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I needed to sort a list of 2-element tuples by their 2nd elements. I
couldn't see a ready-made function around to do this, so I rolled my
own:<br>
<br>
<tt>
==========================================================
<br>
def sort_tuple_list_by_2nd_elements(alist):<br>
"""<br>
Return a list of 2-element tuples, with the list <br>
sorted by the 2nd element of the tuples.<br>
"""<br>
e0_list = []<br>
e1_list = []<br>
<br>
for e in alist:<br>
e0_list.append(e[0])<br>
e1_list.append(e[1])<br>
e1_list_sorted = sorted(e1_list)<br>
<br>
alist_sorted_by_e1 = []<br>
for i, e0 in enumerate(e1_list_sorted):<br>
alist_sorted_by_e1.append((e0_list[i], e0))<br>
return alist_sorted_by_e1<br>
<br>
if __name__ == '__main__':<br>
colors = [('khaki4', (139, 134, 78)), ('antiquewhite',
(250, 235, 215)), ('cyan3', (0, 205, 205)), ('antiquewhite1', (238, 223,
204)), ('dodgerblue4', (16, 78, 139)), ('antiquewhite4', (139, 131,
120)), ]<br>
<br>
print sort_tuple_list_by_2nd_elements(colors)<br>
<br>
"""<br>
OUTPUT:<br>
[('khaki4', (0, 205, 205)), ('antiquewhite', (16, 78, 139)), ('cyan3',
(139, 131, 120)), ('antiquewhite1', (139, 134, 78)), ('dodgerblue4',
(238, 223, 204)), ('antiquewhite4', (250, 235, 215))]<br>
"""<br>
==================================================================<br>
</tt>It works, but did I really need to roll my own? I think I wouldn't
have had to if I understood what arguments to use for either of the
built-ins, sort() or sorted(). Can someone give me a clue?<br><br>
BTW what list comprehension would have accomplished the same thing as my
function?<br><br>
Thanks,<br><br>
Dick Moores<br>
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