Resolve #580, revert commit https://github.com/360EntSecGroup-Skylar/excelize/commit/5ca7231ed408ac264f509ff52b5d28ff4fbda757

16 files changed, 137 insertions, 102 deletions

diff --git a/README.md b/README.md
index d7f696c..c81efd1 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,11 @@ Here is a minimal example usage that will create XLSX file.
 ```go
 package main
 
-import "github.com/360EntSecGroup-Skylar/excelize"
+import (
+    "fmt"
+
+    "github.com/360EntSecGroup-Skylar/excelize"
+)
 
 func main() {
     f := excelize.NewFile()
@@ -44,7 +48,7 @@ func main() {
     f.SetActiveSheet(index)
     // Save xlsx file by the given path.
     if err := f.SaveAs("Book1.xlsx"); err != nil {
-        println(err.Error())
+        fmt.Println(err)
     }
 }
 ```
@@ -56,28 +60,32 @@ The following constitutes the bare to read a XLSX document.
 ```go
 package main
 
-import "github.com/360EntSecGroup-Skylar/excelize"
+import (
+    "fmt"
+
+    "github.com/360EntSecGroup-Skylar/excelize"
+)
 
 func main() {
     f, err := excelize.OpenFile("Book1.xlsx")
     if err != nil {
-        println(err.Error())
+        fmt.Println(err)
         return
     }
     // Get value from cell by given worksheet name and axis.
     cell, err := f.GetCellValue("Sheet1", "B2")
     if err != nil {
-        println(err.Error())
+        fmt.Println(err)
         return
     }
-    println(cell)
+    fmt.Println(cell)
     // Get all the rows in the Sheet1.
     rows, err := f.GetRows("Sheet1")
     for _, row := range rows {
         for _, colCell := range row {
-            print(colCell, "\t")
+            fmt.Print(colCell, "\t")
         }
-        println()
+        fmt.Println()
     }
 }
 ```
@@ -91,7 +99,11 @@ With Excelize chart generation and management is as easy as a few lines of code.
 ```go
 package main
 
-import "github.com/360EntSecGroup-Skylar/excelize"
+import (
+    "fmt"
+
+    "github.com/360EntSecGroup-Skylar/excelize"
+)
 
 func main() {
     categories := map[string]string{"A2": "Small", "A3": "Normal", "A4": "Large", "B1": "Apple", "C1": "Orange", "D1": "Pear"}
@@ -104,12 +116,12 @@ func main() {
         f.SetCellValue("Sheet1", k, v)
     }
     if err := f.AddChart("Sheet1", "E1", `{"type":"col3DClustered","series":[{"name":"Sheet1!$A$2","categories":"Sheet1!$B$1:$D$1","values":"Sheet1!$B$2:$D$2"},{"name":"Sheet1!$A$3","categories":"Sheet1!$B$1:$D$1","values":"Sheet1!$B$3:$D$3"},{"name":"Sheet1!$A$4","categories":"Sheet1!$B$1:$D$1","values":"Sheet1!$B$4:$D$4"}],"title":{"name":"Fruit 3D Clustered Column Chart"}}`); err != nil {
-        println(err.Error())
+        fmt.Println(err)
         return
     }
     // Save xlsx file by the given path.
     if err := f.SaveAs("Book1.xlsx"); err != nil {
-        println(err.Error())
+        fmt.Println(err)
     }
 }
 ```
@@ -120,6 +132,7 @@ func main() {
 package main
 
 import (
+    "fmt"
     _ "image/gif"
     _ "image/jpeg"
     _ "image/png"
@@ -130,24 +143,24 @@ import (
 func main() {
     f, err := excelize.OpenFile("Book1.xlsx")
     if err != nil {
-        println(err.Error())
+        fmt.Println(err)
         return
     }
     // Insert a picture.
     if err := f.AddPicture("Sheet1", "A2", "image.png", ""); err != nil {
-        println(err.Error())
+        fmt.Println(err)
     }
     // Insert a picture to worksheet with scaling.
     if err := f.AddPicture("Sheet1", "D2", "image.jpg", `{"x_scale": 0.5, "y_scale": 0.5}`); err != nil {
-        println(err.Error())
+        fmt.Println(err)
     }
     // Insert a picture offset in the cell with printing support.
     if err := f.AddPicture("Sheet1", "H2", "image.gif", `{"x_offset": 15, "y_offset": 10, "print_obj": true, "lock_aspect_ratio": false, "locked": false}`); err != nil {
-        println(err.Error())
+        fmt.Println(err)
     }
     // Save the xlsx file with the origin path.
     if err = f.Save(); err != nil {
-        println(err.Error())
+        fmt.Println(err)
     }
 }
 ```
diff --git a/README_zh.md b/README_zh.md
index c1ee83e..f75eec5 100644
--- a/README_zh.md
+++ b/README_zh.md
@@ -30,7 +30,11 @@ go get github.com/360EntSecGroup-Skylar/excelize
 ```go
 package main
 
-import "github.com/360EntSecGroup-Skylar/excelize"
+import (
+    "fmt"
+
+    "github.com/360EntSecGroup-Skylar/excelize"
+)
 
 func main() {
     f := excelize.NewFile()
@@ -43,7 +47,7 @@ func main() {
     f.SetActiveSheet(index)
     // 根据指定路径保存文件
     if err := f.SaveAs("Book1.xlsx"); err != nil {
-        println(err.Error())
+        fmt.Println(err)
     }
 }
 ```
@@ -55,28 +59,32 @@ func main() {
 ```go
 package main
 
-import "github.com/360EntSecGroup-Skylar/excelize"
+import (
+    "fmt"
+
+    "github.com/360EntSecGroup-Skylar/excelize"
+)
 
 func main() {
     f, err := excelize.OpenFile("Book1.xlsx")
     if err != nil {
-        println(err.Error())
+        fmt.Println(err)
         return
     }
     // 获取工作表中指定单元格的值
     cell, err := f.GetCellValue("Sheet1", "B2")
     if err != nil {
-        println(err.Error())
+        fmt.Println(err)
         return
     }
-    println(cell)
+    fmt.Println(cell)
     // 获取 Sheet1 上所有单元格
     rows, err := f.GetRows("Sheet1")
     for _, row := range rows {
         for _, colCell := range row {
-            print(colCell, "\t")
+            fmt.Print(colCell, "\t")
         }
-        println()
+        fmt.Println()
     }
 }
 ```
@@ -90,7 +98,11 @@ func main() {
 ```go
 package main
 
-import "github.com/360EntSecGroup-Skylar/excelize"
+import (
+    "fmt"
+
+    "github.com/360EntSecGroup-Skylar/excelize"
+)
 
 func main() {
     categories := map[string]string{"A2": "Small", "A3": "Normal", "A4": "Large", "B1": "Apple", "C1": "Orange", "D1": "Pear"}
@@ -103,12 +115,12 @@ func main() {
         f.SetCellValue("Sheet1", k, v)
     }
     if err := f.AddChart("Sheet1", "E1", `{"type":"col3DClustered","series":[{"name":"Sheet1!$A$2","categories":"Sheet1!$B$1:$D$1","values":"Sheet1!$B$2:$D$2"},{"name":"Sheet1!$A$3","categories":"Sheet1!$B$1:$D$1","values":"Sheet1!$B$3:$D$3"},{"name":"Sheet1!$A$4","categories":"Sheet1!$B$1:$D$1","values":"Sheet1!$B$4:$D$4"}],"title":{"name":"Fruit 3D Clustered Column Chart"}}`); err != nil {
-        println(err.Error())
+        fmt.Println(err)
         return
     }
     // 根据指定路径保存文件
     if err := f.SaveAs("Book1.xlsx"); err != nil {
-        println(err.Error())
+        fmt.Println(err)
     }
 }
 ```
@@ -119,6 +131,7 @@ func main() {
 package main
 
 import (
+    "fmt"
     _ "image/gif"
     _ "image/jpeg"
     _ "image/png"
@@ -129,24 +142,24 @@ import (
 func main() {
     f, err := excelize.OpenFile("Book1.xlsx")
     if err != nil {
-        println(err.Error())
+        fmt.Println(err)
         return
     }
     // 插入图片
     if err := f.AddPicture("Sheet1", "A2", "image.png", ""); err != nil {
-        println(err.Error())
+        fmt.Println(err)
     }
     // 在工作表中插入图片，并设置图片的缩放比例
     if err := f.AddPicture("Sheet1", "D2", "image.jpg", `{"x_scale": 0.5, "y_scale": 0.5}`); err != nil {
-        println(err.Error())
+        fmt.Println(err)
     }
     // 在工作表中插入图片，并设置图片的打印属性
     if err := f.AddPicture("Sheet1", "H2", "image.gif", `{"x_offset": 15, "y_offset": 10, "print_obj": true, "lock_aspect_ratio": false, "locked": false}`); err != nil {
-        println(err.Error())
+        fmt.Println(err)
     }
     // 保存文件
     if err = f.Save(); err != nil {
-        println(err.Error())
+        fmt.Println(err)
     }
 }
 ```
diff --git a/cell_test.go b/cell_test.go
index 60f8751..1efbc5a 100644
--- a/cell_test.go
+++ b/cell_test.go
@@ -110,7 +110,7 @@ func ExampleFile_SetCellFloat() {
 	f := NewFile()
 	var x = 3.14159265
 	if err := f.SetCellFloat("Sheet1", "A1", x, 2, 64); err != nil {
-		println(err.Error())
+		fmt.Println(err)
 	}
 	val, _ := f.GetCellValue("Sheet1", "A1")
 	fmt.Println(val)
diff --git a/chart.go b/chart.go
index 227cdee..69c2c95 100644
--- a/chart.go
+++ b/chart.go
@@ -503,7 +503,11 @@ func parseFormatChartSet(formatSet string) (*formatChart, error) {
 //
 //    package main
 //
-//    import "github.com/360EntSecGroup-Skylar/excelize"
+//    import (
+//        "fmt"
+//
+//        "github.com/360EntSecGroup-Skylar/excelize"
+//    )
 //
 //    func main() {
 //        categories := map[string]string{"A2": "Small", "A3": "Normal", "A4": "Large", "B1": "Apple", "C1": "Orange", "D1": "Pear"}
@@ -516,12 +520,12 @@ func parseFormatChartSet(formatSet string) (*formatChart, error) {
 //            f.SetCellValue("Sheet1", k, v)
 //        }
 //        if err := f.AddChart("Sheet1", "E1", `{"type":"col3DClustered","series":[{"name":"Sheet1!$A$2","categories":"Sheet1!$B$1:$D$1","values":"Sheet1!$B$2:$D$2"},{"name":"Sheet1!$A$3","categories":"Sheet1!$B$1:$D$1","values":"Sheet1!$B$3:$D$3"},{"name":"Sheet1!$A$4","categories":"Sheet1!$B$1:$D$1","values":"Sheet1!$B$4:$D$4"}],"title":{"name":"Fruit 3D Clustered Column Chart"},"plotarea":{"show_bubble_size":true,"show_cat_name":false,"show_leader_lines":false,"show_percent":true,"show_series_name":true,"show_val":true},"show_blanks_as":"zero","x_axis":{"reverse_order":true},"y_axis":{"maximum":7.5,"minimum":0.5}}`); err != nil {
-//            println(err.Error())
+//            fmt.Println(err)
 //            return
 //        }
 //        // Save xlsx file by the given path.
 //        if err := f.SaveAs("Book1.xlsx"); err != nil {
-//            println(err.Error())
+//            fmt.Println(err)
 //        }
 //    }
 //
@@ -697,7 +701,11 @@ func parseFormatChartSet(formatSet string) (*formatChart, error) {
 //
 //    package main
 //
-//    import "github.com/360EntSecGroup-Skylar/excelize"
+//    import (
+//        "fmt"
+//
+//        "github.com/360EntSecGroup-Skylar/excelize"
+//    )
 //
 //    func main() {
 //        categories := map[string]string{"A2": "Small", "A3": "Normal", "A4": "Large", "B1": "Apple", "C1": "Orange", "D1": "Pear"}
@@ -710,12 +718,12 @@ func parseFormatChartSet(formatSet string) (*formatChart, error) {
 //            f.SetCellValue("Sheet1", k, v)
 //        }
 //        if err := f.AddChart("Sheet1", "E1", `{"type":"col","series":[{"name":"Sheet1!$A$2","categories":"","values":"Sheet1!$B$2:$D$2"},{"name":"Sheet1!$A$3","categories":"Sheet1!$B$1:$D$1","values":"Sheet1!$B$3:$D$3"}],"format":{"x_scale":1.0,"y_scale":1.0,"x_offset":15,"y_offset":10,"print_obj":true,"lock_aspect_ratio":false,"locked":false},"legend":{"position":"left","show_legend_key":false},"title":{"name":"Clustered Column - Line Chart"},"plotarea":{"show_bubble_size":true,"show_cat_name":false,"show_leader_lines":false,"show_percent":true,"show_series_name":true,"show_val":true}}`, `{"type":"line","series":[{"name":"Sheet1!$A$4","categories":"Sheet1!$B$1:$D$1","values":"Sheet1!$B$4:$D$4"}],"format":{"x_scale":1.0,"y_scale":1.0,"x_offset":15,"y_offset":10,"print_obj":true,"lock_aspect_ratio":false,"locked":false},"legend":{"position":"left","show_legend_key":false},"plotarea":{"show_bubble_size":true,"show_cat_name":false,"show_leader_lines":false,"show_percent":true,"show_series_name":true,"show_val":true}}`); err != nil {
-//            println(err.Error())
+//            fmt.Println(err)
 //            return
 //        }
 //        // Save xlsx file by the given path.
 //        if err := f.SaveAs("Book1.xlsx"); err != nil {
-//            println(err.Error())
+//            fmt.Println(err)
 //        }
 //    }
 //
diff --git a/excelize.go b/excelize.go
index 9832c6a..e12e769 100644
--- a/excelize.go
+++ b/excelize.go
@@ -294,13 +294,13 @@ func (f *File) UpdateLinkedValue() error {
 // functions and/or macros. The file extension should be .xlsm. For example:
 //
 //    if err := f.SetSheetPrOptions("Sheet1", excelize.CodeName("Sheet1")); err != nil {
-//        println(err.Error())
+//        fmt.Println(err)
 //    }
 //    if err := f.AddVBAProject("vbaProject.bin"); err != nil {
-//        println(err.Error())
+//        fmt.Println(err)
 //    }
 //    if err := f.SaveAs("macros.xlsm"); err != nil {
-//        println(err.Error())
+//        fmt.Println(err)
 //    }
 //
 func (f *File) AddVBAProject(bin string) error {
diff --git a/excelize_test.go b/excelize_test.go
index c7f5cad..b78aac8 100644
--- a/excelize_test.go
+++ b/excelize_test.go
@@ -1259,7 +1259,7 @@ func fillCells(f *File, sheet string, colCount, rowCount int) {
 		for row := 1; row <= rowCount; row++ {
 			cell, _ := CoordinatesToCellName(col, row)
 			if err := f.SetCellStr(sheet, cell, cell); err != nil {
-				println(err.Error())
+				fmt.Println(err)
 			}
 		}
 	}
diff --git a/picture.go b/picture.go
index 0b91b91..3e24ce3 100644
--- a/picture.go
+++ b/picture.go
@@ -59,18 +59,18 @@ func parseFormatPictureSet(formatSet string) (*formatPicture, error) {
 //        f := excelize.NewFile()
 //        // Insert a picture.
 //        if err := f.AddPicture("Sheet1", "A2", "image.jpg", ""); err != nil {
-//            println(err.Error())
+//            fmt.Println(err)
 //        }
 //        // Insert a picture scaling in the cell with location hyperlink.
 //        if err := f.AddPicture("Sheet1", "D2", "image.png", `{"x_scale": 0.5, "y_scale": 0.5, "hyperlink": "#Sheet2!D8", "hyperlink_type": "Location"}`); err != nil {
-//            println(err.Error())
+//            fmt.Println(err)
 //        }
 //        // Insert a picture offset in the cell with external hyperlink, printing and positioning support.
 //        if err := f.AddPicture("Sheet1", "H2", "image.gif", `{"x_offset": 15, "y_offset": 10, "hyperlink": "https://github.com/360EntSecGroup-Skylar/excelize", "hyperlink_type": "External", "print_obj": true, "lock_aspect_ratio": false, "locked": false, "positioning": "oneCell"}`); err != nil {
-//            println(err.Error())
+//            fmt.Println(err)
 //        }
 //        if err := f.SaveAs("Book1.xlsx"); err != nil {
-//            println(err.Error())
+//            fmt.Println(err)
 //        }
 //    }
 //
@@ -104,6 +104,7 @@ func (f *File) AddPicture(sheet, cell, picture, format string) error {
 //    package main
 //
 //    import (
+//        "fmt"
 //        _ "image/jpeg"
 //        "io/ioutil"
 //
@@ -115,13 +116,13 @@ func (f *File) AddPicture(sheet, cell, picture, format string) error {
 //
 //        file, err := ioutil.ReadFile("image.jpg")
 //        if err != nil {
-//            println(err.Error())
+//            fmt.Println(err)
 //        }
 //        if err := f.AddPictureFromBytes("Sheet1", "A2", "", "Excel Logo", ".jpg", file); err != nil {
-//            println(err.Error())
+//            fmt.Println(err)
 //        }
 //        if err := f.SaveAs("Book1.xlsx"); err != nil {
-//            println(err.Error())
+//            fmt.Println(err)
 //        }
 //    }
 //
@@ -424,16 +425,16 @@ func (f *File) getSheetRelationshipsTargetByID(sheet, rID string) string {
 //
 //    f, err := excelize.OpenFile("Book1.xlsx")
 //    if err != nil {
-//        println(err.Error())
+//        fmt.Println(err)
 //        return
 //    }
 //    file, raw, err := f.GetPicture("Sheet1", "A2")
 //    if err != nil {
-//        println(err.Error())
+//        fmt.Println(err)
 //        return
 //    }
 //    if err := ioutil.WriteFile(file, raw, 0644); err != nil {
-//        println(err.Error())
+//        fmt.Println(err)
 //    }
 //
 func (f *File) GetPicture(sheet, cell string) (string, []byte, error) {
diff --git a/pivotTable.go b/pivotTable.go
index 70681ca..ee0d94e 100644
--- a/pivotTable.go
+++ b/pivotTable.go
@@ -63,10 +63,10 @@ type PivotTableOption struct {
 //            Columns:         []string{"Type"},
 //            Data:            []string{"Sales"},
 //        }); err != nil {
-//            println(err.Error())
+//            fmt.Println(err)
 //        }
 //        if err := f.SaveAs("Book1.xlsx"); err != nil {
-//            println(err.Error())
+//            fmt.Println(err)
 //        }
 //    }
 //
diff --git a/rows.go b/rows.go
index 40972ae..23f3a2c 100644
--- a/rows.go
+++ b/rows.go
@@ -25,18 +25,18 @@ import (
 //
 //    rows, err := f.Rows("Sheet1")
 //    if err != nil {
-//        println(err.Error())
+//        fmt.Println(err)
 //        return
 //    }
 //    for rows.Next() {
 //        row, err := rows.Columns()
 //        if err != nil {
-//            println(err.Error())
+//            fmt.Println(err)
 //        }
 //        for _, colCell := range row {
-//            print(colCell, "\t")
+//            fmt.Print(colCell, "\t")
 //        }
-//        println()
+//        fmt.Println()
 //    }
 //
 func (f *File) GetRows(sheet string) ([][]string, error) {
@@ -152,18 +152,18 @@ func (err ErrSheetNotExist) Error() string {
 //
 //    rows, err := f.Rows("Sheet1")
 //    if err != nil {
-//        println(err.Error())
+//        fmt.Println(err)
 //        return
 //    }
 //    for rows.Next() {
 //        row, err := rows.Columns()
 //        if err != nil {
-//            println(err.Error())
+//            fmt.Println(err)
 //        }
 //        for _, colCell := range row {
-//            print(colCell, "\t")
+//            fmt.Print(colCell, "\t")
 //        }
-//        println()
+//        fmt.Println()
 //    }
 //
 func (f *File) Rows(sheet string) (*Rows, error) {
diff --git a/sheet.go b/sheet.go
index a6ff2a1..48671c0 100644
--- a/sheet.go
+++ b/sheet.go
@@ -344,7 +344,7 @@ func (f *File) GetSheetIndex(name string) int {
 //        return
 //    }
 //    for index, name := range f.GetSheetMap() {
-//        println(index, name)
+//        fmt.Println(index, name)
 //    }
 //
 func (f *File) GetSheetMap() map[int]string {
diff --git a/sheet_test.go b/sheet_test.go
index a03066a..69c8f22 100644
--- a/sheet_test.go
+++ b/sheet_test.go
@@ -19,7 +19,7 @@ func ExampleFile_SetPageLayout() {
 		"Sheet1",
 		excelize.PageLayoutOrientation(excelize.OrientationLandscape),
 	); err != nil {
-		println(err.Error())
+		fmt.Println(err)
 	}
 	if err := f.SetPageLayout(
 		"Sheet1",
@@ -27,7 +27,7 @@ func ExampleFile_SetPageLayout() {
 		excelize.FitToHeight(2),
 		excelize.FitToWidth(2),
 	); err != nil {
-		println(err.Error())
+		fmt.Println(err)
 	}
 	// Output:
 }
@@ -41,17 +41,17 @@ func ExampleFile_GetPageLayout() {
 		fitToWidth  excelize.FitToWidth
 	)
 	if err := f.GetPageLayout("Sheet1", &orientation); err != nil {
-		println(err.Error())
+		fmt.Println(err)
 	}
 	if err := f.GetPageLayout("Sheet1", &paperSize); err != nil {
-		println(err.Error())
+		fmt.Println(err)
 	}
 	if err := f.GetPageLayout("Sheet1", &fitToHeight); err != nil {
-		println(err.Error())
+		fmt.Println(err)
 	}
 
 	if err := f.GetPageLayout("Sheet1", &fitToWidth); err != nil {
-		println(err.Error())
+		fmt.Println(err)
 	}
 	fmt.Println("Defaults:")
 	fmt.Printf("- orientation: %q\n", orientation)
diff --git a/sheetpr_test.go b/sheetpr_test.go
index 6a35a6e..25b67d7 100644
--- a/sheetpr_test.go
+++ b/sheetpr_test.go
@@ -40,7 +40,7 @@ func ExampleFile_SetSheetPrOptions() {
 		excelize.AutoPageBreaks(true),
 		excelize.OutlineSummaryBelow(false),
 	); err != nil {
-		println(err.Error())
+		fmt.Println(err)
 	}
 	// Output:
 }
@@ -66,7 +66,7 @@ func ExampleFile_GetSheetPrOptions() {
 		&autoPageBreaks,
 		&outlineSummaryBelow,
 	); err != nil {
-		println(err.Error())
+		fmt.Println(err)
 	}
 	fmt.Println("Defaults:")
 	fmt.Printf("- codeName: %q\n", codeName)
@@ -189,7 +189,7 @@ func ExampleFile_SetPageMargins() {
 		excelize.PageMarginRight(1.0),
 		excelize.PageMarginTop(1.0),
 	); err != nil {
-		println(err.Error())
+		fmt.Println(err)
 	}
 	// Output:
 }
@@ -215,7 +215,7 @@ func ExampleFile_GetPageMargins() {
 		&marginRight,
 		&marginTop,
 	); err != nil {
-		println(err.Error())
+		fmt.Println(err)
 	}
 	fmt.Println("Defaults:")
 	fmt.Println("- marginBottom:", marginBottom)
diff --git a/sheetview_test.go b/sheetview_test.go
index 8412002..d999875 100644
--- a/sheetview_test.go
+++ b/sheetview_test.go
@@ -47,7 +47,7 @@ func ExampleFile_SetSheetViewOptions() {
 		excelize.ZoomScale(80),
 		excelize.TopLeftCell("C3"),
 	); err != nil {
-		println(err.Error())
+		fmt.Println(err)
 	}
 
 	var zoomScale excelize.ZoomScale
@@ -55,22 +55,22 @@ func ExampleFile_SetSheetViewOptions() {
 	fmt.Println("- zoomScale: 80")
 
 	if err := f.SetSheetViewOptions(sheet, 0, excelize.ZoomScale(500)); err != nil {
-		println(err.Error())
+		fmt.Println(err)
 	}
 
 	if err := f.GetSheetViewOptions(sheet, 0, &zoomScale); err != nil {
-		println(err.Error())
+		fmt.Println(err)
 	}
 
 	fmt.Println("Used out of range value:")
 	fmt.Println("- zoomScale:", zoomScale)
 
 	if err := f.SetSheetViewOptions(sheet, 0, excelize.ZoomScale(123)); err != nil {
-		println(err.Error())
+		fmt.Println(err)
 	}
 
 	if err := f.GetSheetViewOptions(sheet, 0, &zoomScale); err != nil {
-		println(err.Error())
+		fmt.Println(err)
 	}
 
 	fmt.Println("Used correct value:")
@@ -111,7 +111,7 @@ func ExampleFile_GetSheetViewOptions() {
 		&zoomScale,
 		&topLeftCell,
 	); err != nil {
-		println(err.Error())
+		fmt.Println(err)
 	}
 
 	fmt.Println("Default:")
@@ -125,27 +125,27 @@ func ExampleFile_GetSheetViewOptions() {
 	fmt.Println("- topLeftCell:", `"`+topLeftCell+`"`)
 
 	if err := f.SetSheetViewOptions(sheet, 0, excelize.TopLeftCell("B2")); err != nil {
-		println(err.Error())
+		fmt.Println(err)
 	}
 
 	if err := f.GetSheetViewOptions(sheet, 0, &topLeftCell); err != nil {
-		println(err.Error())
+		fmt.Println(err)
 	}
 
 	if err := f.SetSheetViewOptions(sheet, 0, excelize.ShowGridLines(false)); err != nil {
-		println(err.Error())
+		fmt.Println(err)
 	}
 
 	if err := f.GetSheetViewOptions(sheet, 0, &showGridLines); err != nil {
-		println(err.Error())
+		fmt.Println(err)
 	}
 
 	if err := f.SetSheetViewOptions(sheet, 0, excelize.ShowZeros(false)); err != nil {
-		println(err.Error())
+		fmt.Println(err)
 	}
 
 	if err := f.GetSheetViewOptions(sheet, 0, &showZeros); err != nil {
-		println(err.Error())
+		fmt.Println(err)
 	}
 
 	fmt.Println("After change:")
diff --git a/sparkline_test.go b/sparkline_test.go
index 45bf386..4b059ab 100644
--- a/sparkline_test.go
+++ b/sparkline_test.go
@@ -298,12 +298,12 @@ func prepareSparklineDataset() *File {
 	f.NewSheet("Sheet3")
 	for row, data := range sheet2 {
 		if err := f.SetSheetRow("Sheet2", fmt.Sprintf("A%d", row+1), &data); err != nil {
-			println(err.Error())
+			fmt.Println(err)
 		}
 	}
 	for row, data := range sheet3 {
 		if err := f.SetSheetRow("Sheet3", fmt.Sprintf("A%d", row+1), &data); err != nil {
-			println(err.Error())
+			fmt.Println(err)
 		}
 	}
 	return f
diff --git a/stream.go b/stream.go
index c854d8b..98cf828 100644
--- a/stream.go
+++ b/stream.go
@@ -42,14 +42,14 @@ type StreamWriter struct {
 //    file := excelize.NewFile()
 //    streamWriter, err := file.NewStreamWriter("Sheet1")
 //    if err != nil {
-//        println(err.Error())
+//        fmt.Println(err)
 //    }
 //    styleID, err := file.NewStyle(`{"font":{"color":"#777777"}}`)
 //    if err != nil {
-//        println(err.Error())
+//        fmt.Println(err)
 //    }
 //    if err := streamWriter.SetRow("A1", []interface{}{excelize.Cell{StyleID: styleID, Value: "Data"}}); err != nil {
-//        println(err.Error())
+//        fmt.Println(err)
 //    }
 //    for rowID := 2; rowID <= 102400; rowID++ {
 //        row := make([]interface{}, 50)
@@ -58,14 +58,14 @@ type StreamWriter struct {
 //        }
 //        cell, _ := excelize.CoordinatesToCellName(1, rowID)
 //        if err := streamWriter.SetRow(cell, row); err != nil {
-//            println(err.Error())
+//            fmt.Println(err)
 //        }
 //    }
 //    if err := streamWriter.Flush(); err != nil {
-//        println(err.Error())
+//        fmt.Println(err)
 //    }
 //    if err := file.SaveAs("Book1.xlsx"); err != nil {
-//        println(err.Error())
+//        fmt.Println(err)
 //    }
 //
 func (f *File) NewStreamWriter(sheet string) (*StreamWriter, error) {
diff --git a/styles.go b/styles.go
index ad3e825..272d728 100644
--- a/styles.go
+++ b/styles.go
@@ -2321,7 +2321,7 @@ func (f *File) GetCellStyle(sheet, axis string) (int, error) {
 //
 //    style, err := f.NewStyle(`{"border":[{"type":"left","color":"0000FF","style":3},{"type":"top","color":"00FF00","style":4},{"type":"bottom","color":"FFFF00","style":5},{"type":"right","color":"FF0000","style":6},{"type":"diagonalDown","color":"A020F0","style":7},{"type":"diagonalUp","color":"A020F0","style":8}]}`)
 //    if err != nil {
-//        println(err.Error())
+//        fmt.Println(err)
 //    }
 //    err = f.SetCellStyle("Sheet1", "H9", "H9", style)
 //
@@ -2330,7 +2330,7 @@ func (f *File) GetCellStyle(sheet, axis string) (int, error) {
 //
 //    style, err := f.NewStyle(`{"fill":{"type":"gradient","color":["#FFFFFF","#E0EBF5"],"shading":1}}`)
 //    if err != nil {
-//        println(err.Error())
+//        fmt.Println(err)
 //    }
 //    err = f.SetCellStyle("Sheet1", "H9", "H9", style)
 //
@@ -2338,7 +2338,7 @@ func (f *File) GetCellStyle(sheet, axis string) (int, error) {
 //
 //    style, err := f.NewStyle(`{"fill":{"type":"pattern","color":["#E0EBF5"],"pattern":1}}`)
 //    if err != nil {
-//        println(err.Error())
+//        fmt.Println(err)
 //    }
 //    err = f.SetCellStyle("Sheet1", "H9", "H9", style)
 //
@@ -2346,7 +2346,7 @@ func (f *File) GetCellStyle(sheet, axis string) (int, error) {
 //
 //    style, err := f.NewStyle(`{"alignment":{"horizontal":"center","ident":1,"justify_last_line":true,"reading_order":0,"relative_indent":1,"shrink_to_fit":true,"text_rotation":45,"vertical":"","wrap_text":true}}`)
 //    if err != nil {
-//        println(err.Error())
+//        fmt.Println(err)
 //    }
 //    err = f.SetCellStyle("Sheet1", "H9", "H9", style)
 //
@@ -2357,7 +2357,7 @@ func (f *File) GetCellStyle(sheet, axis string) (int, error) {
 //    f.SetCellValue("Sheet1", "H9", 42920.5)
 //    style, err := f.NewStyle(`{"number_format": 22}`)
 //    if err != nil {
-//        println(err.Error())
+//        fmt.Println(err)
 //    }
 //    err = f.SetCellStyle("Sheet1", "H9", "H9", style)
 //
@@ -2365,7 +2365,7 @@ func (f *File) GetCellStyle(sheet, axis string) (int, error) {
 //
 //    style, err := f.NewStyle(`{"font":{"bold":true,"italic":true,"family":"Times New Roman","size":36,"color":"#777777"}}`)
 //    if err != nil {
-//        println(err.Error())
+//        fmt.Println(err)
 //    }
 //    err = f.SetCellStyle("Sheet1", "H9", "H9", style)
 //
@@ -2373,7 +2373,7 @@ func (f *File) GetCellStyle(sheet, axis string) (int, error) {
 //
 //    style, err := f.NewStyle(`{"protection":{"hidden":true, "locked":true}}`)
 //    if err != nil {
-//        println(err.Error())
+//        fmt.Println(err)
 //    }
 //    err = f.SetCellStyle("Sheet1", "H9", "H9", style)
 //
@@ -2507,7 +2507,7 @@ func (f *File) SetCellStyle(sheet, hcell, vcell string, styleID int) error {
 //
 //    format, err = f.NewConditionalStyle(`{"font":{"color":"#9A0511"},"fill":{"type":"pattern","color":["#FEC7CE"],"pattern":1}}`)
 //    if err != nil {
-//        println(err.Error())
+//        fmt.Println(err)
 //    }
 //    f.SetConditionalFormat("Sheet1", "A1:A10", fmt.Sprintf(`[{"type":"cell","criteria":">","format":%d,"value":"6"}]`, format))
 //