RE: Python: Making A Program Run A Function That Is Not Hard Coded

  • From: "Ken Perry" <whistler@xxxxxxxxxxxxx>
  • To: <programmingblind@xxxxxxxxxxxxx>
  • Date: Thu, 2 Dec 2010 19:05:53 -0500

Nod normally I would have ran a default function or just printed an error I
just skipped it here because well it's a test program.

 

Ken

 

From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of qubit
Sent: Thursday, December 02, 2010 3:35 PM
To: programmingblind@xxxxxxxxxxxxx
Subject: Re: Python: Making A Program Run A Function That Is Not Hard Coded

 

Hi Ty --

I disagree about the try block -- try blocks are defined to assist in error
recovery. The sample code Ken sent maybe skips the exceptions, but you could
change that by adding handlers for the various exceptions.

Just musing.

--le

 

----- Original Message ----- 

From: Littlefield, Tyler <mailto:tyler@xxxxxxxxxxxxx>  

To: programmingblind@xxxxxxxxxxxxx 

Sent: Thursday, December 02, 2010 1:48 PM

Subject: Re: Python: Making A Program Run A Function That Is Not Hard Coded

 

On another note, I wouldn't surround your function call in a try block like
Ken did. That's bad practice and will just mask the errors. If you get
errors, they should generally be dealt with, not hidden. If you do anything
in that function that throws an error, it'll just be skipped because the
call to it was wrapped in a try block.
On 12/2/2010 12:35 PM, Homme, James wrote: 

Hi Ty, 

Can you please explain what you said? 

  

Thanks. 

  

Jim 

  

Jim Homme, 

Usability Services, 

Phone: 412-544-1810. Skype: jim.homme 

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From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Littlefield,
Tyler
Sent: Thursday, December 02, 2010 2:27 PM
To: programmingblind@xxxxxxxxxxxxx
Subject: Re: Python: Making A Program Run A Function That Is Not Hard Coded 

Use Ken's code, not what Jim gave you. Jim's code will add a key and a
return value to the dict where as Ken's will allow you to call the code with
dict['func]()
On 12/2/2010 12:13 PM, Ken Perry wrote: 

That is not my code below. 

ken 

From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Homme, James
Sent: Thursday, December 02, 2010 1:59 PM
To: programmingblind@xxxxxxxxxxxxx
Subject: RE: Python: Making A Program Run A Function That Is Not Hard Coded 

Hi Ken, 

Maybe I'm still not getting it. When I use the code below, the function
doesn't print anything out. 

# A dictionary of functions that could possibly run. 

# Note that we have parentheses in the values because it litterally runs
them as code. 

myfuncs = { "func1" : "func1()", 

                "func2" : "func2()" }  

# Two functions with parameters that we don't use. 

def func1(x = "x"): 

  """Func1: Print something to prove this runs""" 

  print "func 1" 

def func2(x = "x"): 

  """Func2: Print something to prove this runs""" 

  print "func 2" 

# Run the code contained in the first element of the above dictionary. 

myfuncs["func1"] 

raw_input("Press enter to quit") 

Jim 

Jim Homme, 

Usability Services, 

Phone: 412-544-1810. Skype: jim.homme 

Internal recipients,  Read my accessibility blog
<http://mysites.highmark.com/personal/lidikki/Blog/default.aspx> . Discuss
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<http://collaborate.highmark.com/COP/technical/accessibility/default.aspx> .
Accessibility Wiki: Breaking news and accessibility advice
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0Wiki/Forms/AllPages.aspx>  

From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Ken Perry
Sent: Thursday, December 02, 2010 1:10 PM
To: programmingblind@xxxxxxxxxxxxx
Subject: RE: Python: Making A Program Run A Function That Is Not Hard Coded 

Actually I don't know why you guys are dead set on using eveal this is how I
do it and it gives you the ability to add parameters later without changing
the code.  In fact I have used this in all kinds of ways to help sort
functions for weird reasons.  Here is how I do a dictionary of functions. 

def func1(): 

    print "func 1" 

def func2(): 

    print "func 2" 

myFuncs={"s1":func1,"s2":func2} 

myFuncs["s2"]() 

From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Homme, James
Sent: Thursday, December 02, 2010 10:56 AM
To: programmingblind@xxxxxxxxxxxxx
Subject: RE: Python: Making A Program Run A Function That Is Not Hard Coded 

Hi, 

Here is code that uses a dictionary rather than a list. Note that I will
later add the exception code. But this works. 

# A dictionary of functions that could possibly run. 

# Note that we have parentheses in the values because it litterally runs
them as code. 

myfuncs = { "func1" : "func1()", 

                "func2" : "func2()" } 

# Two functions with parameters that we don't use. 

def func1(x = "x"): 

  """Func1: Print something to prove this runs""" 

  print "func 1" 

def func2(x = "x"): 

  """Func2: Print something to prove this runs""" 

  print "func 2" 

# Run the code contained in the first element of the above dictionary. 

eval(myfuncs["func1"]) 

raw_input("Press enter to quit") 

Jim 

Jim Homme, 

Usability Services, 

Phone: 412-544-1810. Skype: jim.homme 

Internal recipients,  Read my accessibility blog
<http://mysites.highmark.com/personal/lidikki/Blog/default.aspx> . Discuss
accessibility here
<http://collaborate.highmark.com/COP/technical/accessibility/default.aspx> .
Accessibility Wiki: Breaking news and accessibility advice
<http://collaborate.highmark.com/COP/technical/accessibility/Accessibility%2
0Wiki/Forms/AllPages.aspx>  

From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Ken Perry
Sent: Thursday, December 02, 2010 10:15 AM
To: programmingblind@xxxxxxxxxxxxx
Subject: RE: Python: Making A Program Run A Function That Is Not Hard Coded 

You don't need the quotes around the func in the dictionary. 

From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Homme, James
Sent: Thursday, December 02, 2010 8:56 AM
To: programmingblind@xxxxxxxxxxxxx
Subject: RE: Python: Making A Program Run A Function That Is Not Hard Coded 

Hi, 

When I try to execute this code, nothing prints to the screen. How do I
debug it? 

myfuncs = { "string1" : "func1", 

                "string2" : "func2" } 

def func1(): 

  print "func 1" 

def func2(): 

  print "func 2" 

  eval(myfuncs["string1"]) 

raw_input("Press enter to quit") 

Thanks. 

Jim 

Jim Homme, 

Usability Services, 

Phone: 412-544-1810. Skype: jim.homme 

Internal recipients,  Read my accessibility blog
<http://mysites.highmark.com/personal/lidikki/Blog/default.aspx> . Discuss
accessibility here
<http://collaborate.highmark.com/COP/technical/accessibility/default.aspx> .
Accessibility Wiki: Breaking news and accessibility advice
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0Wiki/Forms/AllPages.aspx>  

From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Ken Perry
Sent: Thursday, December 02, 2010 8:06 AM
To: programmingblind@xxxxxxxxxxxxx
Subject: RE: Python: Making A Program Run A Function That Is Not Hard Coded 

When I went looking for the best way to do this it turns out that a
dictionary works as a perfect case statement and does all your checking at
the same time. Note if you don't use has_key you will need to put it in a
try block like this: 

MyFuncs={"string1",func1,"string2",func2} 

Def func1(blah): 

  Do something 

Def func2(bla): 

  Do something 

Try: 

  Myfuncs["string1"]("pass in") 

Except: 

  Don't do nothing 

Note I added a parameter just to show it can be done.  Make sure to make the
parameters match if you have parameters all functions must have them or at
least defaults. 

Ken 

From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Homme, James
Sent: Thursday, December 02, 2010 7:55 AM
To: programmingblind@xxxxxxxxxxxxx
Subject: Python: Making A Program Run A Function That Is Not Hard Coded 

Hi, 

I'm trying to be clear about this question, but maybe this can't be done. 

Let's say that you have a list that contains twenty strings. 

Your program reads in a string from a file. 

The string from the file matches one of the strings in your list. 

You want to perform a function that may be associated with that string. 

You don't want to write twenty if statements to see if the string in the
file matches and perform the function associated with that string. 

You want to somehow get the program to see the string and the function
associated with it and just perform it. 

Is this possible? 

Thanks. 

Jim 

Jim Homme, 

Usability Services, 

Phone: 412-544-1810. Skype: jim.homme 

Internal recipients,  Read my accessibility blog
<http://mysites.highmark.com/personal/lidikki/Blog/default.aspx> . Discuss
accessibility here
<http://collaborate.highmark.com/COP/technical/accessibility/default.aspx> .
Accessibility Wiki: Breaking news and accessibility advice
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0Wiki/Forms/AllPages.aspx>  

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--   
   
Thanks,  
Ty  






-- 
 
Thanks,
Ty

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