文字列と配列の変換

Python 2.6.5

ary = ['abc', 'def', '123', '456']
str = 'xyz,opq,987,654'

# 文字列から配列へ
print str.split(',') #=>['xyz', 'opq', '987', '654']

# 配列から文字列へ
','.join(ary)        #=>'abc,def,123,456'

Ruby 1.8.7

ary = ['abc','def','123','456']
str = 'xyz,opq,987,654'

# 文字列から配列へ
print str.split(',') #=>['xyz', 'opq', '987', '654']

# 配列から文字列へ
ary.join(",")        #=>'abc,def,123,456'