Exec inside a class method to call other class methods?

[Matthew Dubins]

Hello all,

I have made a python script to upload contact information from an excel 
worksheet to an online database.  One part of the program that really 
tripped me up was when I wanted to call specific class methods that I 
had made to deal with specific types of contact information (Parent's 
name, Child's name, Phone #, etc).  My first thought was to make it easy 
using the exec statement. 


The code (a method within a class) looked like this:
--
def parse(self, data, data_type)
   exec "self.__parse_%s(data)" % data_type
--
The data_type variable contains strings that exactly match the spellings 
of the 2nd word in the titles of the class methods that I wanted to call 
for each data_type inputted into the parse function.  For some reason, 
*it didn't work*.  Alternately, I found the ugly code shown below to be 
functional.  As you can see, for each data_type, I call the 
corresponding class method that I've specified.  Please help me to 
transform my ugly functional code into concise functional code. :)


Thanks,
Matthew
--
   def parse(self, data, data_type):
   if data_type == 'nocall':
   self.__parse_nocall(data)
   elif data_type == 'DOB':
   self.__parse_DOB(data)
   elif data_type == 'gender':
   self.__parse_gender(data)
   elif data_type == 'Prematurity':
   self.__parse_Prematurity(data)
   elif data_type == 'email':
   self.__parse_email(data)
   elif data_type == 'languages':
   self.__parse_languages(data)
   elif data_type == 'phone':
   self.__parse_phone(data)
   elif data_type == 'cname':
   self.__parse_cname(data)
   elif data_type == 'pname':
   self.__parse_pname(data)
   elif data_type == 'address':
   self.__parse_address(data)
   elif data_type == 'duedate':
   self.__parse_dudedate(data)

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Re: Exec inside a class method to call other class methods?

[Matthew Dubins]

Each type does contain its own parsing method.  It's just that, as it 
stands, one method is being used to shunt off the data to the correct 
parsing method.


Matthew Dubins

David Stanek wrote:

On Thu, Dec 25, 2008 at 1:22 PM, Matthew Dubins
 wrote:
  

Hello all,

I have made a python script to upload contact information from an excel
worksheet to an online database.  One part of the program that really
tripped me up was when I wanted to call specific class methods that I had
made to deal with specific types of contact information (Parent's name,
Child's name, Phone #, etc).  My first thought was to make it easy using the
exec statement.
The code (a method within a class) looked like this:
--
def parse(self, data, data_type)
  exec "self.__parse_%s(data)" % data_type
--
The data_type variable contains strings that exactly match the spellings of
the 2nd word in the titles of the class methods that I wanted to call for
each data_type inputted into the parse function.  For some reason, *it
didn't work*.  Alternately, I found the ugly code shown below to be
functional.  As you can see, for each data_type, I call the corresponding
class method that I've specified.  Please help me to transform my ugly
functional code into concise functional code. :)

Thanks,
Matthew
--
  def parse(self, data, data_type):
  if data_type == 'nocall':
  self.__parse_nocall(data)
  elif data_type == 'DOB':
  self.__parse_DOB(data)
  elif data_type == 'gender':
  self.__parse_gender(data)
  elif data_type == 'Prematurity':
  self.__parse_Prematurity(data)
  elif data_type == 'email':
  self.__parse_email(data)
  elif data_type == 'languages':
  self.__parse_languages(data)
  elif data_type == 'phone':
  self.__parse_phone(data)
  elif data_type == 'cname':
  self.__parse_cname(data)
  elif data_type == 'pname':
  self.__parse_pname(data)
  elif data_type == 'address':
  self.__parse_address(data)
  elif data_type == 'duedate':
  self.__parse_dudedate(data)




I would look for a way to reorganize your code so that each type
contains its own parse method.


  


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