Re: [Tutor] Using insert method on a list matrix

[Ken Oliver]

try    M[0].insert(0, 'pod') -----Original Message----- From: Raj Medhekar Sent: Jul 19, 2009 7:12 PM To: Python Tutor Subject: [Tutor] Using insert method on a list matrix I would like to know how I could use the insert method in a List matrix eg. for the matrix below M=[[1,2,3], [3,2,1], [4,3,2]] if wanted to insert the string 'pod' in list [0] before [1] in list [0] in M using the built in method insert How would I go about doing this? I've tried may List Comprehension possibilities but none of then worked. Below are some of the things I tried. >>> M=[[1,2,3], [3,2,1], [4,3,2]] >>> M.insert([1][1], 'pod') Traceback (most recent call last):   File "<pyshell#19>", line 1, in <module>     M.insert([1][1], 'pod') IndexError: list index out of range >>> [row[0] for row in M.insert(1, 'pod')] Traceback (most recent call last):   File "<pyshell#20>", line 1, in <module>     [row[0] for row in M.insert(1, 'pod')] TypeError: 'NoneType' object is not iterable >>> M.insert(1,'pod') >>> M [[1, 2, 3], 'pod', 'pod', [3, 2, 1], [4, 3, 2]] >>> M.insert[0](1,'pod') Traceback (most recent call last):   File "<pyshell#23>", line 1, in <module>     M.insert[0](1,'pod') TypeError: 'builtin_function_or_method' object is unsubscriptable Any help is greatly appreciated! Thanks! -Raj .

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