Question

我有一个for循环，可以从网站上的电子表格中提取数据，并将数据写入文本文件。电子表格通常不会更新，因此是空白的。当电子表格为空白时，我的循环失败。如果失败，我将如何跳过循环？

for row in aatable.findAll('tr')[1:]:
     items = row.text.replace(u"kn","") # remove kn so items line up when unpacking
     time, ais_source, speed_km, lat, lon, course = items.split()[1:7]
     data = items.split()[1:7]
     text_file.write(str(data)+ ",Adams Challenge"+'\n')

Answer 1

将aatable.findAll('tr')分配给变量data并检查if data以获取空列表：

data = aatable.findAll('tr')
if data: # will be False for []
    for row in data[1:]:
         items = row.text.replace(u"kn","") # remove kn so items line up when unpacking
         time, ais_source, speed_km, lat, lon, course = items.split()[1:7]
         data = items.split()[1:7]
         text_file.write(str(data)+ ",Adams Challenge"+'\n')

或使用try/except来抓住ValueError：

try:
    for row in aatable.findAll('tr')[1:]:
         items = row.text.replace(u"kn","") # remove kn so items line up when unpacking
         time, ais_source, speed_km, lat, lon, course = items.split()[1:7]
         data = items.split()[1:7]
         text_file.write(str(data)+ ",Adams Challenge"+'\n')
except ValueError:
    pass

在电子表格中跳过空白单元格

1 个答案: