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blocks.py
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blocks.py
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"""
A decorator to use Python functions in a way similar to Ruby blocks.
=========
Missing
=========
* Implement some default ruby ones
* Add doctests
* Organize in different files. (decorators.py, defaults.py)
"""
import types
def receive_block(func):
def decorator(*args):
if len(args) == 1:
block, = args
instance = None
elif len(args) == 2:
instance, block = args
# Add block to globals
scope = func.func_globals #globals()
scope.update({'block':block})
#create the function with the new scope
new_func = types.FunctionType(func.__code__, scope)
if instance:
return new_func(instance)
else:
return new_func()
return decorator
@receive_block
def external():
for i in [1,2,3]:
print block()
print "External"
@external
def _():
return "a"
@receive_block
def param_external():
for i in [1,2,3]:
print block(i)
print "External with param"
@param_external
def _(i):
return "a " + unicode(i)
class Array(list):
@receive_block
def each(self):
for i in self:
print block(i)
@receive_block
def collect(self):
for (i, value) in enumerate(self):
self[i] = block(value)
@receive_block
def handled(self):
for i in self:
try:
block(i)
except:
print "This raised an exception"
a = Array([1,2,3,4])
print "Each Square"
@a.each
def _(x):
return x**2
print "Each"
@a.each
def _(x):
return x
print "Collect"
@a.collect
def _(x):
return x**2
print a # a is changed
print "Handled"
@a.handled
def _(x):
if x != 9:
raise Exception("this won't work")
else:
print "this works"