Clarification on Python Syntax

Question

I am new to learning python and am hoping to receive a little clarity.

If I have some python code that looks like the following:

for row in my_data:
        for w in row[1:]:

Is that essentially saying:

1. For each row in the my_data.csv
2. For each column, in the current row in the my_data.csv, starting at the second column (Column B)

I am trying to understand more directly what the syntax row[1:] means. I have not successfully found documentation that answers that.

Thanks.