Python 3.7.7，Openpyxl 3.0.3;如何：在forer_rows（）循环内正确使用delete_rows（）？

Question

此问题涉及OpenPyxl的delete_rows（）函数修改excel文件中的行索引号的方法。

Goal：使用此代码段，我想检查表中每一行的特定列，如果该列的单元格值等于特定值或为空，那么我想从表中删除整行。

问题：当delete_rows（）函数删除一行时，似乎会更改其余行的索引，从而导致其余行无法正确删除（我介绍了一个行计数器，它根据关于是否发生删除，但这似乎无济于事）。

非常感谢任何想法或建议。谢谢！

链接到sample.xlsx文件：https://filebin.net/c4gd9b4kd38burun

如果上面的链接失效，以下是sample.xlsx文件的屏幕截图：

代码段：

#imports
from openpyxl import load_workbook

#load file
excel_file = "sample.xlsx"
workbook = load_workbook(filename=excel_file, data_only=True)
sheet = workbook.active

#deleting first row, and cleaning up headers
sheet.delete_rows(1)
sheet["D1"].value = "check 1" 
sheet["E1"].value = "check 2"

#remove all rows that start with years earlier than 2018 or are empty
row_number=2
for row in sheet.iter_rows(min_col=2, max_col=2, min_row=2, values_only=True):
    for cell in row:
        str_cell = str(cell)

        if str_cell.startswith("2017"):
            sheet.delete_rows(idx=row_number)
            row_number = row_number - 1
        if str_cell.startswith("2016"):
            sheet.delete_rows(idx=row_number)
            row_number = row_number - 1
        if str_cell.startswith("2015"):
            sheet.delete_rows(idx=row_number)
            row_number = row_number - 1
        if str_cell == None:
            sheet.delete_rows(idx=row_number)
            row_number = row_number - 1

        row_number = row_number + 1         

#save as new file
workbook.save(filename="sample_test.xlsx")

Answer 1

经过更多研究，我遇到了以下stackoverflow问题：Can't get OpenPyXl to delete rows

用户Charlie Clark指出，应以相反的顺序执行行删除，以避免出现索引问题。我调整了代码以实现此想法，并使其能够按需执行。我在下面附加了我的工作代码，以防其他人遇到类似问题时指出正确的方向。

代码段：

#imports
from openpyxl import load_workbook

#load file
excel_file = "sample.xlsx"
workbook = load_workbook(filename=excel_file, data_only=True)
sheet = workbook.active

#deleting first row, and cleaning up headers
sheet.delete_rows(1)
sheet["D1"].value = "check 1" 
sheet["E1"].value = "check 2"

i=1
del_rows = []
for row in sheet.iter_rows(min_col=2, max_col=2, min_row=2):
    i += 1
    rowcellvals = []
    for cell in row:
        str_cell = str(cell.value)
        if str_cell.startswith("2017"):
            del_rows.append(i)

        elif str_cell.startswith("2016"):
            del_rows.append(i)

        elif str_cell.startswith("2015"):
            del_rows.append(i)

        elif cell.value is None:
            del_rows.append(i)

for r in reversed(del_rows):
    sheet.delete_rows(r)

#save as new file
workbook.save(filename="sample_test.xlsx")