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What&rsquo;s Up, guys? In this article, I am taking you toward advanced python! If you have no knowledge about python and you want to start coding in python then you can see this video first:
<a href="https://youtu.be/qHJjMvHLJdg" target="_blank" rel="noopener">https://youtu.be/qHJjMvHLJdg</a>
Everything is explained in a simple way. Even if you are new to this line, you would understand it.&nbsp;
Now I am assuming that you know the basics of python. So, let's get started and start writing our first python program. Open Pycharm and create a new file in it
Note: Keep in mind that the file name should not match any module name.
Reason: Basically whatever module we install is stored and recognized as folders/files by the computer. If you want to see these folders/modules then follow this path:
C:\Users\User\AppData\Local\Programs\Python\Python38-32\Lib\site-packages
Tip: AppData is a hidden folder so you may have to change the settings to show hidden files.
When you import a module it is sUpposed to be imported from this place. That&rsquo;s why we don&rsquo;t name any file by module name because then it will just import the local file which you made by the module name.
&lt;|AD|&gt;
<h4>Why do we use if&nbsp;__name__&nbsp;==&nbsp;"__main__"?</h4>
Now if you have made your own module type-of file which consists of a lot of functions. If you import that file and it contains print statements then those lines will also play, now we don&rsquo;t want that. Which is why we use if __name__==&rdquo;__main__&rdquo;. It is not just for print statements, we can put all the lines we don&rsquo;t need in that &lsquo;if&rsquo; block.
Explanation:
Basically what is an if statement? It means if this statement is true then play this code.
So what we are saying is if its value is __main__ then run the code block.
It is like saying:
<pre class="language-python"><code>if __name__ == "__main__":
 print("Not imported!")
</code></pre>
where __name__ is just like a variable whose value is __main__. If we are using the original file and not importing it then &lsquo;if&rsquo; statement is true and the code in that &lsquo;if&rsquo; block runs, otherwise it doesn&rsquo;t. Simple!
Let me show you some easy ways to understand:
<img src="https://cwh-full-next-space.fra1.digitaloceanspaces.com/videos/intermediate-python-1/000e3cb084b8a672dc93c9d548e4d1b3.webp" alt="" width="1026" height="487" />
We can see that it is compiling both lines because nothing is imported and if the statement is true. Whereas,
<img src="https://cwh-full-next-space.fra1.digitaloceanspaces.com/videos/intermediate-python-1/base64_1stA1MM.webp" width="1030" height="489" />
Now it is compiling only print statement and the whole &lsquo;if&rsquo; block is not compiled because it is imported.
But what if there were an else block? Let me show you:
<img src="https://cwh-full-next-space.fra1.digitaloceanspaces.com/videos/intermediate-python-1/base64_TyVf4Vy.webp" width="1034" height="505" />
In the main file else block is not compiled because &lsquo;if&rsquo; statement is true. But what if we import it?
<img src="https://cwh-full-next-space.fra1.digitaloceanspaces.com/videos/intermediate-python-1/base64_VC5KNSf.webp" width="1032" height="505" />
It will then play else block because &lsquo;if&rsquo; is false for this file. Interesting, isn&rsquo;t it?
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<h4>#tut1a.py file as described in the video</h4>
<pre class="language-python"><code>import os
def mostimpfunction():
 print("harry is a coder")

print(__name__)

def main():
 print(os.listdir("/"))
 print("Harry is great and he is the king of US")

if (__name__=="__main__"):
 main()
</code></pre>
<h4>#tut1b.py file as described in the video</h4>
<pre class="language-python"><code>import tut1a
tut1a.mostimpfunction()
tut1a.main()
</code></pre>
&nbsp;