdata)30}31import (32func main() {33 file, err := os.Open("data.csv")34 if err != nil {35 fmt.Println(err)36 }37 defer file.Close()38 reader := csv.NewReader(file)39 rawCSVdata, err := reader.ReadAll()40 if err != nil {41 fmt.Println(err)42 os.Exit(1)43 }44 fmt.Println(rawCSVdata)45}46import (47func main() {48 file, err := os.Open("data

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1import (2func main() {3 csvFile, err := os.Create("test.csv")4 if err != nil {5 fmt.Println(err)6 }7 csvWriter := csv.NewWriter(csvFile)8 csvWriter.Write([]string{"Name", "Age"})9 csvWriter.Write([]string{"Ram", "25"})10 csvWriter.Write([]string{"Shyam", "26"})11 csvWriter.Write([]string{"Hari", "27"})12 csvWriter.Write([]string{"Sita", "28"})13 csvWriter.Flush()14 csvFile.Close()15}16import (17func main() {18 csvFile, err := os.Open("test.csv")19 if err != nil {20 fmt.Println(err)21 }22 csvReader := csv.NewReader(csvFile)23 lines, err := csvReader.ReadAll()24 if err != nil {25 fmt.Println(err)26 }27 for _, line := range lines {28 fmt.Println(line)29 }30}31import (32func main() {33 csvFile, err := os.Open("test.csv")34 if err != nil {35 fmt.Println(err)36 }37 csvReader := csv.NewReader(csvFile)

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1import (2func main() {3 f, err := os.Create("test.csv")4 if err != nil {5 fmt.Println(err)6 }7 writer := csv.NewWriter(f)8 writer.Write([]string{"Name", "Class", "Marks"})9 writer.Write([]string{"Ram", "10", "90"})10 writer.Write([]string{"Shyam", "10", "80"})11 writer.Write([]string{"Ravi", "10", "70"})12 writer.Write([]string{"Raj", "10", "60"})13 writer.Write([]string{"Rahul", "10", "50"})14 writer.Flush()15 f.Close()16}17import (18func main() {19 f, err := os.Open("test.csv")20 if err != nil {21 fmt.Println(err)22 }23 reader := csv.NewReader(f)24 data, err := reader.ReadAll()25 if err != nil {26 fmt.Println(err)27 }28 for _, row := range data {29 fmt.Println(row)30 }31}32import (

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1import (2func main() {3 f, err := os.Open("data.csv")4 if err != nil {5 log.Fatal(err)6 }7 defer f.Close()8 r := csv.NewReader(f)9 records, err := r.ReadAll()10 if err != nil {11 log.Fatal(err)12 }13 for _, record := range records {14 fmt.Println(record)15 }16}

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1import (2func main() {3 csvFile, _ := os.Open("test.csv")4 reader := csv.NewReader(csvFile)5 csvData, _ := reader.ReadAll()6 for _, each := range csvData {7 fmt.Println(each)8 }9}10import (11func main() {12 csvFile, _ := os.Open("test.csv")13 reader := csv.NewReader(csvFile)14 csvData, _ := reader.ReadAll()15 for _, each := range csvData {16 fmt.Println(each)17 }18}19import (20func main() {21 csvFile, _ := os.Open("test.csv")22 reader := csv.NewReader(csvFile)23 csvData, _ := reader.ReadAll()24 for _, each := range csvData {25 fmt.Println(each)26 }27}28import (29func main() {30 csvFile, _ := os.Open("test.csv")31 reader := csv.NewReader(csvFile)32 csvData, _ := reader.ReadAll()33 for _, each := range csvData {34 fmt.Println(each)35 }36}37import (38func main() {39 csvFile, _ := os.Open("test.csv")40 reader := csv.NewReader(csvFile)

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