How to fetch username and password from excel one by one to test login functionality in robot framework-selenium-python

I am trying to login to my application one by one using different credentials in robot framework-python-selenium but it is not working. Below is my code.
Please suggest.

Open Browser ${URL} chrome
Input Text id=username ${user}
Input Text id=password ${password}
${exp_row_count} get element count ${PATH_EXCEL}sheet1
${exp_row_count} evaluate ${exp_row_count}-1
For ${i} IN RANGE 1 ${exp_row_count}

*** Variables ***
${user} ${i}
${password} ${i}
${PATH_EXCEL} C:UsersTestLogin.xlsx
${i}

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