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Python files not executed by command prompt

So I dont know what happened but my python files are not being executed by the command prompt.
C:/Users/MOHAMMED/Local/Programs/Python/Python39>button.py
Above is what im trying to do. but it keeps giving me errors.
This file does not have an app associated with it for performing this action.
I have been using cmd prompt everyday to execute python files but today it is not working. any help is appreciated.
(I use IDLE to do my code btw)
edit:
So this is what i do when im trying to execute files using cmd prompt.
I go into the directory of where all the python files are stored by using cd command.
2)then i just say the name of the file and it works.
but today i installed pip by using setup program and after pip was installed, i cant execute python file using cmd prompt.

You are trying to execute the wrong way it should be:
python button.py
If that doesn't work then :
The complete path of python.exe can be added by:
Right-clicking This PC and going to Properties.
Clicking on the Advanced system settings in the menu on the left.
Clicking on the Environment Variables button o​n the bottom right.
In the System variables section, selecting the Path variable and clicking on Edit. The next screen will show all the directories that are currently a part of the PATH variable.
Clicking on New and entering Python’s install directory.
Then again try :
python button.py

Running Python on Ubuntu Shell

I am trying to run python on Ubuntu. ADDED: It's a double boot system with Windows.
If I type python on the shell, it opens python. But I want to run a python file.
I have my python (.py) file saved on windows Desktop.
On Windows when I run a .py file in my command prompt, I just have to change directory to Desktop then type python myfile.py and the code runs successfully.
When I try to do that same thing in Ubuntu, it does not work. I made a Desktop directory in Ubuntu using the mkdir function.
Now, when I type python myfile.py, I get the error:
python: can't open file 'myfile.py': [Errno 2] No such file or
directory
I tried typing python on the Ubuntu shell then dragging the myfile.py file (~$ python C:\Users\username\Desktop\myfile.py), it used to run and then close the answer right away, but now I would get the error
python: can't open file 'C:UsersusernameDesktopmyfile.py': [Errno 2]
No such file or directory
Can anyone tell me what are the exact steps I need to do to fix this?
EDIT:
Here is what I am writing from the answers below:
~$ python /home/username/Desktop/myfile.py
Yet, I am getting this error:
python: can't open file '/home/username/Desktop/myfile.py': [Errno 2] No such file or directory
EDIT 2**
So here is something new:
if I write
python /home/username/Desktop myfile.py
I get this error
/usr/bin/python: can't find 'main' module in '/home/username/Desktop
If I write
python /home/username/myfile.py
I do not get an error, but I do not get any output either. Ubuntu just goes to the next line $

Strange on Ubuntu your path starts with c:\...
On Ubuntu user folders are usually in /home, user folder can be referenced by ~, so IMHO python ~/Desktop/myfile.py should work in your environment.
EDIT: noted you made Desktop folder, not original Desktop, that way when you are in that folder type pwd it will show full path, then put it in python PATH/myfile.py (and just in case you may type ls to show list of files in current folder on Linux to check you are indeed in the right folder where your program is).
ADDED: after discussion it turned to be double boot system, mount showed mounted windows disk and file.py was found and run!

Backslash '\' is an escape character, in Unix it will not be used if you put it in a path. It results in your error of path not found.
Use slash '/', your code should run.
It is weird that you have a path for windows, in Unix you should not have this type of path...
Open a terminal, go to the folder with your python script. Use pwd in the terminal to know the exact location and then copy the path and use the following (I take an example here):
python PATHTOYOURPYTHONSCRIPT/mypythonscript.py

You're trying to use windows path representation in Linux. Windows and Linux has different path representations.
In windows, you can use C:\ but in Linux it's just a / which is used to denote the root directory.
In the terminal, type 'pwd' where your python file is present in Ubuntu and you'll see the output as '/home/username/Desktop' which is not like windows.
So you need to run like, 'python /home/username/Desktop/my file.py'.
If you need to access the file present in the windows partition, you need to mount the windows partition. This can be done using the Files app present in Ubuntu. After that, you can navigate to /mnt/media/ and find your file.

How do you run python files with ! in filepath using vscode's integrated terminal?

I am running a python file in visual studio code 1.3.5.1 using an anaconda environment from a folder directory that contains !.
open file.py
right click
click "Run Python File in Terminal"
The (dummy) filepath looks
/Volumes/Cake Pies/!Name/Bruce/!Jump/file.py
I expect the python file to run in the integrated terminal, but instead get an error message in terminal. The exact error (with dummy data names):
(base) computer:pptx_auto Bruce$ source /Users/Bruce/anaconda3/bin/activate
(base) computer:pptx_auto Bruce$ conda activate pptx
(pptx) computer:pptx_auto Bruce$ /Users/Bruce/anaconda3/envs/pptx/bin/python "/Volumes/Cake Pies/!Name/Bruce/!Jump/file.py"
bash: !Name/Bruce: event not found
I understand that ! is a convention used in Unix shells, but don't know how to circumvent this problem.

Python File Directory Can't be found

When I try to run my python file, I get the following error: "can't open file 'hello.py': [Errno 2] No such file or directory" I have tried cd and it shows that my file is in the Users/ierdna/ directory. I have the python program on my desktop and I still cannot run it.
Thanks very much!
It seems that I have tried everything, and nothing is working. :(

I am going to assume you know some of the basic BASH command line commands. If you don't check them out here.
Opening your terminal's respective shell, enter the following on your command line:
cd Desktop [to change directory to your desktop]
ls [to list all the directories and files on your desktop, to make sure your hello.py file is in fact there]
python hello.py [to run your python file]
That should run it. Let me know if you run into errors.

In order to properly answer this question the following information are required:
a. OS that you are using
b. Release version of that OS
c. Python version that you are using
d. If your machine has at least 10GB of free space
Kidding!
You just need to use cd ~/Desktop to make the 'Desktop' your working directory and then try to run python hello.py Alternatively you can also try running python ~/Desktop/hello.py directly without using 'cd' command. Note: In order to run a python script you need to provide the path(Either complete path, for example: python /home/username/Desktop/script.py or relative path, for example: python ../script.py) to the script. If you just provide the script name, it will fail unless the script exists in the current working directory. Also, kindly do check for existing questions and answers before posting your own question as I doubt this question is new and hasn't been answered correctly before.

I'm going to assume from you saying you used cd that you are using Mac or Linux. This solution will work for both. If I am wrong and you are running Windows, just comment it and I'll change the answer. On to the real answer:
First open your terminal, then type cd ~/Desktop. Now try running your python script.
EDIT:
Apparently you are running Windows. OK. I'm going to leave the above answer for other people who have the same problem on Mac or Linux. What you need to do is execute this command in your command prompt cd C:\Users\[your user name]\Desktop. Replace [your user name] with your actual user name. Then run your python script (python hello.py)

How to run python script on terminal (ubuntu)?

I'm new with python, I've been learning for a few weeks. However now I've just changed my OS and I'm now using ubuntu and I can't run any script on my terminal.
I made sure to have the #!/usr/bin/env python
but when I go to the terminal and type, for example python test.py
the terminal shows an error message like this
python: can't open file 'test.py': [Errno 2] No such file or directory
what do I do?
I must save the file in any specific folder to make it run on terminal?

This error:
python: can't open file 'test.py': [Errno 2] No such file or directory
Means that the file "test.py" doesn't exist. (Or, it does, but it isn't in the current working directory.)
I must save the file in any specific folder to make it run on terminal?
No, it can be where ever you want. However, if you just say, "test.py", you'll need to be in the directory containing test.py.
Your terminal (actually, the shell in the terminal) has a concept of "Current working directory", which is what directory (folder) it is currently "in".
Thus, if you type something like:
python test.py
test.py needs to be in the current working directory. In Linux, you can change the current working directory with cd. You might want a tutorial if you're new. (Note that the first hit on that search for me is this YouTube video. The author in the video is using a Mac, but both Mac and Linux use bash for a shell, so it should apply to you.)

Set the PATH as below:
In the csh shell − type setenv PATH "$PATH:/usr/local/bin/python" and press Enter.
In the bash shell (Linux) − type export PATH="$PATH:/usr/local/bin/python" and press Enter.
In the sh or ksh shell − type PATH="$PATH:/usr/local/bin/python" and press Enter.
Note − /usr/local/bin/python is the path of the Python directory
now run as below:
-bash-4.2$ python test.py
Hello, Python!

Save your python file in a spot where you will be able to find it again. Then navigate to that spot using the command line (cd /home/[profile]/spot/you/saved/file) or go to that location with the file browser. If you use the latter, right click and select "Open In Terminal." When the terminal opens, type "sudo chmod +x Yourfilename." After entering your password, type "python ./Yourfilename" which will open your python file in the command line. Hope this helps!
Running Linux Mint

Sorry, Im a newbie myself and I had this issue:
./hello.py: line 1: syntax error near unexpected token "Hello World"'
./hello.py: line 1:print("Hello World")'
I added the file header for the python 'deal' as #!/usr/bin/python
Then simple executed the program with './hello.py'

First create the file you want, with any editor like vi or gedit. And save with a .py extension. In that the first line should be
#!/usr/bin/env python