使用 Python 将图表从 Excel 导出为图像

Question

我一直在尝试将 Excel 中的图表导出为 Python 中的图像文件（JPG 或 ING）。我在看WIN32com。这是我到目前为止所拥有的。

import win32com.client as win32
excel = win32.gencache.EnsureDispatch("Excel.Application")
wb = excel.Workbooks.Open("<WORKSHEET NAME>")
r = wb.Sheets("<SHEET NAME>").Range("A1:J50") 
# Here A1:J50 is the area over which cart is
r.CopyPicture()

这就是我卡住的地方。我现在需要将所选范围复制到文件中。对文档的任何帮助或指示都会对我有很大帮助。

我已经根据以下 VBA 脚本对上面的代码进行了建模：

Sub Export_Range_Images()
    ' =========================================
    ' Code to save selected Excel Range as Image
    ' =========================================
    Dim oRange As Range
    Dim oCht As Chart
    Dim oImg As Picture

    Set oRange = Range("A1:B2")
    Set oCht = Charts.Add
    oRange.CopyPicture xlScreen, xlPicture
    oCht.Paste
    oCht.Export FileName:="C:\temp\SavedRange.jpg", Filtername:="JPG"
End Sub

代码片段来自：http://vbadud.blogspot.com/2010/06/how-to-save-excel-range-as-image-using.html

Answer 1

我必须查看一些 VBA 示例才能使其正常工作。虽然我讨厌回答自己的问题，但我还是把它留在这里给可能需要它的人。

    import win32com.client as win32
    wb = excel.Workbooks.Open(excel_file)
    selection = "A1:J30" 
    xl_range = wb.Sheets(<sheet_name>).Range(selection)
    excel.ActiveWorkbook.Sheets.Add(                  After=excel.ActiveWorkbook.Sheets(3)).Name="image_sheet"
    cht = excel.ActiveSheet.ChartObjects().Add(0,0,
                                            xl_range.Width, xl_range.Height)
    xl_range.CopyPicture()
    # add the chart to new sheet
    cht.Chart.Paste()
    # Export the sheet with the chart to a new file
    cht.Chart.Export(<image_filename>)
    # Delete the sheet
    cht.Delete()
    excel.ActiveSheet.Delete()
    # Close the book
    excel.ActiveWorkbook.Close()

Answer 2

我知道这是一个老问题，但它帮助我走上了正确的轨道，所以我回来分享我完成的脚本，该脚本在工作表中找到所有图表并将它们导出为 .png。 上面的脚本可以工作，但由于它只是复制工作表中的一个范围，因此您取决于该位置的图表。

    import win32com.client as win32
    from win32com.client import Dispatch
    import os

    xlApp = Dispatch('Excel.Application')

    workbook = xlApp.Workbooks.Open("Book1.xls")
    xlApp.Sheets("Sheet1").Select()

    xlSheet1 = xlApp.Sheets(1)

    #WARNING: The following line will cause the script to discard any unsaved changes in your workbook
    #Ensure to save any work before running script
    xlApp.DisplayAlerts = False

    i = 0
    for chart in xlSheet1.ChartObjects():
        print chart.Name

        chart.CopyPicture()
        #Create new temporary sheet
        xlApp.ActiveWorkbook.Sheets.Add(After=xlApp.ActiveWorkbook.Sheets(3)).Name="temp_sheet" + str(i)
        temp_sheet = xlApp.ActiveSheet

        #Add chart object to new sheet.
        cht = xlApp.ActiveSheet.ChartObjects().Add(0,0,800, 600)
        #Paste copied chart into new object
        cht.Chart.Paste()
        #Export image
        cht.Chart.Export("chart" + str(i) + ".png")

        #This line is not entirely neccessary since script currently exits without saving
        temp_sheet.Delete()
        i = i+1

    xlApp.ActiveWorkbook.Close()
    #Restore default behaviour
    xlApp.DisplayAlerts = True

Answer 3

对我来说效果很好：

from win32com.client import Dispatch

app = Dispatch("Excel.Application")
workbook_file_name = 'Programmes.xlsx'
workbook = app.Workbooks.Open(Filename=workbook_file_name)

# WARNING: The following line will cause the script to discard any unsaved changes in your workbook
app.DisplayAlerts = False

i = 1
for sheet in workbook.Worksheets:
    for chartObject in sheet.ChartObjects():
        # print(sheet.Name + ':' + chartObject.Name)
        chartObject.Chart.Export("chart" + str(i) + ".png")
        i += 1

workbook.Close(SaveChanges=False, Filename=workbook_file_name)

或者这个：

from win32com.client import Dispatch

app = Dispatch("Excel.Application")
workbook_file_name = 'Programmes.xlsx'
workbook = app.Workbooks.Open(Filename=workbook_file_name)
app.DisplayAlerts = False
try:
    workbook.SaveAs(Filename="ExcelCharts.htm", FileFormat=44)  # 44 = html file format
except Exception as ex:
    print(ex)
finally:
    workbook.Close(SaveChanges=False, Filename=workbook_file_name)

Answer 4

现在我会推荐 excel2img 库，对我很有帮助。确保已安装（pip install excel2img）

import excel2img

excel2img.export_img("test.xlsx", "test.gif", "Sheet1", "MyNamedRange")

如果您不需要网格线 - 只需将其隐藏在 excel 中即可。

git 代表：excel2img 了解更多信息。