python - 将数据传输到 excel 时如何处理 "old"日期

Question

我有一个数据框，其中一列包含日期字符串。我首先将其转换为日期时间:

mydf['Desk Date'] = pd.to_datetime(mydf['Desk Date'])`

然后删除数据框以 excel

Range('A1').value = mydf`

我收到以下错误:

Traceback (most recent call last):
File "C:\Program Files (x86)\Python271\lib\site-packages\IPython\core\interactiveshell.py", line 3035, in run_code
exec(code_obj, self.user_global_ns, self.user_ns)
File "<ipython-input-111-6c6f5ea1ff17>", line 1, in <module>
Import.ImportFWD(test_path)
File "C:\Users\jastrzem\Downloads\pyWFP\Import.py", line 42, in ImportFWD
Range('A1').value = mydf
File "C:\Program Files (x86)\Python271\lib\site-packages\xlwings\main.py", line 818, in value
self.row1, self.col1, row2, col2), data)
File "C:\Program Files (x86)\Python271\lib\site-packages\xlwings\_xlwindows.py", line 151, in set_value
xl_range.Value = data
File "C:\Program Files (x86)\Python271\lib\site-packages\win32com\client\dynamic.py", line 560, in __setattr__
self._oleobj_.Invoke(entry.dispid, 0, invoke_type, 0, value)
com_error: (-2147352567, 'Exception occurred.', (0, None, None, None, 0, -2146827284), None)

其中一个日期是 Timestamp('1899-01-31 00:00:00') 我认为这是错误的原因。

我尝试使用 np.where 将 2000 年之前的所有值替换为 NaN，但没有成功。

f = lambda x: x.year
mydf['Desk Date'] = np.where(pd.DataFrame(mydf['Desk Date']).applymap(f) > 2000, pd.to_datetime(mydf['Desk Date'], format='%D/%M/%Y'),np.nan)

如何修复上述命令或者我应该如何处理“不可转移”到 excel 的日期？

谢谢!

[编辑]: 我尝试使用 to_excel 方法，但也没有成功。我放在函数末尾的代码:

writer = pd.ExcelWriter('test7.xlsx', engine='xlsxwriter')
mydf.to_excel(writer, sheet_name = 'Sheet1')
writer.close()

它创建了文件，但它是空的。我收到以下错误:

Traceback (most recent call last):
File "C:\Program Files (x86)\Python271\lib\site-packages\IPython\core\interactiveshell.py", line 3035, in run_code
exec(code_obj, self.user_global_ns, self.user_ns)
File "<ipython-input-26-6c6f5ea1ff17>", line 1, in <module>
Import.ImportFWD(test_path)
File "C:\Users\jastrzem\Downloads\pyWFP\Import.py", line 44, in ImportFWD
writer.close()
File "C:\Program Files (x86)\Python271\lib\site-packages\pandas\io\excel.py", line 623, in close
return self.save()
File "C:\Program Files (x86)\Python271\lib\site-packages\pandas\io\excel.py", line 1298, in save
return self.book.close()
File "C:\Program Files (x86)\Python271\lib\site-packages\xlsxwriter\workbook.py", line 295, in close
self._store_workbook()
File "C:\Program Files (x86)\Python271\lib\site-packages\xlsxwriter\workbook.py", line 518, in _store_workbook
xml_files = packager._create_package()
File "C:\Program Files (x86)\Python271\lib\site-packages\xlsxwriter\packager.py", line 140, in _create_package
self._write_shared_strings_file()
File "C:\Program Files (x86)\Python271\lib\site-packages\xlsxwriter\packager.py", line 280, in _write_shared_strings_file
sst._assemble_xml_file()
File "C:\Program Files (x86)\Python271\lib\site-packages\xlsxwriter\sharedstrings.py", line 53, in _assemble_xml_file
self._write_sst_strings()
File "C:\Program Files (x86)\Python271\lib\site-packages\xlsxwriter\sharedstrings.py", line 83, in _write_sst_strings
self._write_si(string)
File "C:\Program Files (x86)\Python271\lib\site-packages\xlsxwriter\sharedstrings.py", line 110, in _write_si
self._xml_si_element(string, attributes)
File "C:\Program Files (x86)\Python271\lib\site-packages\xlsxwriter\xmlwriter.py", line 122, in _xml_si_element
self.fh.write("""<si><t%s>%s</t></si>""" % (attr, string))
File "C:\Program Files (x86)\Python271\lib\codecs.py", line 694, in write
return self.writer.write(data)
File "C:\Program Files (x86)\Python271\lib\codecs.py", line 357, in write
data, consumed = self.encode(object, self.errors)
UnicodeDecodeError: 'ascii' codec can't decode byte 0x94 in position 26: ordinal not in range(128)

Answer 1

错误不是因为旧日期，而是因为您正试图将整个数据框扔到单个单元格中。

相反，使用 to_excel方法。