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Date: Tue, 4 Nov 2014 09:05:30 -0600
From: Tim Chase <python.list@tim.thechases.com>
To: Fatih =?UTF-8?B?R8O8dmVu?= <mfthguven@gmail.com>
Subject: Re: generating unique variable name via loops
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On 2014-11-04 05:53, Fatih G=C3=BCven wrote:
> > > for x in range(1,10):
> > >     exec("list%d =3D []" % x)
> >=20
> > Why would you do this?
>=20
> I have a structured and repetitive data. I want to read a .txt file
> line by line and classified it to call easily. For example
> employee1 has a name, a salary, shift, age etc. and employee2 and
> other 101 employee have all of it.=20
>=20
> Call employee1.name or employee2.salary and assign it to a new
> variable, something etc. --=20

This sounds remarkably like a CSV or tab-delimited file.  If so, the
way to do it would be

  import csv
  with open("data.txt", "rb") as f:
    dr =3D csv.DictReader(f)
    for row in dr:
      do_something(row["Name"], row["salary"])


If the file format is more complex, it's often useful to create a
generator to simplify the logic:

  class Person:
    def __init__(self,
        name=3D"",
        salary=3D0,
        shift=3D"",
        ):
      self.name =3D name
      self.salary =3D salary
      self.shift =3D shift
    def various_person_methods(self, ...):
      pass

  def people_from_file(f):
    "build Person objects as you iterate over the file"
    for row in file:
      person =3D Person( ... )
      yield person

  with open("data.txt", "r"):
    for person in people_from_file(f):
      do_something(person)

You can then reuse that generator with multiple files if you need.

-tkc