Generator question

[Victor Eijkhout]

So I have a generator, either as a free function or in a class and I
want to generate objects that are initialized from the generated things.

def generator():
for whatever:
yield something
class Object():
def __init__(self):
self.data = # the next thing from generator

I have not been able to implement this elegantly. For external reasons
the following syntax is unacceptable:

for g in generator():
ob = Object(g)

I really want to be able to write "Object()" in any location and get a
properly initialized object.

Hints appreciated.

Victor.

 

[Emile van Sebille]

On 12/22/2010 3:15 PM Victor Eijkhout said...

So I have a generator, either as a free function or in a class and I
want to generate objects that are initialized from the generated things.

def generator():
for whatever:
yield something
class Object():
def __init__(self):

How about change to

def __init__(self, data=generator()):

self.data = # the next thing from generator

then...

self.data = data.next()# the next thing from generator

HTH,

Emile

 

[Dan Stromberg]

So I have a generator, either as a free function or in a class and I
want to generate objects that are initialized from the generated things.

def generator():
       for whatever:
               yield something
class Object():
       def __init__(self):
               self.data = # the next thing from generator

I have not been able to implement this elegantly. For external reasons
the following syntax is unacceptable:

for g in generator():
       ob = Object(g)

I really want to be able to write "Object()" in any location and get a
properly initialized object.

Hints appreciated.

Victor.

You likely want a class variable:

#!/usr/bin/python

def generator():
i = 0
while True:
yield i
i += 1

class Object:
gen = generator()

def __init__(self):
self.data = Object.gen.next()

def __str__(self):
return str(self.data)

o1 = Object()
o2 = Object()
o3 = Object()

print o1
print o2
print o3

 

[Victor Eijkhout]

You likely want a class variable:

Sounds like an elegant solution. Thanks!

Victor.

 

[Nobody]

def generator():
i = 0
while True:
yield i
i += 1

Shorter version:

from itertools import count as generator