how to print out each single char from a string in HEX format?

Mon, 04 Jun 2007 16:07:50 -0700 

guys,

I've researched python pretty much but still have no idea how to print
out each single character from a string in HEX format? Hope someone
can give me some hints. Thanks a lot.

e.g.    ###here is a string

          a='01234'

          ###how to print out it out in this way

          0x31 0x31 0x32 0x33 0x34

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