如何删除某个字符后的所有内容？

Question

Code:

with open('list.csv', "w") as csv_file:
    writer = csv.writer(csv_file)
    writer.writerows(results)

Example

If my output is 123,456789 , how would I remove everything after the comma?

Answer 1

you can just use the first element only (by slicing) when you write the rows.

Do something like this:

with open('list.csv', "w") as csv_file:
    writer = csv.writer(csv_file)
    writer.writerows(map(lambda row:row[:1], results))

Answer 2

Supposing result is your output, this will do:

result = result.split(',')[0]

Answer 3

You can use split() to split the text where the comma is, then take the first piece:

with open('list.csv', "w") as csv_file:
    writer = csv.writer(csv_file)
    writer.writerows(results.split(',')[0])