Algorithmic trading in Python is revolutionizing the financial markets, offering traders powerful tools for automation and quantitative analysis. In this video, we dive deep into essential concepts like namespaces, scopes, and the LEGB rule, which are crucial for mastering Python in algorithmic trading. Whether you’re a quantitative trader, exploring crypto trading strategies, or looking for the best algorithmic trading software in the USA, this tutorial will enhance your Python skills. Stay tuned as we simplify complex concepts with practical examples.
It is only our darkest hours that we may discover the true strength of the brilliant light within ours that can never ever be dimmed so believe in yourself and stay consistent and try to give your best and rest everything will be okay so let’s start with name spaces and now we click on next so this will be gone if you are able to understand then what happens when I click next so you can see that this local name space will be vanished as soon as the function execution will be completed so when I click on next so now if I print Min what it will think that we are calling this function and inside that we are passing a parameter so it will throw an error welcome back to the day 18 of the 100 days of hell with python algo trading I’m back from the short trip from India and let’s get started with the day 18 and one more thing that I would like to apologize to all of you that.
We had to break this series because of some unforeseen events back in India and I had to go back but now all okay and let’s start so we are left with only two topics of the core python that is name spaces and decorators so we’ll try to cover these two topics in this session itself and if not then one more session will be there and we’ll be finish with the core Python and then we’ll start with the python libraries and also I’ll update the whole curriculum on the website shortly hopefully by this weekend so you can go through and let me know if anything else is required so with that being said uh
Let’s start so before we get started I would like to show you some words of wisdom so it is only our darkest that we may discover the true strength of the brilliant light within yourself that can never ever be dimmed so believe in yourself and stay consistent and try to give your best and rest everything will be okay so let’s start with Nam spaces a name space is a space that holds names that is identifiers like the name of functions the name of class and the name of variables those are the identifiers so we can say programmatically speaking Nam space are dictionary of identifiers that is key and their objects so let’s say like we have a variable name variable equals to A so here in the name space it will become a dictionary okay let’s make it two so in the name space.
It will become a dictionary so we can write like variable as the key and two as the value of this and let’s say again we have a function so function starts like this right so here again this function is the key right the function name is the key and whatever it returns and whatever it Sprints it becomes the value of that right so the function return we can say the value of so in name spaces we can say that all these identifiers the name of variable the name of function or the name of class becomes the keys and the value of those keys becomes the value obviously right so we can say like that correct so there are four type of name spaces the first is built-in second is global third is enclosing and fourth is local don’t worry we’ll learn all these one by one first Theory and then we’ll proceed with the coding examples so now let’s see the scope and lb rule so a scope is a textual reason of a Python program where a namespace is directly accessible so we can say that whenever we execute a program.
We have a scope and a name space so in order to understand that I’ll show you one screenshot from the python tutor and let’s see this is a program so when we try to visualize with the help of python tutor there is two Scopes created right so what happens when we start the execution what happens the program goes to the first line right here and it sees that there is a variable name threshold price is equals to 100 so it will create a global frame which is this one right and inside that we have a variable named threshold price is equals to 100 and it will be inside the global frame so we can say the scope of this variable is global right and again here the dictionary is created so the threshold price is the key and 100 is the value of the dictionary again the program next move to the here and here it sees a function so so as we have already studied that the function name is also a key so it will mention this here the key right the value is not here as of now then it will skip the whole program correct and it will move here so here.
It will see that there is a variable named current market price is equals to 102 so it will declare that in the global frame so we can say Global frame is the global scope and there are three name spaces two variables the first is special price second is current market price and the third key is the name of the function hope you are able able to understand my explanation if you have any doubt let me know in the comments I’ll try my best and maybe we can discuss it again in any supplementary session correct so now when the program reaches this line number 13 there is a function called check price and trade and here it will create another frame and that will be known as the local scope or the local frame right so now.
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Day 18: Namespaces
