+- Hack Forums (https://hackforums.net)
+-- Forum: Tech (https://hackforums.net/forumdisplay.php?fid=444)
+--- Forum: Coding (https://hackforums.net/forumdisplay.php?fid=151)
+---- Forum: Software Development (https://hackforums.net/forumdisplay.php?fid=118)
+---- Thread: [Python] Single vs multi-dimensional array (/showthread.php?tid=4090696)
Single vs multi-dimensional array - _UserName_ - Mar 1, 2014
Is there any way to programmatically determine if the array you are parsing is a regular array or a two dimensional array?
For example, how would you distinguish:
array1 = ["This", "Is", "A", "Sample", "Array", "."]
from
array2 = [["This", "Is"], ["A", "Sample"], ["Array", "."]]
* - Skyla Blue - Mar 1, 2014
(Mar 1, 2014 03:06 PM)_UserName_ Wrote: Is there any way to programmatically determine if the array you are parsing is a regular array or a two dimensional array?
For example, how would you distinguish:
array1 = ["This", "Is", "A", "Sample", "Array", "."]
from
array2 = [["This", "Is"], ["A", "Sample"], ["Array", "."]]
A really really ghetto way of doing it could be:
Code
if str(array2).count("[") > 1 and str(array2).count("],") > 1:
print "Multi dimensional"
else:
print "One dimensional"* - ImportUsername - Mar 1, 2014
You can use type() to check the type of something. If you check the first item in the list, you can check if it's a list. It the first element of a list is a list, then it is two dimensional. Like this:
Code
ls = [[1,2],[3,4]]
if type(ls[0]) is list:
print ("Is 2D")
else:
print ("Not 2D")* - _UserName_ - Mar 1, 2014
Thanks for the feedback. I'm going to try your way Import. I like the ghetto method btw Skyla Blue.
* - glob - Mar 1, 2014
(Mar 1, 2014 03:33 PM)ImportUsername Wrote: You can use type() to check the type of something. If you check the first item in the list, you can check if it's a list. It the first element of a list is a list, then it is two dimensional. Like this:
Codels = [[1,2],[3,4]]
if type(ls[0]) is list:
print ("Is 2D")
else:
print ("Not 2D")
That or you could use isinstance:
PHP Code
<?php
a = [[1,2,3],[4,5,6]]
print isinstance(a[0],list)
And if you wanted to check if any of the items are a list:
PHP Code
<?php
a = [[1,2,3],[4,5,6]]
print any(map(lambda x:isinstance(x,list),a))
* - _UserName_ - Mar 1, 2014
Is there any reason to use either type or isinstance over the other.
* - ImportUsername - Mar 1, 2014
(Mar 1, 2014 06:42 PM)_UserName_ Wrote: Is there any reason to use either type or isinstance over the other.
Take a look at this: https://stackoverflow.com/questions/1549801/differences-between-isinstance-and-type-in-python
(also maybe try a quick google search next time? 😝)
* - _UserName_ - Mar 1, 2014
The irony is that I posted here and then looked online and found that exact same page. I guess Google is as fast as a forum. 🤣