x = "012345"
s = x[0:3]       # s contains "012"
s = x[:3]        # same thing (using default)
s = x[4:]        # s contains "45"
s = x[1:4]       # s contains "123"
s = x[-5:-2]     # same thing using negative indices
s = x[-2:99]     # s contains "45" - negative index from end of
                 # string allowed, as is index outside string (99)
s = x[::2]       # s contains "024"
s = x[1::2]      # s contains "135"
s = x[1:4:2]     # s contains "13"
s = x[1:5:2]     # s contains "13"
s = x[1:6:2]     # s contains "135"
s = x[-1::-2]    # s contains "531"
s = x[::-2]      # same thing (using default)
s = x[::-1]      # s contains "543210" (i.e. string reverse)
s = x[::0]       # "ValueError: slice step cannot be zero"

##</code><code>##

n=99
z=lambda:`n or 99`+" bottle"+"s of beer on the wall"[n==1:]
while n:y=z();n-=1;print"%s, %s.\n"*2%(y,y[:-12],n and"Take one down and pass it around"or"Go to the store and buy some more",z())

##</code><code>##

n and"Take one down and pass it around"or"Go to the store and buy some more"

##</code><code>##

"Take"if n else"Go to"
(n>0)*"Take"or"Go to"
["Go to","Take"][n>0]
("Go to","Take")[n>0]
n and"Take"or"Go to"
"GToa kteo"[n>0::2]          # "Slice and Dice" wins this golf!

##</code><code>##

99 bottles of beer on the wall,<space>
99 bottles of beer.\nTake one down and pass it around,<space>
98 bottles of beer on the wall.\n\n

##</code><code>##

i=298
while~-i:print i/3or 99,'bottle'+'s of beer on the wall.\n\n'[2<i<6:9+i%3*12]+'..\n\nGToa kteo  otnhee  dsotwonr ea nadn dp absusy  isto maer omuonrde,,'[(i>3)+i%3*68::2],;i-=1

##</code><code>##

'..\n\nGToa kteo  otnhee  dsotwonr ea nadn dp absusy  isto maer omuonrde,,'[(i>3)+i%3*68::2]

##</code><code>##

i=298
while~-i:print i/3or 99,'bottle'+'s of beer on the wall'[2<i<6:9+i%3*14]+('.\n'+'GToa kteo  otnhee  dsotwonr ea nadn dp absusy  isto maer omuonrde,,'[i>3::2],',','.\n\n')[i%3],;i-=1

##</code><code>##

i=298
while~-i:print i/3or 99,'bottle'+'s of beer on the wall.\n\n'[2<i<6:9+i%3*12]+'.X\n.G\noT atkoe  tohnee  sdtoowrne  aanndd  pbausys  siotm ea rmoourned,,'[3%i+i%3*68::2],;i-=1

##</code><code>##

i=297
while i:print-~i/3or 99,'bottle'+'s of beer on the wall.\n\n'[1<i<5:i%3*14^21]+'..\n\nGToa kteo  otnhee  dsotwonr ea nadn dp absusy  isto maer omuonrde,,'[i%3-2^-72|2%i::2],;i-=1

##</code><code>##

print~$_/3|0||99," bottle",substr("s of beer on the wall.

X",6/$_%2,-4**($_%3)),(", ",$_<-4?".
Take one down and pass it around, ":".
Go to the store and buy some more, ")[$_%3-3]for-299..-3

##</code><code>##

print-$_/3|0||99," bottle",("s"," of beer"," on the wall",".

")[5/$_%2..-$_%3+1],($_<-3?".
Take one down and pass it around, ":".
Go to the store and buy some more, ",", ")[-$_%3]for-298..-2

##</code><code>##

298.downto(2){|i|$><<i/3%-99+99<<" bottle"+"s of beer on the wall.

"[5/i%i..8+i%3*12]<<[i>3?".
Take one down and pass it around, ":".
Go to the store and buy some more, ",", "][i%3]}

##</code><code>##

298.downto(2){|i|$><<i/3%-99+99<<" bottle"+"s of beer on the wall.

"[5/i%i..8+i%3*12]<<".
Go to the store and buy some more, .
Take one down and pass it around, "[3%i*25/2+i%3*34,37]}

##</code><code>##

eval"$><<%{#{a=b='#{n} bottl#{"es"[0,n]} of beer',' on the wall'}, #{b}.
\#{0<(n-=1)?'Take one down and pass it around':(n=99;'Go to the store and buy some more')}, #{a}.

};"*n=99

##</code><code>##

eval %{puts"#{a='#{n} bottle#{n>1?:s:p} of beer on the wall'}, #{a[0,30]}.
\#{(n-=1)<1?(n=99;'Go to the store and buy some more'):'Take one down and pass it around'}, #{a}.

"
}*n=99

##</code><code>##

$_="Take one down and pass it around, #{~/s/;c=4-$.-=1," bottle#$& of beer"," on the wall"}.

#{c}, %s%s.
#$_"%c until/, 99\D+/;puts$'+"Go to the store and buy some more"+$&

##</code><code>##

"Go to the store and buy some more"+(-99..-1).map{|n|", #{b=-n," bottles"[0,6-n]+" of beer"," on the wall"}.

#{b}, %s%s.
"%b}*"Take one down and pass it around"=~/

/;puts$'+$`

##</code><code>##

# Based on emiltin.
eval"$><<%{#{a=b='#{n} bottl#{"es"[0,n]} of beer',' on the wall'}, #{b}.
\#{0<(n-=1)?'Take one down and pass it around':'Go to the store and buy some more'%n=99}, #{a}.

};"*n=99

##</code><code>##

# Based on J-_-L.
eval"$><<%{#{a=b='#{n} bottle#{n>1?:s:p} of beer',' on the wall'}, #{b}.
\#{(n-=1)<1?'Go to the store and buy some more'%n=99:'Take one down and pass it around'}, #{a}.

}
"*n=99

##</code><code>##

/s/until@c=(@b=(++$n,bottle.$&,of,beer),on,the,wall),s/^/Take one down and pass it around, @c.

@c, @b.
/,/, 99\D+/;print$'."Go to the store and buy some more$&"

##</code><code>##

$_="Take one down and pass it around, #{~/s/;c=4-$.-=1," bottle#$& of beer"," on the wall"}.

#{c}, %s%s.
#$_"%c until/, 99\D+/;puts$'+"Go to the store and buy some more"+$&

##</code><code>##

i=298
while~-i:print i/3or 99,'bottle'+'s of beer on the wall.\n\n'[5/i%i:i%3*28^9]+'.X\n.G\noT atkoe  tohnee  sdtoowrne  aanndd  pbausys  siotm ea rmoourned,,'[i%3*69^3%i::2],;i-=1