[Tutor] 2d list matrix 7 x 75 problem

[Dave S]

Hello,

I need to generate a list 2d matrix of the kind ...

[['', '', '', '', ''], ['', '', '', '', ''], ['', '', '', '', ''], ['', 
'', '', '', ''], ['', '', '', '', '']]

except its dimensions need to be 7 x 75. I thought I had it sorted with

map2 = [ [''] *7 ] *75

until the coding screwed up & I realised I had 75 references to the same 
list :-(

so I thought I would be clever with ...
 >>> a=[0]*5
 >>> a
[0, 0, 0, 0, 0]
 >>> b=[a[:]]*5

same problem.

It seems realy simple but how do I generate a 7 x 75 list matrix ?

Dave




Oh PS

Is there a more elegant solution to

if string == 'sun' or string == 'mon' or string == 'tue' or string == 
'wed' or string == 'thu' or string == 'fri' or string == 'sat':

the above works but any suggestions would be welcome :-)