如何在cgi / python中将列表列表写入文件？

Question

I have a list of list :

 table = []
 headers = ["JobId", "Name", "Start_Date", "End_Date", "Value"]
 table.append(headers)
 values1 = ['efwef', 'erwerw', '01', '02', 99]
 table.append(values1)
 values2 = ['efwsdfsef', 'erdwerw', '01']
 table.append(values2)

The table is a list of list where each list has different length of elements and all elements may be string

index.cgi :

print "Content-Type: text/plain; charset=UTF-8"
print "Content-Disposition: attachment; filename=test.txt"
print

for row in table:
    for row_values in row:
        if type(row_values) is not str:
            row_values = str(row_values)
        print row_values + '\t'
    print '\n'

But this prints :

JobId
Name
Start_Date
End_Date
Value

efwef
erwerw
01
02
99

.... ....

Can some one tell me what I am doing wrong here ? I tried replacing '\\n' and print "#########" still I see:

   JobId
    Name
    Start_Date
    End_Date
    Value
##########################
    efwef
    erwerw
    01
    02
    99
##########################

even though I didn't add '\\n' each element in the list is printing in a new line.

Answer 1

print adds a newline. One way to do what you want would be to print your lines at once using str.join (also: note that all your data are strings, so no need to convert to string)

for row in table:
    print("\t".join(row))

if you have integers/floats that wouldn't work so:

for row in table:
    print("\t".join(map(str,row)))

the nice touch with join is that it doesn't add a (useless) \\t at the end of the string and you don't have to handle that manually.

But you can do it in an even simpler way using csv module (even with lists of lists of non-strings), in one line:

import csv,sys

csv.writer(sys.stdout,delimiter="\t").writerows(table)