Python - I used the beautifulsoup. but result value of href is disappeared : this is html

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-html -->

    <div class="s_write">
        <p style="text-align:left;"></P>
        <div app_paragraph="Dc_App_Img_0" app_editorno="0">
        <img src="http://dcimg6.dcinside.co.kr/viewimage.php?id=2fbcc323e7d334aa51b1d3a240&amp;no=24b0d769e1d32ca73fef84fa11d028318f52c0eeb141bee560297996d466c894cf2d16427672bba3d66d67f244141456484ebe788e4b1ac8601ef468abc7cad6754f440d9ddbfc0370c7" style="cursor:pointer;" onclick="javascript:imgPop('http://image.dcinside.com/viewimagePop.php?id=2fbcc323e7d334aa51b1d3a240&amp;no=24b0d769e1d32ca73fef84fa11d028318f52c0eeb141bee560297996d466c894cf2d16427672bba3d66d67f24452490c8b9fb90ae74e4d6a2435010d29956ad37f400586d9cb','image','fullscreen=yes,scrollbars=yes,resizable=no,menubar=no,toolbar=no,location=no,status=no');"></div>

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i want to extract 

<pre>http://image.dcinside.com/viewimagePop.php?id=2fbcc323e7d334aa51b1d3a240&amp;no=24b0d769e1d32ca73fef84fa11d028318f52c0eeb141bee560297996d466c894cf2d16427672bba3d66d67f24452490c8b9fb90ae74e4d6a2435010d29956ad37f400586d9cb
</pre>

so i programming like this


    for link in internal.find_all('div',class_="s_write"):
        print (link)


but result is 

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-html -->

    <div class="s_write"><p style="text-align:left;"><div app_editorno="0" app_paragraph="Dc_App_Img_0"><img src="http://dcimg6.dcinside.co.kr/viewimage.php?id=2fbcc323e7d334aa51b1d3a240&amp;no=24b0d769e1d32ca73fef84fa11d028318f52c0eeb141bee560297996d466c894cf2d16427672bba3d66d67f24452490c8a9dbf0ae34e4a6a20370e5a2d9633d5701c48dc23ac"/></p></div>

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href does not contain at result

what's problem?...