Python Tkinter Format Number Entry with commas

Question

I would like to know how to convert a number into a formatted "number" format that has commas. I am on Mac OSX. An expression is inputted and evaluated within an entry widget and then output into a label widget with the following function:

def evaluate(self, event):
    data = self.e.get()
    self.ans.configure(text = "Answer: " + str(eval(data)))

I need the resulting output to be in a "number" format. For example, if the output is "34523000", I want it to say "34,523,000".

Answer 1

Use the locale module.

If you are on Ubuntu, you can check the list of your locales by typing locale -a on your Terminal. On my machine, I see a long list from which I choose, for example, 'en_US.utf8'.

Once you have done that, go back to your function and do these changes:

import locale
# ...
# ...
# It is better to run this outside your function:
locale.setlocale(locale.LC_ALL, 'en_US.utf8')
# ...
# ...
def evaluate(self, event):
    entry_data = self.e.get()
    data = locale.format("%d", entry_data, grouping=True)
    # ...
    # ...

Here is a quick demo with the example data you provided:

>>> import locale
>>> locale.setlocale(locale.LC_ALL, 'en_US.utf8')
'en_US.utf8'
>>> locale.format("%d", 34523000, grouping=True)
'34,523,000'