In Python, if you have a list or tuple, you can precede it with an "*" and pass it as an argument to a function, and the function will treat it as if each item in the list were passed as a separate positional argument (same thing for preceding a dictionary with "**", which will treat the dictionary as a set of separate keyword arguments).
In this example, 'rows' is a list, so TR(*rows) is like doing TR(rows[0],rows[1]). In this case, it's not much shorter, but the *rowssyntax is handy when rows contains many elements, especially when the number of elements is determined dynamically (e.g., with a database select). [TR(*rows) for rows in table] is a list comprehension, which results in a list of TR objects, so the "*" preceding it is equivalent to: TABLE(TR(table[0][0],table[0][1]),TR(table[1][0],table[1][1])) Anthony On Tuesday, September 13, 2011 1:10:24 PM UTC-4, Ramos wrote: > > Hello, i dont understant quite well how to interpret the *** in this > code: > > > table = [['a', 'b'], ['c', 'd']] > 2 >>> print TABLE(***[TR(***rows) for rows in table]) > 3 <table><tr><td>a</td><td>b</td></tr><tr><td>c</td><td>d</td></tr></table> > > Can someone please have the kindness to better understand it > > I read the book but still not get it > > > > thank you >
