This is a shortcut that allows you to pass multiple arguments to a function directly list. source: http://stackoverflow.com/questions/36901/what-does-double-star-and-star-do-for-python-parameters
TABLE(*[TR(*rows) for rows in table]) TABLE is a function that can takes list argument. [TR(*rows) for rows in table] is a list. 31 Ağustos 2015 Pazartesi 23:33:23 UTC+3 tarihinde Mamisoa Andriantafika yazdı: > > Thank you for your highlight. You helped me to better understand the > iteration. > > My main misunderstanding was actually the "*" before the "[(TR" ? > > Le lundi 31 août 2015 01:07:47 UTC+2, Anthony a écrit : >> >> [TR(*rows) for rows in table] is a list comprehension -- it iterates >> over the items in "table" (which are themselves lists) and creates a new >> list of TR objects. >> >> The "*" before the list is Python syntax for argument unpacking, treating >> each item in the list as if it were a separate positional argument. >> >> Note, technically argument unpacking is not necessary for TABLE nor for >> TR, as both will alternatively accept a list as the first argument. So, the >> code could be changed to: >> >> TABLE([TR(row) for row in table]) >> >> >> Anthony >> >> On Sunday, August 30, 2015 at 1:20:38 PM UTC-4, Mamisoa Andriantafika >> wrote: >>> >>> Hi, >>> >>> Could you explain to me how this code works? >>> >>> http://web2py.com/books/default/chapter/29/05/the-views#TABLE--TR--TD >>> >>> >>> table = [['a', 'b'], ['c', 'd']] >>> >>> print TABLE(*[TR(*rows) for rows in table]) >>> <table><tr><td>a</td><td>b</td></tr><tr><td>c</td><td>d</td></tr></table> >>> >>> >>> I do not completely understand how the loop is created there? >>> >>> Thank you for your highlight. >>> >>> Mike >>> >> -- Resources: - http://web2py.com - http://web2py.com/book (Documentation) - http://github.com/web2py/web2py (Source code) - https://code.google.com/p/web2py/issues/list (Report Issues) --- You received this message because you are subscribed to the Google Groups "web2py-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
