Thank you Alan and Danny. It amazes me at the lengths you guys, as well as
everyone else who contributes, will go to to help explain things to us; it is
greatly appreciated!
Alan, I decided to dumb down the learning classes just a little. By this I
mean, I am not using Tkinter to learn classes. I am using one of the examples
from your website, which I did change it just a little. I figured, I am having
a hard time wrapping my head around classes and Tkinter would just add to the
confusion.
So, I have the below code. When I run this from terminal, it obviously prints
"This is a test." If I may, break the code down and ask questions as it
pertains to the code?
#################
class Message:
def __init__(self, aString):
self.text = aString
def printIt(self):
print self.text
m = Message("This is a test")
m.printIt()
##################
With the first part...
class Message:
def __init__(self, aString):
self.text = aString
Will I always use "_init_" when defining the first function in a class? I
noticed on your website, you created a class where you did not use "_init_"
(see below). Was this because you did not define a function?
class BalanceError(Exception):
value = "Sorry you only have $%6.2f in your account"
I noticed that I can change "text" to anything and I still get the same results
by running the code; I changed them to "blah" just as a test.
When I define a function in a class, will I always use "self" as the first
entry in the parenthesis?
On the next part...
m = Message("This is a test")
m.printIt()
I noticed I cannot run "printIt()" unless I make it an object i.e. "m =
Message("This is a test")...?"
I noticed I could change "m = Message("This is a test")" to "m =
Message(raw_input())," which works.
What if I wanted to create a function in Message that receives text from
another function and then prints that text instead of the text from "m =
Message("This is a test")...; can I pass or return values to another function
inside a class? The"self" is really throwing me off, when I think about
creating different functions that do misc things just to practice. For example,
I have a function that kills a Linux program. I just don't see how to rethink
that function to where it could be defined in a class?
def kill_proc(process1):
i = psutil.Popen(["ps", "cax"], stdout=PIPE)
for proc in psutil.process_iter():
if proc.name(process1):
proc.kill()
Would it be something like...?
class processKiller:
def _init_(self):
def kill_proc(self, process1):
i = psutil.Popen(["ps", "cax"], stdout=PIPE)
for proc in psutil.process_iter():
if proc.name(process1):
proc.kill()
Then outside of the class, call it like so...?
p = processKiller()
p.proc.kill()
Again, I am just practicing, trying to wrap my head around classes and
understand how to create and use them.
Oh yeah, Alan I preordered your new book maybe a month or so ago. Any word on
when it will be released and shipped?
Again, thanks.
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