列表中的列表

Question

I am quite new to Python. I have a list containing some more lists, but only in two dimension (eg List[a][b]). Now for every value [a] I want to access a certain value [b] (10 in this case). For now it would be sufficent to just print every value List[a][10]. I tried:

for rec in List:
    print List[rec][10]

That gives me the error "TypeError: list indices must be integers, not list". However if I just try "print List[0][10]" it gives me the value I want. In my for-Loop isn't rec an integer? How could I solve this problem?

Additional info: I am using Python 2.4.3 to be able to use the shapefile library that lets me access GIS data (my list).

Answer 1

for rec in List:
    print rec[10]

should work.

Answer 2

You need to use:

for rec in List:
    print rec[10]

or

for i range(len(List)):
    print List[i][10]

Answer 3

rec in your case is not an integer, it is the first item of list. For you to use it as an integer you must add range in the for loop, like "for rec in range(0,len(List))"