str

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Definition
Create a new string object from the given object.

Syntax
As defined in sidebar.

Parameters
str=string

Examples

Through the QuerySet, the db is diplay through view.py. Only latest object is query in this this example.

mysite/settings

INSTALLED_APPS = (

'django.contrib.admin',

'django.contrib.auth',

'django.contrib.contenttypes',

'django.contrib.sessions',

'django.contrib.messages',

'django.contrib.staticfiles', 'myapp',

)

models.py

from django.db import models

class ModelUrl(models.Model):

url=models.URLField()

def __str__(self):

return self.url

myapp/views.py

from django.shortcuts import HttpResponse

from .models import ModelUrl

def URL_List(request):

model = ModelUrl

context_object_name = 'Url'

url=ModelUrl.objects.latest('id')

string=str(url)

return HttpResponse(string)

mysite/ulrs.py

from django.conf.urls import include, url

from myapp.views import URL_List

urlpatterns = [

url(r'^', URL_List),

]

python manage.py runserver

URLField is created through models and viewed through index.html.

Window CMD commands

virtualenv djangoschool
cd djangoschool
.\Scripts\activate
pip install django
python .\Scripts\django-admin.py startproject mysite
cd mysite
python manage.py startapp myapp
python manage.py syncdb
python manage.py runserver

mysite/setting.py

INSTALLED_APPS = (

'django.contrib.admin',

'django.contrib.auth',

'django.contrib.contenttypes',

'django.contrib.sessions',

'django.contrib.messages',

'django.contrib.staticfiles', 'myapp',

)

mysite/urls.py

from django.conf.urls import include, url

from myapp.views import ViewUrl

urlpatterns = [

url(r'^', ViewUrl)

]

myapp/models.py

from django.db import models

class ModelUrl(models.Model):

url=models.URLField()

def __str__(self):

return self.url

myapp/forms.py

from django import forms

from .models import ModelUrl

class FormUrl(forms.ModelForm):

class Meta:

model=ModelUrl

fields=['url']

myapp/views.py

from django.shortcuts import render

from django.shortcuts import HttpResponseRedirect, HttpResponse

from .forms import FormUrl

def ViewUrl(request):

form=FormUrl(request.POST)

if form.is_valid():

form.save(commit=False)

form.save()

return HttpResponseRedirect('/thanks/')

else:

form=FormUrl

return render(request, 'myapp/index.html',{'form':form})

def response(request):

return HttpResponse("Thanks")

myapp/index.html

<!DOCTYPE html>

<html>

</head>

<body>

{%csrf_token%}

</form>

</body>

</html>

Localhost:8000

Database Query

Examples

The Response returns the union of frozenset x, y.

from wsgiref.simple_server import make_server
from pyramid.config import Configurator
from pyramid.response import Response

def frozenset1(request):
x=frozenset({7,9,11,13})
y=frozenset({5,10,15})
z=frozenset.union(x,y)
z=str(z)
return Response('The union of frozenset is:' + z)

if __name__ == '__main__':
config = Configurator()
config.add_route('set', '/')
config.add_view(frozenset1, route_name='set')
app = config.make_wsgi_app()
server = make_server('0.0.0.0', 1050, app)
server.serve_forever()

The pyramid returns with the requests after finding the number of 'a' in www.pythonlake.com.

from wsgiref.simple_server import make_server

from pyramid.config import Configurator

from pyramid.response import Response

import requests

def find(request):

r=requests.get('http://www.pythonlake.com')

text=r.text

f=text.find('a')

f=str(f)

response = Response()

response.text=f

return response

if __name__ == '__main__':

config = Configurator()

config.add_route('find', '/')

config.add_view(find, route_name='find')

app = config.make_wsgi_app()

server = make_server('0.0.0.0', 6500, app)

server.serve_forever()

concatenation

The method concatenate the strings.

>>> x="python"
>>> y="Lake Learning Center "
>>> x+y
'pythonLake Learning Center'
>>>

str.lower()

The method return the string into lowercase and uppercase.

>>> x="Python Lake"
>>> x.upper()
'PYTHON LAKE'
>>> x.lower()
'python lake'
>>>

str.capitalize()

The method capitalize the string.

>>> "python lake".capitalize()
'Python lake'
>>> "Python Lake".upper()
'PYTHON LAKE'
>>>

operator.is_(str,str)

The operator tested the string values.

>>> operator.is_("Python", "Lake")
False
>>> operator.is_("Python", "Python")
True

a(str) is b(str)

The results are string return positive.

>>> "Python" is "Python"
True
>>>

operator.is_not

The method return false on method operator is not

>>> "Python Lake" is not "Python Lake"
False

__str__

The method convert the complex to string.

>>> complex(2255888+0j).__str__()
'(2255888+0j)'

type(str.rjust())->str

The returns are :

>>> type("Python".rjust(10))

>>> "Python".rjust(10).__eq__(' Python')

True

>>> len(' Python')

>>> len("Python".rjust(10))

>>>

type(str)

The equal to:

>>> "Python Research Centre".rfind("Centre")
16
>>> type("Python Research Centre".rfind("Centre"))
<class 'int'>
>>> str("Python Research Centre".rfind("Centre"))
'16'
>>> type(str("Python Research Centre".rfind("Centre")))
<class 'str'>

if (map(lambda function, string).__sizeof__.__gt__()

The method returns that a string size is greater than 22.

str="python centre research"
if (map(lambda x: x, str)).__sizeof__().__gt__(22):
print(str.__str__())
else:
print("The string bytes size is greater than 22.")

>>>
python centre research
>>>

class....: def....: str.find()...str.count
The function allow the user to find word in their text.

class method_text_finder():

def __init__(self, a,b):

self.a=str(a)

find1=a.find(b)

print("The word found in your text at position:",find1+1)

count1=a.count(b)

print("The total word found in your text:",count1)

text=input("Please enter your text: ")

find_word=input("Please enter your text:")

method_text_finder(text,find_word)

>>>
Please enter your text: Python Research Centre is located at Woodbridge Va
Please enter your text:Woodbridge
The word found in your text at position: 38
The total word found in your text: 1
>>>

input(webbrowser.open_new())

webbrowser.open_new()

import webbrowser

x=input("Please enter your web address: ")

y=str(x)

if y.startswith("y"):

print("Access denied")

else:

webbrowser.open_new(y)

>>>
Please enter your web address: yellow.com
Access denied

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Python Lake

str

String functions