将子列表的列表写入文件中，不带括号，并用“;”分隔

Question

I'm new here (and also in python) so tell me if I do something wrong. I have a little (I think) problem: I have a list of sublists where all variables (x) are float:

tab=[[x11,x12,x13],[x21,x22,x23]]

And I wanto to write to the *txt file without brackets [] and separated by ";" like this:

x11;x12;x13

x21;x22;x23

I tried to do it like this: but i have no idea what should I do next.

tab=[[x11,x12,x13],[x21,x22,x23]]
result=open("result.txt","w")
result.write("\n".join(map(lambda x: str(x), tab)))
result.close()

A lot of thanks for everyone who will try to help me.

Answer 1

You can use the csv module for this:

import csv

with open("result.txt", "wb") as result:
    writer = csv.writer(result, delimiter=';')
    writer.writerows(tab)

The csv.writer.writerows() method takes a list of lists, and converts floating point values to strings for you.

Answer 2

You should use this:

result.write("\n".join([';'.join([str(x) for x in item]) for item in tab]))

Or, little simpler:

result.write("\n".join([';'.join(map(str, item)) for item in tab]))