Python, how does dict and classes work

[Joveice]

Hello,

 

So I'm used to work with Laravel's Collection and Normal OOP PHP.

 

So currerntly I do 

 

data = Data.All()

for item in data['item']
	item['name']

but how should this be, is there some other way like PHP's way where you do etc data->items() and $item->name?

I also would like to change one of the values before it's returned, so I can do a if on a value, if it's this then change it with that and so on.

 

Does Pythons class stuff work the same or is it completely different?

 

EDIT:

 

The Data.All() returns a dict.

[Guest]

Are you trying to import a function from a library?

You can try this

# importing everything
from math import *

# import a specific function
from math import sqrt

# importing multiple functions
from math import sqrt, pi, sin

When importing something, don't add parenthesis, for example write sqrt not sqrt()

 

 

Hope that helped

[Joveice]

Just now, lewdicrous said:

Are you trying to import a function from a library?

You can try this

# importing everything
from math import *

# import a specific function
from math import sqrt

# importing multiple functions
from math import sqrt, pi, sin

When importing something, don't add parenthesis, for example write sqrt not sqrt()

 

 

Hope that helped

Nope you missed the whole thread.

[Guest]

7 minutes ago, Joveice said:

Nope you missed the whole thread.

Damn.. sorry 'bout that.

Maybe this will help if you're using python 3, https://docs.python.org/3/tutorial/classes.html

[Dujith]

Do you mean a dictionary with dict?

[Joveice]

I tried, this is the part I want.

 

class Dog:

    kind = 'canine'         # class variable shared by all instances

    def __init__(self, name):
        self.name = name    # instance variable unique to each instance

>>> d = Dog('Fido')
>>> e = Dog('Buddy')
>>> d.kind                  # shared by all dogs
'canine'
>>> e.kind                  # shared by all dogs
'canine'
>>> d.name                  # unique to d
'Fido'
>>> e.name                  # unique to e
'Buddy'

But I can't set the self outside the __init__.

 

etc full code:

 

data = Data.Request()
items = data.all()
for item in items:
  item['name']

in this I would like to do etc item.name

and I would like to have the value returned in item.status to be changed before it's returned.

 

4 minutes ago, Dujith said:

Do you mean a dictionary with dict?

Correct.

[tikker]

On 19/03/2018 at 12:41 PM, Joveice said:

I tried, this is the part I want.

 

<snip>

 

But I can't set the self outside the __init__.

 

etc full code:

 

data = Data.Request()
items = data.all()
for item in items:
  item['name']

in this I would like to do etc item.name

and I would like to have the value returned in item.status to be changed before it's returned.

 

Correct.

Not quite sure what you are trying to achieve. Do you want dictionaries or classes? How is item.status related to item.name?

 

Class

Anyway, the "self" parameter refers to the object itself, which is accessible inside the class and is passed to each method call, as the first argument, implicitely. You cannot "set" self to anything, since it refers to the object (e.g. d or e in your example). You can change or add an attribute by just doing

d.name = 'New name'	# Change existing attribute.
d.breed = 'New dog'	# Add new attribute.

Dictionaries

Dictionaries are just stored as

example_dict = {'key1':value1, 'key2':value2, 'key3':value3}

and can be accessed/modified/extended with

example_dict['key1']	# Get the value.
example_dict['key1'] = <new value>	# Modify the value of key1.
example_dict['key4'] = <value>	# Add a new element.

To loop over all the items you can do something like

for key, value in example_dict.items():# or items() is Python3, replace with iteritems in Python 2
  if key == 'something':
    new_value = value * 5
    example_dict[key] = new_value