Using Which Version of Linux

[blah@blah.blah]

ok, i m going to use Linux for my Python Programs, mainly because i 
need to see what will these fork() and exec() do. So, can anyone tell 
me which flavour of linux i should use, some say that Debian is more 
programmer friendly, or shold i use fedora, or Solaris. Because these 
three are the only ones i know of that are popular and free.
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