玩转千位分隔符输出
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' >>>
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
http://wenzhang.baidu.com/page/view?key=4f73729cefd8af8c-1426633956
[2] How do I add a thousand seperator to a number in JavaScript? [duplicate]
http://stackoverflow.com/questions/9743038/how-do-i-add-a-thousand-seperator-to-a-number-in-javascript
[3] How to print a number with commas as thousands separators in JavaScript
http://stackoverflow.com/questions/2901102/how-to-print-a-number-with-commas-as-thousands-separators-in-javascript