how to check values in a dataframe using indexes while iterating through the dataframe code example

Example 1: when iterating through a pandas dataframe using index, is the index +1 able to be compared

for i in range(3):
    print(i)

Example 2: when iterating through a pandas dataframe using index, is the index +1 able to be compared

for i in range(3, 16, 3):
    print(i)

Example 3: when iterating through a pandas dataframe using index, is the index +1 able to be compared

for i in range(1, 8):
    print(i)