How to avoid overwriting of cell in excel using python?

Question

I am using python-2.7 and xlsxwriter for writing in excel sheet.

Following is my code...

 workbook = Workbook('D:\S_details.xlsx')
 sheet = workbook.add_worksheet()
 rownum = 2
 colnum = 2
 for a in student_result:
     for r, row in enumerate(student_result):
             for c, col in enumerate(row):
                    bold = workbook.add_format({'bold': 1})
                    sheet.write('A1','Student_ID',bold)
                    sheet.write('B1','Student_Link',bold)
                    sheet.write('C1','Student_Name',bold)
                    sheet.write('D1','Student_Qualification',bold)
                    sheet.write('E1','Student_Address',bold)
                    sheet.write('F1','Student_City',bold)
                    sheet.write('G1','Student_State',bold)
                    sheet.write('H1','Student_Country',bold)
                    sheet.write('I1','Student_Stream',bold)
                    sheet.write('J1','Student_Gender',bold)
                    sheet.write(r,c,col)
                    rownum = rownum + 1
                    colnum = colnum + 1

the code runs well but the very first entry which is retrieved from database is overwritten by the header of each column.

Hence only first entry is overwritten and rest of the entries are visible perfectly.

I am also printing the data before writing it to excel sheet but it is not showing any error nor the records are duplicated or so.

Can anyone please guide where I am going wrong...

Guidance / Help in any form is welcome.

Thank-you in advance :)

Answer 1

There are a few issues with the code example:

• The headers are re-written for every iteration of the inner loop. This part of the code should be outside the loop.
• The for a in student_result loop is unused.
• The row_num and col_num variables are incremented but not used.
• The enumerate() returns a 0 row value which overwrites or is overwritten by the A1, B1 entries in the headers.

Fixing these issues would give something like this:

import xlsxwriter

workbook = xlsxwriter.Workbook('S_details.xlsx')
sheet = workbook.add_worksheet()

# Generate some sample data.
student_result = []
for num in range(1, 11):
    student_result.append([num] * 10)

# Make the columns wider so that the text is visible.
sheet.set_column('A:J', 20)

# Add some formatted headers.
bold = workbook.add_format({'bold': 1})
sheet.write('A1','Student_ID',bold)
sheet.write('B1','Student_Link',bold)
sheet.write('C1','Student_Name',bold)
sheet.write('D1','Student_Qualification',bold)
sheet.write('E1','Student_Address',bold)
sheet.write('F1','Student_City',bold)
sheet.write('G1','Student_State',bold)
sheet.write('H1','Student_Country',bold)
sheet.write('I1','Student_Stream',bold)
sheet.write('J1','Student_Gender',bold)

# Write the data.
for row_num, row_data in enumerate(student_result):
    for col_num, col_data in enumerate(row_data):
        sheet.write(row_num + 1, col_num, col_data)

workbook.close()