1、Python

1.1 format方法：

2.7版本以上直接用format设置千分位分隔符

Python 2.7 (r27:82500, Nov 23 2010, 18:07:12)

[GCC 4.1.2 20070115 (prerelease) (SUSE Linux)] on linux2

Type "help", "copyright", "credits" or "license" for more information.

>>> format(1234567890,',')

'1,234,567,890'

>>> print 'The value is {:0,.2f}'.format(1234567.125)

The value is 1,234,567.12

>>> print 'The value is {:0,.2f}'.format(1234567.126)

The value is 1,234,567.13

1.2 正则实现：

import re

def strConv(s):

s =  str(s)

while True:

(s,count) = re.subn(r"(\d)(\d{3})((:?,\d\d\d)*)$",r"\1,\2\3",s)

if count == 0 : break

return s

print strConv(12345)

1.3 locale

def number_format(num, places=0):

"""Format a number according to locality and given places"""

locale.setlocale(locale.LC_ALL, "")

return locale.format("%.*f", (places, num), True)

>>> import locale

>>> number_format(12345678.123)

'12,345,678'

>>> number_format(12345678.123, 2)

'12,345,678.12'

>>> import locale

>>> a = {'size': 123456789, 'unit': 'bytes'}

>>> print(locale.format("%(size).2f", a, 1))

123456789.00

>>> locale.setlocale(locale.LC_ALL, '') # Set the locale for your system

'en_US.UTF-8'

>>> print(locale.format("%(size).2f", a, 1))

123,456,789.00

1.4 DIY

>>> s = "1234567890"

>>> s = s[::-1]

>>> a = [s[i:i+3] for i in range(0,len(s),3)]

>>> print (",".join(a))[::-1]

2、Perl

perl -e '$size = "1234567890";while($size =~ s/(\d)(\d{3})((:?,\d\d\d)*)$/$1,$2$3/){};print $size, "\n";'

1,234,567,890

3、Sed

echo 12345|sed -e :a -e 's/\(.*[0-9]\)\([0-9]\{3\}\)/\1,\2/;ta'

12,345

4、Bash

printf "%'d\n" 12345

12,345

5、JavaScript

5.1 Number.prototype.toLocaleString()  方法

parseInt('123456789456.34').toLocaleString()

"123,456,789,456"

5.2 Intl object

Intl.NumberFormat().format(1234.1235);

"1,234.124"

5.3 正则

function addCommas(n){

var rx=  /(\d+)(\d{3})/;

return String(n).replace(/^\d+/, function(w){

while(rx.test(w)){

w= w.replace(rx, '$1,$2');

}

return w;

});

}

addCommas('123456789456.34');

"123,456,789,456.34"

'12345678.34'.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",")

"12,345,678.34"

注：某些方法不支持小数部分或者小数部分四舍五入，请慎用。

6、Refer：

[1] shell、perl、python 千分位 逗号分隔符输出

[2] How do I add a thousand seperator to a number in JavaScript? [duplicate]

[3] How to print a number with commas as thousands separators in JavaScript