List of tuples not sorted numerically in python-CodePudding

When I sort my list of tuples by descending with numerical values with this function :

data.sort(key=lambda tup: tup[1], reverse=True)

I have this order of tuples in my list :

data = [("a", 8001),
        ("b", 8000),
        ("c", 8),
        ("d", 10)]

It's sorted by alphabet and not numerical. 8 > 10 because 8 is greater than first letter of 10 which is 1.

How can I sort my list of tuples by numerical descending order ?

CodePudding user response：

The original code works just fine

>>> data = [("a", 8001),
...         ("b", 8000),
...         ("c", 8),
...         ("d", 10)]
>>>
>>> data
[('a', 8001), ('b', 8000), ('c', 8), ('d', 10)]
>>> data.sort(key=lambda tup: tup[1], reverse=True)
>>>
>>> data
[('a', 8001), ('b', 8000), ('d', 10), ('c', 8)]

CodePudding user response：

Try:

sorted(data, key=lambda x: -int(x[1]))

Output:

[('a', '8001'), ('b', '8000'), ('d', '10'), ('c', '8')]

Actually your initial code looks fine, you only need to convert to int like:

data.sort(key=lambda tup: int(tup[1]), reverse=True)