Check max length of array element in Python

Question

I want to check the max length of array elements. Although I can do it with simple code, is there another smart way to implement this in Python 3?

a = [[1,2], [1], [2,2,3,3], [2,2]]
max_len = 0
for d in a:
    max_len = len(d) if len(d) > max_len else max_len
print(max_len)

Possible duplicate of [Python's most efficient way to choose longest string in list?](http://stackoverflow.com/questions/873327/pythons-most-efficient-way-to-choose-longest-string-in-list) — Keerthana Prabhakaran, Mar 16 '17 at 07:16

score 11 · Accepted Answer · answered Mar 16 '17 at 07:02

11

You can do something like this:

max_len = max([len(i) for i in a])
print(max_len)

answered Mar 16 '17 at 07:02

Mathias711

score 8 · Answer 2 · edited Mar 16 '17 at 07:09

8

You can use the inbuilt max function:

>>> a = [[1,2], [1], [2,2,3,3], [2,2]]
>>> len(max(a, key=len))
4

edited Mar 16 '17 at 07:09

Mathias711

answered Mar 16 '17 at 07:03

Hackaholic

2 Answers2