openpyxl 'NoneType' 对象没有属性 'font'

Question

我正在编写一个函数，将值放入电子表格并根据值为单元格着色。现在由于某种原因，我遇到了一个奇怪的 'NoneType' 错误，这完全困扰着我：

Traceback (most recent call last):
  File "vix.py", line 168, in <module>
    printexceldaily(1990, 2015, 'All_Lows', 10, 15, 18, 28)
  File "vix.py", line 166, in printexceldaily
    xlbook.save('%s.xlsx' % sheetname)
  File "/usr/local/lib/python3.4/dist-packages/openpyxl/workbook/workbook.py", line 281, in save
    save_workbook(self, filename)
  File "/usr/local/lib/python3.4/dist-packages/openpyxl/writer/excel.py", line 214, in save_workbook
    writer.save(filename)
  File "/usr/local/lib/python3.4/dist-packages/openpyxl/writer/excel.py", line 197, in save
    self.write_data(archive)
  File "/usr/local/lib/python3.4/dist-packages/openpyxl/writer/excel.py", line 98, in write_data
    archive.writestr(ARC_STYLE, self.style_writer.write_table())
  File "/usr/local/lib/python3.4/dist-packages/openpyxl/writer/styles.py", line 39, in write_table
    self._write_cell_xfs(number_format_node, fonts_node, fills_node, borders_node)
  File "/usr/local/lib/python3.4/dist-packages/openpyxl/writer/styles.py", line 159, in _write_cell_xfs
    font = st.font
AttributeError: 'NoneType' object has no attribute 'font'

我试着查看 styles.py 和 excel.py 中的代码，看看我是否能找出可能导致它的原因，但我无法真正理解其中的任何一个。

这是我的代码：

def printexceldaily(startyear, endyear, sheetname, start, hold, buy, end):

xlbook = Workbook()
xsheet = xlbook.active
xsheet.title = sheetname
colors = colorlist()
comparisonlist = comparisonmap(start, hold, buy, end)
length = len(comparisonlist)

# fill a list with a style for every element of colors using coloredcell
styles = [coloredcell(color) for color in colors] 

def getstyle(value):
    for ceiling in comparisonlist:
        if value < ceiling: 
            z = np.where(comparisonlist==ceiling)
            return styles[z[0]]
        elif value > comparisonlist[length - 1]: # we need to check if value is greater than upper bound too
            return styles[length - 1]

# create the cells for days
for i in range(2, 32):
    xsheet.cell(row = 1, column = i).value = i

xlrow = endyear - startyear + 2
for year in range(startyear, endyear):
    for month in range(12):
        xsheet.cell(row = xlrow, column = 1).value = "%s, %d" % (xltomonth[month+1], year)
        for day in range(monthlim[month + 1]):
            curdatestr = '%d-%d-%d' % (year, month + 1, day + 1)
            try:
                curx = vix.loc[curdatestr, 'Low']
            except KeyError:
                xsheet.cell(row = xlrow, column = day+2).value = np.nan
            else:
                xsheet.cell(row = xlrow, column = day+2).value = curx #add value to cell
                xsheet.cell(row = xlrow, column = day+2).style = getstyle(curx) #add style to cell

        xlrow += 1
print('saving')
xlbook.save('%s.xlsx' % sheetname)

我已经得到了一个非常相似的 "printexcelmonthly()" 功能，我可以 post 如果它有帮助，但由于某种原因，当我尝试保存电子表格时，这个功能一直出现故障 o_O

Answer 1

您的代码不完整或格式错误：函数体在哪里 printexceldaily？您使用的是什么版本的 openpyxl？

我怀疑问题与您正在创建的样式有关。这些必须是 openpyxl.styles.Style 对象的实例，它们将始终具有 font 属性。如果你想调试这个你可以看看xlbook.shared_styles.

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openpyxl 'NoneType' 对象没有属性 'font'

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