Python / scheme implement

[Vent d'Est - East Wind]

Can somebody tell me what s exactly the difference beetween scheme and 
python languages

i m thiking to learn one of them but i m not sure wich one

somebody told me python is better and have much library
somebody told me scheme is much smarter and have nice structure

i also see a project about a scheme/python implementation
here is the url
http://plt-spy.sourceforge.net/home.html
i m not sure what s really but seems cool if someone know more about it 
  or have some concrete exemple  it can be more understable

i m not sure what to do
ps i want programming some open source soft for network with gui


thankx a lot

east wind