Python：如果列表同时包含数字和字符串，如何排序？

Question

In my list, I had a mix of number and strings and the sort() doesn't not work on it, unfortunately. Any look around for this?

Please help.

myList = ['rohit', 'mandiwal', 32, 7701]

TypeError: '<' not supported between instances of 'int' and 'str'

Answer 1

Use a sort key that creates a tuple that places strings or numbers first without having to compare them directly.

Method: In each tuple, numbers have a 0 for the 1st element, strings have a 2.

This keeps numbers and string from being compared and places numbers first. Can reverse this by making numbers 1 and strings 0.

myList = ['rohit', 'mandiwal', 32, 7701, 3.5]
result = sorted(myList, key = lambda x: (isinstance(x, str), x))
print(result)

Simplified key with tip from @StefanPochmann

Output

3.5, 32, 7701, 'mandiwal', 'rohit']

Answer 2

Convert your list into two sorted sub-lists, one containing numbers (ints and floats) and the other containing everything else. Return the combined result.

myList = ['rohit', 'mandiwal', 32, 7701, 3.5]
result = (
    sorted(n for n in myList if isinstance(n, (int, float))) 
    + sorted(word for word in myList if not isinstance(word, (int, float)))
)
>>> result
[3.5, 32, 7701, 'mandiwal', 'rohit']

Answer 3

If you want the list to sorted alphabetically by treating each element as a string, then use sorted(myList, key=str) . The basic idea is to use a key function to transform each list element into a value whose type supports comparison while the transformation enables the required sort ordering.