Question

I’m porting a piece of Ruby to Python. I’ve ported the majority of the code except the following. I can’t really figure out what it does.

the variable rest would be a string representing a phone number. Its only really the

country_handler = splitter_mapping[i][presumed_cc]

Which I find confusing. I realise I could probably use kwargs in python but I’m not really sure.

Any ideas?

module Phony

  class CountryCodes

    attr_reader :splitter_mapping

    def split_cc rest
      presumed_cc = ''
      1.upto(3) do |i|
        presumed_cc << rest.slice!(0..0)
        country_handler = splitter_mapping[i][presumed_cc]
        return [country_handler, presumed_cc, rest] if country_handler
      end
      # This line is never reached as CCs are in prefix code.
    end

Answer 1

Well, from the code and Frederick Cheung’s comment, I think a translation would go something like this:

def slit_cc(rest):
    for i in range(1, 4): # country_code size
        presumed_cc = rest[0:i]
        country_handler = splitter_mapping[i].get(presumed_cc):
        if country_handler:
            return [country_handler, presumed_cc, rest]

    return None # shouldn't happen

splitter_mapping appears to be a dictionary of dictionaries. The first level keys are country_code sizes (string length), and the second level keys are country codes. The values seem to be a country’s telephone dialing prefix.