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>>cat a.txt
a=1,befc
a=11,azxv
a=2,azvf
a=231,fffe
a=24,zefg


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a=1,befc
a=2,azvf
a=11,azxv
a=24,zefg
a=231,fffe
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Python code:

import re

file_a = open('a.txt')

pattern = re.compile('a=(\d+),(\w+)')

dict_1 = {}
for line in file_a:
s = pattern.match(line).group(1)
dict_1[int(s)] = line

list_1 = dict_1.keys()
list_1.sort()
for i in list_1:
print dict_1[i]



def my_cmp(a, b ):
    a_value = int(a.lstrip('a=').split(',')[0])
    b_value = int(b.lstrip('a=').split(',')[0])
    return cmp(a_value, b_value)

lines = [ l.strip() for l in open('t.txt') if l.strip() ]

for l in sorted(lines, cmp = my_cmp):
    print l

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http://code.activestate.com/recipes/576755/



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>>cat a.t


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