I commonly use dictionary unpacking for database and API connections that take a number of keyword arguments. Simply store the configuration in a dict and pass it to the function: db_config = { 'user': 'Joe', 'password': 'secret', 'host': 'localhost', 'db': 'production' } connection = connect(**db_config)
The * operator can be used to unpack an iterable into separate variables. The ** can be used to unpack a dictionary. But in the case of *args and **kwargs used as function parameters, they are packing and not unpacking. *args takes several positional arguments and packs them into a tuple. **kwargs takes several named parameters and packs them into a dictionary.
Hi there, regarding 8:05 comment I have just discovered: If you want to use dictionary values but keys don't match our function arguments you can just write print_vector(*(dict_vec).values())
Hi, can you please let me know your python development environment. I can see that this video is made on Mac. But i'm not sure what python console are you using. I'm surprised to see that its autocomplete, auto suggestions, and intellisense all enabled. is it plain python3 (command) or is it pycharm ide's python3 console or jupyter notebook online or jupyter notebook offline? Can you please let us know this Thanks and Regards Ajay Kumar Kasam
Can someone explain to me, how to check whether a given time in "hh:mm" format falls in between a given range. Say, given time is 10:30 A.M IST and my range is between 10:00 A.M and 11:00 A.M. So given time falls in the range. Is there any package in python to do this in the easiest way? Would be happy if anyone can help with this :)
and I just wrote my own reader to check the star :-) def text_reader(*text): print(*text, sep='') with open('./test.txt') as f: reader = f.read() text_reader(*reader)
Because LIST and TUPLE are containers where the elements are ordered; the position of the elements has meaning (the positions are meta data); and you can access the elements by position (index). SET and DICTIONARY are containers where the elements are not ordered; the position of the elements has no meaning, and you cannot access the elements by position.
3:06 Realy Python: Dan Bader: "... because function argument unpacking can do something really similar to what we'd been doing here manually where we're unpacking this tuple manually. There is actually a shorthand to do that in Python."
3:25 Dan Bader: "So what we can do here is we can call the print_vector function again. I can use the * operator, the unpacking operator, and just pass my tuple vector to that print_vector function."
2:58 Dan Bader: "If I want to print this vector, it gets kind of awkward. I am sure I could write a different function that would take a tuple vector directly, but what if my vector is going to be represented as a dictionary, or something else, it gets really awkward ...
![[DRIP] ‘CLIK CLAK’ PREVIEW](http://i.ytimg.com/vi/bcxkcOSbpac/mqdefault.jpg)
I was struggling on a solution with an issue with my program for days and than i saw this video and yiu solved my problem, thank you!!!!
I commonly use dictionary unpacking for database and API connections that take a number of keyword arguments. Simply store the configuration in a dict and pass it to the function:
db_config = {
'user': 'Joe',
'password': 'secret',
'host': 'localhost',
'db': 'production'
}
connection = connect(**db_config)
You can directly pass the dict and still performs the same fn right?
simple and powerful I like it
Thanks bro, you saved my project.
This is incredible. This was exactly what I needed. Thanks a lot!
The * operator can be used to unpack an iterable into separate variables. The ** can be used to unpack a dictionary. But in the case of *args and **kwargs used as function parameters, they are packing and not unpacking. *args takes several positional arguments and packs them into a tuple. **kwargs takes several named parameters and packs them into a dictionary.
Good tutorial. Thanks for sharing.
unpacking on named arguments is awesome
A cool thing to note is a * on a dict will return the keys.
Haha never mind :)
It doesn't
d = {
"K1" : "v1",
"K2" : "v2"
}
def myfun(*d):
print(d)
myfun(d)
And it prints the key value pairs not only keys
Hi there, regarding 8:05 comment I have just discovered:
If you want to use dictionary values but keys don't match our function arguments you can just write
print_vector(*(dict_vec).values())
Very, VERY good! Thank you.
I Purchased book on Kindle...enjoying it!!
That's great! Glad to hear it.
Best explanation on the internet hands down
Hi, can you please let me know your python development environment. I can see that this video is made on Mac. But i'm not sure what python console are you using. I'm surprised to see that its autocomplete, auto suggestions, and intellisense all enabled. is it plain python3 (command) or is it pycharm ide's python3 console or jupyter notebook online or jupyter notebook offline?
Can you please let us know this
Thanks and Regards
Ajay Kumar Kasam
thank you bro, now i understund how can i work with argument unpacking for list, tuples, dictionnary thank's again
You're welcome!
Thanks for the explanation!
You're welcome!
PLEASE ANSWER:
does this means that the value returned represent a vector?, like when it is like this [1,0,1] it means that it is a list.
This was added as part of the definition in the print_vec() function. Nothing to do with whether it represents a vector.
how do you make your terminal show suggestions for python?
He's using Sublime Text with several plug-ins -- he has a separate book/course about how to set up ST specifically for Python development.
how do you solve the problem if you don't know the names of the dictionary keys?
Sir, I want to use object name in class before making the object that means inside the class?????????
We can define function as print_vector(list1=[]) and same way for tuple
How is the difference
Great video, Thanks Dan!
Can someone explain to me, how to check whether a given time in "hh:mm" format falls in between a given range.
Say, given time is 10:30 A.M IST and my range is between 10:00 A.M and 11:00 A.M. So given time falls in the range.
Is there any package in python to do this in the easiest way?
Would be happy if anyone can help with this :)
and I just wrote my own reader to check the star :-)
def text_reader(*text):
print(*text, sep='')
with open('./test.txt') as f:
reader = f.read()
text_reader(*reader)
thanks bro
You're welcome!
what are you using to code, console?
thanks a lot Daniel!... :-)
can you explain *_ please?
Thanks for the suggestion!
Python Training by Dan Bader Can you explain me how did you made this program in another video or any other way
Why exactly did the keys occur in random order?
Because LIST and TUPLE are containers where the elements are ordered;
the position of the elements has meaning (the positions are meta data);
and you can access the elements by position (index).
SET and DICTIONARY are containers where the elements are not ordered;
the position of the elements has no meaning, and you cannot access the elements by position.
Thank you so much! This was great
You're welcome! I'm happy that you liked it!
3:06 Realy Python:
Dan Bader:
"... because function argument unpacking can do something really similar to what we'd been doing here manually where we're unpacking this tuple manually.
There is actually a shorthand to do that in Python."
3:03 Real Python:
Dan Bader:
"... and this is where the function argument unpacking could become really helpful."
3:25
Dan Bader:
"So what we can do here is we can call the print_vector function again. I can use the * operator, the unpacking operator, and just pass my tuple vector to that print_vector function."
to me for this(**) it is giving error
2:58
Dan Bader:
"If I want to print this vector, it gets kind of awkward. I am sure I could write a different function that would take a tuple vector directly, but what if my vector is going to be represented as a dictionary, or something else, it gets really awkward ...
... just realized that I've been doing things like my_func(*some_dict.values()) and how someday that's going to bite me in the ass ... whoops...
who here doesn't love to lay pipe...
I buy python programming introduction to computer science by john zelle
Thanks for sharing!
Are you Doctor Strange?
If you're listening to this, and you don't cringe, then you're not a C programmer.