如何在python中识别csv文件中的空白字段？

Question

I have a csv file with 5 columns:

1, 2312, "A", , 20
2, 8383, "B", "UK", 
3, 3883, , , 45

where the columns represent id, customerId, customerName, customerAddress and customerAge. I want to put 0 at the place where the age is blank and '' where the other string type attributes are blank. But I can't identify the blank field in python. I have tried doing some things like:

1. len(row[4]) == 0
2. row[4] == ''
3. row[4] == None
4. repr(row[4]) == ''

but it didn't work. What am I doing wrong?

Answer 1

you want to use not

0 , None , False , '' are all not True

if not row[4]:

you could also do

bool(row[4])

which will return False for all the above mentioned values