Python: Put comma(s) to numbers

Tuesday, April 15th, 2008
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This script will put commas between each group of three digits number. For example, 1234567 will become 1,234,567.

import re

putComma = lambda x: (",".join(re.findall("\d{1,3}", \
    str(x)[::-1])))[::-1]

print putComma(1234567) # 1,234,567
print putComma(12345678) # 12,345,678
print putComma(123456789) # 123,456,789
print putComma(1212) # 1,212
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