Differences from Python

Added by Paul King, last edited by Jacek Pliszka on Dec 06, 2007  (view change)

General

Python Groovy 
repr(x)
 
x.inspect(), x.dump()
 
x.y if x else None
 
x?.y
 
"%(foo)s" % locals()
 
"${foo}"

Lists

Python Groovy 
not x
 
!x
x.empty
 
len(x)
 
x.size()
 
for item, idx in enumerate(x): ...
 
x.eachWithIndex { item, idx -> ... }

Maps

Python Groovy 
{}
 
[:] // an empty map
 
Depends:
d if used like:  for k in d:
list(d) if list needed
d.[iter]keys() explicitly
 
d.keySet()
 
d.[iter]values()
 
d.values()
 
[k+1 for k in d]
 
d.collect { k, v -> k+1 }
 
d = dict(zip(k, v))
 
k = 1..3
v = 'a'..'c'
d = [:]; k.eachWithIndex { it, i -> d[it] = v[i] }
println d // [1:"a", 2:"b", 3:"c"]

Ranges/Slices

Python Groovy 
range(3)
 
0..<3
 
range(1, 3+1)
 
1..3
 
range(0, 10, 2)
 not represented as a data type but you can use 
0.step(10, 2) {...}
 
"abcdef"[3:]
 
"abcdef"[3..-1]

Object access

Python Groovy 
m = 'strip'; getattr(' ! ', m)()
 
m = 'trim'; ' ! '."$m"()
 
args = ('a', 2); 'abcabc'.find(*args)
 
args = ['a', 2]; 'abcabc'.indexOf(*args)

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Comments (1)

 

  1. Aug 24, 2007

    Mike says:

    These examples are wrong:  d.iterkeys()  d.itervalues() k1 for k,v in d.iteritem...

    These examples are wrong: 
    d.[iter]keys()
     d.[iter]values()
    [k+1 for k,v in d.iteritems()]
     
     Should be:
    d.keys()
    d.values()
    [k for k,v in d.items()]