Databases
StackOverflow2013
Postsdbo
POUse the _init_ definition in order to initialize an object in Python
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POUse the _init_ definition in order to initialize an object in Python
    primarykey
    data
    text
    <p>I have written an algorithm in Python and now I am trying to make it a bit more object oriented. I have a good understanding (I think) of objects and classes and I have spend some time reading online the syntax for classes in Python. However, I guess my question is quite basic and it would be great to get some help.</p> <p>I have created a Class XML which contains 3 definitions. I also have used <code>__init__</code> to initialize the object.</p> <pre><code> class XML(): def __init__(self,f): self.f = f def xmlToString(self): data = self.f.read() self.f.close() ... return station_arr def exportArray(self): f= open('stations/'+self.STATION+'.txt') lines= f.readlines() ... return phenomena,parameters def calcAvg(self): split_phenom = self.phenomena.split(';') list_of_lists = [] for e in self.parameters: ... return phenomena,parameters </code></pre> <p>Then, in the main.py I instantiate the objects and call the methods I want like this:</p> <pre><code> stations_names ['one', 'two'...] for station in stations_names: f = open('respond.txt','r') xmlStr = ClassXML.XML(f) stations_arr = xmlStr.xmlToString() xmlRead = ClassXML.XML(stations_arr) phenomena,parameters = xmlRead.exportArray() xmlRetr = ClassXML.XML(phenomena,parameters) avg_dict,dict_values = xmlRetr.calcAvg() </code></pre> <p>The error I get is this:</p> <pre><code>f= open('stations/'+self.station+'.txt') AttributeError: XML instance has no attribute 'station' </code></pre> <p>So I understand what is the problem. Some how I have to pass into the class the variable "station". But when I try to included it in the <strong>init</strong> function I get different errors:</p> <pre><code>xmlStr = ClassXML.XML(f) TypeError: __init__() takes exactly 3 arguments (2 given) </code></pre> <p>Then I thought maybe I have to have multiple <strong>init</strong> functions but as far as I know this is not possible in Python. To be honest I don't really know how to handle the problem. Any tip would be useful. </p> <p>Thanks D</p> <p>P.s. I am not sure if the title explains correctly my question, but I can not find any correct words to put it!</p> <p><strong>IMPLEMENTED FINAL ANSWER</strong></p> <pre><code> class XML(): def __init__(self,f,station): self.f = f self.station =station def xmlToString(self): data = self.f.read() self.f.close() ... return station_arr def exportArray(self): f= open('stations/'+self.STATION+'.txt') lines= f.readlines() ... return phenomena,parameters def calcAvg(self,phenomena,parameters): split_phenom = self.phenomena.split(';') list_of_lists = [] for e in self.parameters: ... return avg_dict,dict_values </code></pre> <p>** Main **:</p> <pre><code> for station in stations_names: f = open('respond.txt','r') ## Instantiate class: ClassXmlString xmlStr = ClassXML.XML(f,station) stations_arr = xmlStr.xmlToString() if stations_arr !='': phenomena,parameters = xmlStr.exportArray() avg_dict,dict_values = xmlStr.calcAvg(phenomena,parameters) </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USuser1919
    1. USuser1919
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POUse the _init_ definition in order to initialize an object in Python
      1. This table or related slice is empty.
      1. VTUpMod
    1. COOne question : where did you use `station ` inside `for loop`
      singulars
      1. POUse the _init_ definition in order to initialize an object in Python
      1. USMoj
    2. CO@Moj: I use it in the: exportArray(self) definition in order to specify a path.
      singulars
      1. POUse the _init_ definition in order to initialize an object in Python
      1. USuser1919
    3. CO@Moj: Haven't you tried to set self.STATION somewhere first and then use it in exportArray(self) ?
      singulars
      1. POUse the _init_ definition in order to initialize an object in Python
      1. USDusk
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload