xlsxwriter considering worksheet.write as tuple ???

[M2]

Hello
The program is designed to collect different statistics from servers across the network and populate in excel sheet.
Library : xlsxwriter.0.9.3

Below is the Snip of code being used
#! /usr/bin/python

import xlsxwriter
import os;
import subprocess;
import sys;
import os.path;


workbook=xlsxwriter.Workbook('Turnover_sheet.xlsx');

tools_sheet=workbook.add_worksheet('Citi Tools Verification');

hw_sheet=workbook.add_worksheet('Hardware Verification');

os_sheet=workbook.add_worksheet('OS Verification');

build_spec_sheet=workbook.add_worksheet('Build Specs Verification');

info_sheet=workbook.add_worksheet('Server Handover Info');

stan_sheet=workbook.add_worksheet('Standards');

sup_sheet=workbook.add_worksheet('Support Information');

tools_sheet.write('A3', 'Device Name', table_head);
	
tools_sheet.write('B3', 'Machine Category', table_head);
	
tools_sheet.write('C3', 'OS Platform', table_head);


hw_sheet.merge_range('A1:N1', 'Hardware Information', head);
	
hw_sheet.merge_range('A2:A3', 'Device Name', table_head);
	
hw_sheet.merge_range('B2:B3', 'CPU / vCPU Count', table_head);
	

os_sheet.merge_range('A2:A3', 'Server Name', table_head);
	
os_sheet.merge_range('B2:B3', 'Kdump Config', table_head);
os_sheet.merge_range('C2:C3', 'Grub Config', table_head);
	

info_sheet.write('A1', 'Server Name', table_head);
	
info_sheet.write('B1', 'Serial Number', table_head);
	
info_sheet.write('C1', 'Backup Type', table_head);
	

stan_sheet.write('A1', 'Item', table_head);
	
stan_sheet.write('B1', 'Standard', table_head);
	
stan_sheet.write('C1', 'Comments', table_head);


def data_collection(fqdn,counter):
	counter=int(counter);
	red_counter=(int(counter))-2;
	s_count='A'+str(counter);
	s_r_count='A'+str(red_counter);
	tools_sheet.write(s_count,fqdn,cell_format);
	hw_sheet.write(s_count,fqdn,cell_format);
	os_sheet.write(s_count,fqdn,cell_format);
	info_sheet.write(s_r_count,fqdn,cell_format);
	s_count='D'+str(red_counter);
	sup_sheet.write(s_count,fqdn,cell_format);

I get the following error 
    sup_sheet.write(s_count,fqdn,cell_format);
TypeError: 'tuple' object is not callable

What I do not understand is why is python thinking  sup_sheet.write as tuple.
I tired to debug the program and added the following line
print "\ts_count is ", type(s_count)," and value",s_count,"\n\tfqdn is ", type(fqdn), " and value is ",fqdn,"\n\tcell_format is ", type(cell_format), " and value is ",cell_format,"\n\t sup_sheet is ",type(sup_sheet)," and value is ",sup_sheet,"\n\n\n";

just before 
sup_sheet.write(s_count,fqdn,cell_format);

And I got the following output:
         s_count is  <type 'str'>  and value D2 
        fqdn is  <type 'str'>  and value is  Sample1.xyz.com
        cell_format is  <class 'xlsxwriter.format.Format'>  and value is  <xlsxwriter.format.Format object at 0x1eb3150> 
         sup_sheet is  <class 'xlsxwriter.worksheet.Worksheet'>  and value is  <xlsxwriter.worksheet.Worksheet object at 0x1eac610> 



        s_count is  <type 'str'>  and value D3 
        fqdn is  <type 'str'>  and value is  sample2.xyz.com
        cell_format is  <class 'xlsxwriter.format.Format'>  and value is  <xlsxwriter.format.Format object at 0x1eb3150> 
         sup_sheet is  <class 'xlsxwriter.worksheet.Worksheet'>  and value is  <xlsxwriter.worksheet.Worksheet object at 0x1eac610> 



Traceback (most recent call last):
  File "./turnover_sheet.py", line 398, in <module>
    data_population(str(sys.argv[1]));
  File "./turnover_sheet.py", line 380, in data_population
    data_collection(fqdn,count);
  File "./turnover_sheet.py", line 219, in data_collection
    sup_sheet.write(s_count,fqdn,cell_format);
TypeError: 'tuple' object is not callable

I also saw the sheet populated with the first server and when it went to the second server and while populating it considered
sup_sheet.write as a tuple which makes no sense because the rest of the writes are working fine.

I have no clue why is it doing it ?
Thoughts ?

--
Regards
Mohan Mohta