[Python] why pandas in python does not return all the rows from excel sheet?

this is my code and my excel sheet has 1000 rows and 22 columns of data. i want to convert excel to text file. but when i run this, i only get first and line 5 rows and columns of data? how to solve this issue

import pandas as pd
xlsFile = pd.ExcelFile('sample.xlsx')
totalPages= xlsFile.sheet_names
with open('output.txt','w') as textFile:
for page in totalPages:
dataFrame = xlsFile.parse(page)
textFile.write("\nSheet name is:"+page+"\n")
textFile.write(str(dataFrame))
textFile.write('\n')

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