#🔒 import
delicate field
hey
sullen imp
hey
delicate field
should we start from the previous question first?
sullen imp
yes
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if __name__ == '__main__':
main()
double underscore
sullen imp
oh
sullen imp
if name == 'gay':
main()
delicate field
lets unpack a few things first
i asked if you knew how imports in python work in detail
delicate field
so lets look at that first, because it will be important to explain the double underscore if check above
import mypackage
here you have this import in your own file.py
sullen imp
i wanna be intermediate
delicate field
and you have some other code in mypackage.py
what do you think happends when you write import mypacakge ?
delicate field
when you import a file, all of the code inside that file will run
sullen imp
calculator =
print(eval(input())
delicate field
is that part clear?
delicate field
yes
ok.. you have to calm down
dont you remember what i said when you first asked?
delicate field
i just answered yes br
you keep jumping to other things
sullen imp
i heard eval can run any code
delicate field
i heard eval can run any code
we are not talking about eval
delicate field
you have too calm down and dont jump around
this will not be a quick explaination
sullen imp
just explain, not waste time on this
delicate field
just explain, not waste time on this
im trying but you keep introducing new things all the time..
sudo fr ..... and eval .. and other things while we are talking
you are the one wasting time
so, what was the last thing i talked about, and what did you understand from it?
delicate field
correct.. the key part is all the lines will run
sullen imp
yes
delicate field
keep that in mind, that will be important in a short while
a module, or python file, knoows its own name
so when you do import mypackage you can check its name
import mypackage
print(mypackage.__name__)
yes test it with a module that python has math
delicate field
!e
import math
print(math.__name__)
with name
quiet apexBOT
!e
```py
import math
print(math.__name__)
```
:white_check_mark: Your 3.14 eval job has completed with return code 0.
math
we use it to write code that only executes based on its name
sullen imp
ooh
delicate field
lets say you have some code that should only work if you import the math module
sullen imp
how to do that
delicate field
you can check that you have imported the math module by its name
delicate field
how to do that
ill show you
import math
if math.__name__ == 'math':
print('yay you have imported math')
we can do this, but we often dont do this in this way, we do the inverse
sullen imp
oh
delicate field
instead of checking if we have imported math, we check if we are running math
the oposite of importing a file is to run the file
py file.py
this is how you would run a python file
sullen imp
in vscode
delicate field
you can also run it by clicking your green play button in vscode
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the play button just runs py file.py in the background
python is made to know the difference between a file you have run and a file you have imported
and it know the difference between the two based on the module name
the file you run, will be renamed
sullen imp
import random
if random.name == 'random':
print('yay') ?
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it will be renamed to __main__
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import random
if random.__name__ == 'random':
print('yay') ?
yes
sullen imp
then i can call my code that uses random
delicate field
well, i said you do the inverse of this
sullen imp
and at end do else that will just ignore if not imported
delicate field
you dont really check if an imported name is equal to itself,
you check the oposite, ytou check if the file has been run or if the file has been imported
and i said, the file you run, will be renamed
!e
print(__name__)
:white_check_mark: Your 3.14 eval job has completed with return code 0.
__main__
if you check if file run or imported and it will rename file
delicate field
if you check if file run or imported and it will rename file
the file you run will always be named __main__
you can test it yourself
sullen imp
hmm
delicate field
make a.py and b.py and have print(__name__) in both
sullen imp
if i do this i'll rename file to main?
delicate field
run them each at a time
delicate field
if i do this i'll rename file to main?
not rename file, rename the files __name__
and the name will be __main__
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NAME = 'eivl'
AGE = '43'
def greet(name, age):
print(f'Hello {name}, you are {age} years old')
greet(NAME, AGE)
put this code in greet.py
you need two files for this greet.py and main.py
let me know whhen you have done these two things
sullen imp
you 43?
delicate field
let me know whhen you have done these two things
let me know when you have done these two things
sullen imp
ok
delicate field
your main.py file is empty.. lets add some code to it
your greet.py file has the code above right?
delicate field
delicate field
what in main.py
from greet import greet
greet(name='sorncss', age=16)
age is picked randomly arbitary
😄
i want you to run main.py and see what happends
show me what happends i mean
sullen imp
Unexpected identifier 'main'
SyntaxError
24.10.2025, 09:50:22
so i have to do that as function
delicate field
show what you have done please
sullen imp
pasted code u said
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share a screenshot of what you have done please
sullen imp
delicate field
show me greet.py
i dont know what editor this is though
the files needs to be saved and be in the same locatioon
sullen imp
acode
i just pasted same code
it looks absolutely same
just one space at line 1
because of ```py
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just one space at line 1
must not start with a space
abstract karma
(but a blank line is fine)
delicate field
yes, the issue is you have an space at the start
sullen imp
ok
delicate field
i can run it on my machine and show you if you like to see the example i wrote
notice a thing here @sullen imp
when i run main.py prints out my greet and your greet
delicate field
that is because, when you import something, all lines of the file is run
but we dont want that
we want greet.py to behave one way when i run it, and another way when i import it
when i import the code, i dont want to run the greet() function
withh me on this?
abstract karma
why connected to a git branch
Because eivl is keeping all their code in a git repo. Ignore it - it is not relevant.
delicate field
still same error
you have done something incorrect, lets look at my screen
sullen imp
there no function called greet
sullen imp
you send me code without that bro
delicate field
you send me code without that bro
i did! 😄
delicate field
delicate field
didn't worked
the code i wrote works, want me to show you?
abstract karma
You can copy/paste eivl's greet.py from here: #1431166143883640934 message
delicate field
lemme try code all myself
i dont want you to jump all around
we already talked about this
and you said i could explain, but your not letting me do that
you can run code here on discord
!e
NAME = 'eivl'
AGE = '43'
def greet(name, age):
print(f'Hello {name}, you are {age} years old')
greet(NAME, AGE)
:white_check_mark: Your 3.14 eval job has completed with return code 0.
Hello eivl, you are 43 years old
bruh, ig my IDE just sucks
delicate field
bruh, ig my IDE just sucks
i can show you instead
delicate field
and what happends when you import something?
delicate field
runs all lines
yes
sullen imp
if from filename import functon then just function
if you defined it
and same folder
delicate field
if from filename import functon then just function
just function is imported, but all lines are run no matter what
from greet import greet
greet(name='sorncss', age=16)
how many times are greet function run when you do these?
sullen imp
So that's all about imports?
delicate field
```py
from greet import greet
greet(name='sorncss', age=16)
```
how many times...
it runs two times, do you agree?
delicate field
So that's all about imports?
only one more thing
sullen imp
yes
delicate field
now i will add one more line to fix this issue of it priting two times
sullen imp
because u call function which u called previously and define own age and name
delicate field
it will fix the issue of code running all lines when importing
delicate field
because u call function which u called previously and define own age and name
yes
i want to guard agains that code getting run when i import
but still import it when i run the file
sullen imp
how??
sullen imp
ohhh
delicate field
now i can from greet import greet without that extra greet function beeing run
delicate field
remember what i said earlier, python renames __name__ to __main__ for the python file you run
delicate field
class is a way to write code in a special way called object oriented
it is something you will learn more about in the future
sullen imp
match name:
case "John"
print('lol')
case _:
print('who?')
delicate field
just be carefull of where you learn about it. people have a lot of strange oppininons about how to teach classes to people
delicate field
match name:
case "John"
print('lol')
case _:
print('who?')
match case is not class
do you wonder about match case ?
sullen imp
ik
ik it
i watched about it in cs50
gimme example code soi save somewhere
not sure if my correct
delicate field
pattern matching is something you should practise and learn, it is very useful.. you cant learn it from watching, so you have to do the work yourself
delicate field
i would not worry about pattern matching until you have learned the fundamentals of python
delicate field
i can explain what it is used for if you want, but i will not give out examples. those examples will confuse you. you have to have a solid foundation first
sullen imp
ok
delicate field
have you use lists, tuples and dicts before?
delicate field
do you know what they are?
delicate field
then im not able to explain pattern matching clearly
you should focus on learning the basics and fundamentals of python
the book you where recommended multiple times, it goes over all these
delicate field
then you will not learn programming
sullen imp
ok
delicate field
you have to read and write
watching someone else do the work will not give you the option to learn it
at best, you will only recognise it
and you cant learn programming quickly
delicate field
thats why those 15 hours videos are silly
delicate field
<@172395097705414656>
yes?
delicate field
there is no way for me to explain advanced concepts to you if you have not spend the required time to learn about the fundamentals
you cant learn thiis from watching a video
delicate field
so take the recommendation you have been given and do the work
sullen imp
i need to read a book in big 2025
sullen imp
when i can watch hundreds of guides, and try code myself
so like lists is justvaluee, strings inside a [
delicate field
when i can watch hundreds of guides, and try code myself
depends on how much work you do now, but for an average student studding programming in schoool. 2-3 years
delicate field
you should stay away from youtube to learn programming,
you should do what we have recommended you to do.
but we are not here to force you, only give out advice and help! 😄
sullen imp
i will not read books
sullen imp
no
delicate field
then have a great day and good luck! 😄
quiet apexBOT
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delicate field
!close
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