arrays - How to access a column(or row) in a list of lists in python

OK, we have like that list:

ListOfList = [ ['abcd',1], ['efgh',2], ['ijkl',3]]
print(ListOfList)

Let access list in list.

print('row 0', [row[0] for row in ListOfList] )
print('row 1', [row[1] for row in ListOfList] )

Very easy isn't it?
Enjoy~!

python element in list and element no in list, simple example

element in list

if 2 in [1, 2, 3]:
    print('2 in list')
else:
    print('2 in not list')


if 4 in [1, 2, 3]:
    print('4 in list')
else:
    print('4 in not list')


if (1,2) in [(1, 2) , (3, 2)]:
    print('(1,2) in list')
else:
    print('(1,2) in not list')

result



element no in list

if 4 not in [1, 2, 3]:
    print('4 not in list')
else:
    print('4 in list')


if (1,2) not in [(1, 2), (3, 2)]:
    print('(1,2) in not linst')
else:
    print('(1,2) in list')

result

TensorFlow Basic, print tf.Variable, ^^

All things start from the session

import tensorflow as tf

#define a variable to hold normal random values
normal_rv = tf.Variable( tf.truncated_normal([10,10],stddev = 0.1))

#initialize the variable
init_op = tf.initialize_all_variables()

#run the graph
with tf.Session() as sess:
    sess.run(init_op) #execute init_op
    #print the random values that we sample
    print (sess.run(normal_rv)

or

import tensorflow as tf

def create_weights(shape):

    return tf.Variable(tf.truncated_normal(shape, stddev=0.1))

weights = create_weights(shape=[10,10])
init_op = tf.initialize_all_variables()

#run the graph
with tf.Session() as sess:
    sess.run(init_op) #execute init_op
    #print the random values that we sample

    print (sess.run(weights))

reference : https://stackoverflow.com/questions/33633370/how-to-print-the-value-of-a-tensor-object-in-tensorflow

Removing duplicates in lists using set, python

Simple example using set


>>> t = [1, 2, 3, 5, 6, 7, 8]
>>> t = t + [1]

>>> t = t + [2]

>>> t = [1, 2, 3, 1, 2, 5, 6, 7, 8]
>>> t
[1, 2, 3, 1, 2, 5, 6, 7, 8]
>>> list(set(t))
[1, 2, 3, 5, 6, 7, 8]
>>> s = [1, 2, 3]
>>> list(set(t) - set(s))
[8, 5, 6, 7]

reference : https://stackoverflow.com/questions/7961363/removing-duplicates-in-lists

Python: Split string with multiple delimiters [duplicate]

String split using delimiter

let's see how to split string using delimiter

There are 2 issues those are single delimiter and multi delimiters.

import re
#single delimiter
inputStr = 'This\nis\nmy\ndesk.'
split_inpuStr = inputStr.split('\n')
print('single',split_inpuStr)

#double delimiters
inputStr2 = 'This\r\nis\nmy\ndesk.'
split_inpuStr2 = re.split('\r\n|\n', inputStr2)
print('double',split_inpuStr2)

#multi delimiters
a = 'Beautiful,is; better*than\nugly'
b = re.split('; |, |\*|\n',a)
print('multi',b)

reference

https://stackoverflow.com/questions/4998629/python-split-string-with-multiple-delimiters
https://stackoverflow.com/questions/10393157/splitting-a-string-with-multiple-delimiters-in-python

python regular auto generator
http://ss2r.marearts.com

Django queryset simple tutorial

I have 4 objects in my table. The table name is 'Post'.



In models.py, the db class is like that:

class Post(models.Model):
    author = models.ForeignKey('auth.User')
    title = models.CharField(max_length=200)
    text = models.TextField()
    created_date = models.DateTimeField(
            default=timezone.now)
    published_date = models.DateTimeField(
            blank=True, null=True)

    def publish(self):
        self.published_date = timezone.now()
        self.save()

    def __str__(self):
        return self.title

So, let's train how to access the db and handle this.
Above all, you have to makemigrations, migrate after adding the db class code.

>python manage.py makemigrations
>python manage.py migrate

----
OK, train to the QuerySet (we call the dango query as QuerySet),
input this command in the console.
>python manage.py shell


OK, so now let's see the some commands
I will introduce very simple and useful commands.

1. show all objects

>from webapp.models import Post
: db import
>Post.objects.all()

2. access specific object

- first object
>Post.objects.all().first()
- last object
>Post.objects.all().last()
- 3rd object
>Post.objects.all()[2]

very easy right? 😴

3. element value change in object and save

> obj = Post.objects.all()[2]
>obj.title = 'a_title_3'
>obj.save()

4. object add and save

>>> from blog.models import Blog
>>> b = Blog(name='Beatles Blog', tagline='All the latest Beatles news.')
>>> b.save()

5. Checking for empty queryset in Django

if table_name.objects.all().count() == 0:
     print('none')

6. auto increase primary field

id = models.AutoField(primary_key=True)

7. Query datetime by today, yesterday's date 

visitor table class is like that:

class visitor_ss2r(models.Model):
    id = models.AutoField(primary_key=True)
    count = models.PositiveIntegerField(default=0)
    day_visiting = models.DateField(auto_now=True)

today search

(notice!) import datetime 

visitor.objects.get(day_visiting=datetime.date.today())
or
visitor.objects.filter(day_visiting=datetime.date.today()).count()

yesterday search

today = datetime.date.today()
yesterday = today - datetime.timedelta(days = 1)
visitor.objects.get(day_visiting=today)
or
visitor.objects.filter(day_visiting=yesterday).count()

8. object delete

outdated_day = today - datetime.timedelta(days = 30)
obs = visitor_ss2r.objects.filter(day_visiting=outdated_day)
if len(obs) > 0:
    obs.delete()

9. admin page DB field view

Add def __str__(self): .....  show below code!

class visitor_ss2r(models.Model):
    id = models.AutoField(primary_key=True)
    count = models.PositiveIntegerField(default=0)
    day_visiting = models.DateField(auto_now=True)

    def __str__(self):
        return 'Date: ' + str(self.day_visiting)

then you can see like that in admin page


more detail
in admin.py, we can make column list like that:

class visitor_ss2r_Admin(admin.ModelAdmin):
    list_display = ('id', 'count', 'day_visiting')
admin.site.register(visitor_ss2r, visitor_ss2r_Admin)

R. reference

Fastest way to get the first object from a queryset in django?https://stackoverflow.com/questions/5123839/fastest-way-to-get-the-first-object-from-a-queryset-in-django

Making queries¶ (Django officials page)
https://docs.djangoproject.com/en/2.0/topics/db/queries/