# Telangana: Pay GHMC Property Tax online

I always used to pay this tax from eseva portal, but now for some reason, this option is no longer available there. Finally I found an alternate place to pay this tax and the convenience fee I was charged (for net banking) was around Rs.5 only.

Goto http://www.ghmc.gov.in/ and look for a “Payments” tab then “Payment” and “Property Tax”.

# Create a Tag field using Django-Select2.

The excellent framework – Select2, have had support for tags for a long time, but Django-Select2 lacked that, until now (version 4.2.0).

Tag fields are very much like any multiple value input field except that it allows users to enter values which does not exist in the backing model. So, that the users can add new tags.

For this purpose few new fields have been added to Django-Select2. They all have the suffix – TagField. Few widgets too have been added to auto configure Select2 Js to run in “tagging mode”.

You can see the full reference in docs – http://django-select2.readthedocs.org/en/latest/ref_fields.html and http://django-select2.readthedocs.org/en/latest/ref_widgets.html.

## Simple tag field implementation example

You can find this code in testapp too.

models.py:-

#!python
class Tag(models.Model):
tag = models.CharField(max_length=10, unique=True)

def __unicode__(self):
return unicode(self.tag)

class Question(models.Model):
question = models.CharField(max_length=200)
description = models.CharField(max_length=800)
tags = models.ManyToManyField(Tag)

def __unicode__(self):
return unicode(self.question)

forms.py:-

#!python
class TagField(AutoModelSelect2TagField):
queryset = Tag.objects
search_fields = ['tag__icontains', ]
def get_model_field_values(self, value):
return {'tag': value}

class QuestionForm(forms.ModelForm):
question = forms.CharField()
description = forms.CharField(widget=forms.Textarea)
tags = TagField()

class Meta:
model = Question

Above I am trying to create a form which the website users can use to submit questions. Things to note in TagField is that it is almost like we use any other AutoModel fields in Django-Select2, except that here we override one new method get_model_field_values().

When users submit a tag field, the usual validation runs, but with a twist. While checking if the provided value exists, if it is found not to exist then the field, instead of raising error, creates that value. However, the library does not know how to create a new value instance, hence it invokes create_new_value() to do that job.

Model version of the tag field already knows that it is dealing with Django models so it knows how to instantiate that, but does not know what values to set for the attributes. So it implements create_new_value() which in-turn invokes get_model_field_values() to get required attribute names mapped to their values.

## Before you continue

One key thing to remember is that unlike other widgets, you ideally should not be using tag widgets with normal Django fields. Django fields do not allow creation of a new choice value. However, if you want tagging support but do not want to allow users to create new tags then you can very much use the tag widget here and pair it up with normal Django fields. However, that may not be a good idea, since then UI would still allow creation of new tags, but on submit the user would get an error.

## Making it better

We can make this better and interesting. A typical tagging system should have the following features.

• Ability to detect misspellings. Peter Norvig’s essay on this is excellent. More information can be found on Stack Overflow.
• Use statistics to order the results. This very much useful when the tag counts ballon up. The statistics could be based on how many tags are frequently used together. Of course when you start a site you would not have any data, in that case for a period of time you can set the algo to only learn.
• Cache frequently used tags. This is a normal optimization technique which is frequently used. A memcache like layer is usually used to cache the DB data, and if the data is not found there, then a DB hit is made.

# Find one’s complement of a decimal number.

One’s complement of a binary number (1001_{2}) is (0110_{2}). That is, we simply flip the bits. This is easy to do in binary. However, if the number is in base 10, then do we do that. Convert that to base 2 then flip the bits and change it back to base 2? Maybe, but if the number is stored in native data types (like int) then we can simply use bitwise not to invert the bits, without any conversion.

In my case it wasn’t so simple. I had a really big number, which had to be stored in BigDecimal. Converting to base 2, back and forth too is very costly. So the efficient algo for that is…

(x’) is the one’s complement of (x) and it has (b) bits, or we are interested in only (b) bits of it.

\begin{align} &x + x’ = 2^{b+1} – 1 \tag{all ones for all b bits} \ &\Rightarrow x’ = 2^{b+1} – 1 – x \ \end{align}

So, the equivalent Java code for the above is…

public static BigDecimal onesComplement(BigDecimal n, int totalBits) {
return new BigDecimal(2).pow(totalBits + 1).subtract(BigDecimal.ONE).subtract(n);
}

If you are one of those unfortunates who need to register their Aadhaar number with your bank to get LPG gas subsidy, but you lost your Aadhaar card or did not receive that, then read on…

About two years back I enrolled for Aadhaar. I never received that, but I did not bother checking, since in those days Aadhaar was mostly like a passing fad. Well, now it is different. We have probably three more months of grace period before this abomination kicks in.

I went to ICICI bank with my e-Aadhaar print out, but they refused to accept that, citing company directive to accept only physical cards. This was done to prevent fraud. I contacted Aadhaar “Customer Care” to request for a duplicate physical card, but was informed that there is no such provision! In fact they have been informed that e-Aadhaar should be accepted in lieu of Aadhaar card.

I had hit a stone wall. The only way I could resolve this by trying to reason with ICICI (my bank). We cannot reason with the Govt., which keep on inventing nasty little things to make our life difficult. I tried sending my concern via https://infinity.icicibank.co.in/web/emailus/jsp/emailUs.jsp but that ended up in internal server error. Nice! (sarcasm)

I let the issue rest for sometime. After reading about the LPG deadline again in the newspapers I shook myself up, and started finding alternative ways to get in touch with ICICI. During my hunt I ended up with the email id of the CEO. I mailed to her my plight and requested her to invent an alternative process for people like us. After all, if the aim is to prevent fraud then there should be other ways too. Also they are our banker who already know so much about us to form an informed likely-hood of fraudulent stunts we may try.

I was pleasantly surprised to hear back from a Senior Manager within one business day. She assured me they will address this. On the second day I got a call from my bank Branch Manager that a new process has been sanctioned and I need to bring my Aadhaar Enrollment slip with me. Yeeaah! The Manager used the Enrollment slip to download my e-Aadhaar from uidai.gov.in directly onto his system. Some form fillings and photocopies of an Id proof and I was done.

So, if you have an account in ICICI then you can use the above process. You might want to directly check with the Branch Manager if the bank employees insist that original Aadhaar card is a must and there is no other way. They may not be informed. This process came into effect on 21st May, 2013.

If you have account in other banks and they do not yet have such a provision then you might want to communicate with the bank senior management. I was informed by a reliable source that the banks received a circular in March of this year from Govt., that e-Aadhaar should be accepted in lieu of original Aadhaar card.

I also got another info that you can download your e-Aadhaar for a maximum of five times. I am not sure how true is this, but I am not keen on testing this myself. 😛

BTW, for your information I will reiterate that – there is no way as of now to request for duplicate Aadhaar card.