Python sample discussion of comparing sizes of different objects

The source of all evil:

Fireboo's question (although lambda itself has problems) :

>>> filter( lambda x: x > 2, [ 1, [ 1, 2, 3 ], 2, 3 ] ) 
[[1, 2, 3], 3]

? :

>>> 1 < [ 1 ] 
True 
>>> int < list 
True 
>>> dict < int < list 
True

>>> int < map 
False

And then after a little bit of discussion with Fireboo, yeah

1. Different objects are compared (except number) by type names,

2. Address comparison is used when appropriate comparisons are not supported for objects of the same type

3. List and list, tuple and tuple are compared in lexicographical order

>>> x = 1 
>>> y = [ 1 ] 
>>> type( x ) 
<type 'int'> 
>>> type( y ) 
<type 'list'> 
>>> x < y 
True

>>> type( int ) 
<type 'type'> 
>>> type( list ) 
<type 'type'> 
>>> id( int ) 
505552912 
>>> id( list ) 
505555336 
>>> int < list 
True

>>> type( map ) 
<type 'builtin_function_or_method'> 
>>> type( list ) 
<type 'type'> 
>>> map < list 
True