hi.
if i have a single program file, different class instances can share
information in (at least) two fashions:
1. using instance variables:
class AClass:
def __init__(self):
self.att_1 = 42
self.att_2 = "Hello!"
class AnotherClass:
def __init__(self):
self.att_1 = anInstanceOfACl ass.att_1
anInstanceOfACl ass = AClass()
anInstanceOfAno therClass = AnotherClass()
print anInstanceOfAno therClass.att_1 ### This should print out 42
2. using globals:
class AClass:
def __init__(self):
self.att_1 = 42
self.att_2 = "Hello!"
class AnotherClass:
pass
aGlobalString = "No way."
anInstanceOfACl ass = AClass()
anInstanceOfACl ass.att2 = aGlobalString
anInstanceOfAno therClass = AnotherClass()
anInstanceOfAno therClass.att_1 = aGlobalString
print anInstanceOfACl ass.att2 ### This should output "No way."
print anInstanceOfAno therClass.att_1 ### And this too
----
i admit i prefer the fisrt way to do it. i have tried to make it work
even if the "main program" and each class definition reside in different
files, but i could not make it work:
ma**@172.17.1.2 01:/tmp$ cat AClass.py
class AClass:
def __init__(self):
self.att_1 = 42
self.att_2 = "Hello!"
ma**@172.17.1.2 01:/tmp$ cat AnotherClass.py
class AnotherClass:
def __init__(self):
self.att_1 = anInstanceOfACl ass.att_1
ma**@172.17.1.2 01:/tmp$ cat Main.py
from AClass import *
from AnotherClass import *
anInstanceOfACl ass = AClass()
anInstanceOfAno therClass = AnotherClass()
print anInstanceOfAno therClass.att_1 ### This should print out 42
ma**@172.17.1.2 01:/tmp$ python Main.py
Traceback (most recent call last):
File "Main.py", line 4, in ?
anInstanceOfAno therClass = AnotherClass()
File "/tmp/AnotherClass.py ", line 3, in __init__
self.att_1 = anInstanceOfACl ass.att_1
NameError: global name 'anInstanceOfAC lass' is not defined
ma**@172.17.1.2 01:/tmp$
----
any suggestion?
bye max