#🔒 Exercise help
neat rose
neat rose
what is this exercising asking me to do?
Im just confused with
why is there name: alice?
hallow escarp
Have you worked with dict yet?
charred wraith
why is there name: alice?
Hint semi-spoiler:
||Because you need to print it with print()||
hallow escarp
Hint semi-spoiler:
||Because you need to print it with print()||
That's not what it's asking them to do
It seems they're unfamiliar with dicts which is the issue
charred wraith
That's not what it's asking them to do
It’s asking them to change the values in dict and print smthg no ?
charred wraith
It seems they're unfamiliar with dicts which is the issue
Yh i see that
hallow escarp
It’s asking them to change the values in dict and print smthg no ?
It just says access, it doesn't say print
hallow escarp
yup
charred wraith
Yh then you just do this :
||
print(student[name])
```||almost, the key here would be a string
charred wraith
Or
print("Name:", student["name"])
That's still not using a correct string as the key
charred wraith
That's still not using a correct string as the key
Oh bruh i didnnt catch it lol
Better
hallow escarp
yes 🙂
neat rose
Have you worked with dict yet?
actually I found the solution and understand it but i have a new problem
could you explain me the practical note point?
hallow escarp
actually I found the solution and understand it but i have a new problem
Do you understand what nesting means? What about .get()?
hallow escarp
!e
student = {'name': 'Alice'}
print(student['name'])
meager meadowBOT
!e
```py
student = {'name': 'Alice'}
print(student['name'])
```
:white_check_mark: Your 3.14 eval job has completed with return code 0.
Alice
we can access a key like so, but, if the key does not exist, it will error
!e
student = {'person': 'Alice'}
print(student['name'])
:x: Your 3.14 eval job has completed with return code 1.
001 | Traceback (most recent call last):
002 | File [35m"/home/main.py"[0m, line [35m2[0m, in [35m<module>[0m
003 | print([31mstudent[0m[1;31m['name'][0m)
004 | [31m~~~~~~~[0m[1;31m^^^^^^^^[0m
005 | [1;35mKeyError[0m: [35m'name'[0m
I understand that it doesnt crash while using .get() because it would just return None, but what purpose does that achieve
hallow escarp
it's easier to pair it with a condition (even though you could do the same without it)
if student.get('name')
you could also do if 'name' in student'
neat rose
it's easier to pair it with a condition (even though you could do the same witho...
wdym pair it with a condition?
hallow escarp
but another advantage of get() is we can choose an alternative value in case of failure
!e
student = {'person': 'Alice'}
print(student.get('name', 'UNKNOWN'))
:white_check_mark: Your 3.14 eval job has completed with return code 0.
UNKNOWN
this returns the value if the key exists, but if it doesn't, we return an alternate value
neat rose
but our whole goal is to get a value from the nested dict right?
why do we want an alternative value
hallow escarp
student.get('info', {})
because we could do something like this
if we're expected a dict value but the key doesn't exist, at least we still get a dict response
neat rose
`student.get('info', {})`
why info?
hallow escarp
the type doesn't change in success/failure
neat rose
where didd u get info from
hallow escarp
why info?
the name doesn't matter, I just picked a random key name that could potentially have a dict as its value
neat rose
if we're expected a dict value but the key doesn't exist, at least we still get ...
I see
hallow escarp
so if I expect the info key to have a dict as its value
I'm basically saying "Give me the dict if it exists, or give me an empty dict if it doesn't"
neat rose
why get an error in the first place?
hallow escarp
keeping the type consistent will help avoid future errors
neat rose
if the value is right there in the nested ddict, what can possibly go wrong?
hallow escarp
nothing will go wrong if it is there
but look at this example
student = {'person': 'Alice'}
info = student.get('info')
grades = info.get('grades')
'info' doesn't exist
so it will return None
None.get('grades') will error
student = {'person': 'Alice'}
info = student.get('info', {})
grades = info.get('grades', {})
why are u doing this code?
hallow escarp
why are u doing this code?
because get() will return None if the key doesn't exist
!e
student = {'person': 'Alice'}
info = student.get('info')
print(info.get('grades'))
:x: Your 3.14 eval job has completed with return code 1.
001 | Traceback (most recent call last):
002 | File [35m"/home/main.py"[0m, line [35m3[0m, in [35m<module>[0m
003 | print([1;31minfo.get[0m('grades'))
004 | [1;31m^^^^^^^^[0m
005 | [1;35mAttributeError[0m: [35m'NoneType' object has no attribute 'get'[0m
'NoneType' object has no attribute 'get'
neat rose
ok so its still ok to use the standard way?
hallow escarp
we use .get() when there's the possibility that the key might not exist
otherwise, use getitem syntax
dict[key]
meager meadowBOT
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