python ttk treeview sort numbers

问题

I'm trying to use the ttk.Treeview sort function illustrated in the answer to this question (Tk treeview column sort) and it works just fine for strings like 'abc', 'bcd', 'cde', etc., but when I try to sort numbers it ends up showing up like this:

1
10
11
2
3
...

I'd like for the data to be sorted such that the output is:

1
2
3
...
10
11

I know that the values in the treeview columns are strings and that I'm most likely going to need to convert them to integers before sorting, but I can't figure out how to do that.

回答1:

list.sort method, sorted function accept optional key parameter. The return value of the function is used as comparison key.

Specifying key function that convert the treeview item into number will solve your problem.

Example:

try:
    from tkinter import *
    from tkinter import ttk
except ImportError:
    from Tkinter import *
    import ttk

def treeview_sort_column(tv, col, reverse):
    l = [(tv.set(k, col), k) for k in tv.get_children('')]
    l.sort(key=lambda t: int(t[0]), reverse=reverse)
    #      ^^^^^^^^^^^^^^^^^^^^^^^

    for index, (val, k) in enumerate(l):
        tv.move(k, '', index)

    tv.heading(col,
               command=lambda: treeview_sort_column(tv, col, not reverse))

root = Tk()
columns = ('number',)
treeview = ttk.Treeview(root, columns=columns, show='headings')
for t in ('1', '10', '11', '2', '3'):
    treeview.insert('', END, values=(t,))
treeview.pack()
for col in columns:
    treeview.heading(col, text=col,
                     command=lambda c=col: treeview_sort_column(treeview, c, False))

mainloop()

回答2:

I figure I'd add this bit of code for anyone wanting to use the above solution for both regular string sorts and numeric sorts.

def treeview_sort_column(tv, col, reverse):
    l = [(tv.set(k, col), k) for k in tv.get_children('')]
    try:
        l.sort(key=lambda t: int(t[0]), reverse=reverse)
        #      ^^^^^^^^^^^^^^^^^^^^^^^
    except ValueError:
        l.sort(reverse=reverse)

    for index, (val, k) in enumerate(l):
        tv.move(k, '', index)

    tv.heading(col, command=lambda: treeview_sort_column(tv, col, not reverse))        

回答3:

It took me a while to find a variant of this answer, but I thought I would post an answer for those looking to sort dates as a string (i.e. 'DD/MM/YYYY')

import datetime

def treeview_sort_column(tv, col, reverse):
l = [(tv.set(k, col), k) for k in tv.get_children('')]
    l.sort(key=lambda: x, datetime.datetime.strptime(x[0], '%d/%m/%y'), reverse=reverse)

for index, (val, k) in enumerate(l):
    tv.move(k, '', index)

tv.heading(col, command=lambda: treeview_sort_column(tv, col, not reverse))  

来源：https://stackoverflow.com/questions/22032152/python-ttk-treeview-sort-numbers