Develop Reference

"python" in command prompt doesn't work (windows 10)

I downloaded python 1.11 from the python website but whenever I try to launch "python" in command prompt it launches the windows store and tells me to install python.
I ran py -3 and it launches python 3.11 in the command prompt. Is this the only way to access python though why doesn't "python" work?

You need to add python to Windows PATH.
Try using windows search and search for Edit the system environment variables, and then click on Environment variables. You will see "User variables" and "System variables". Find PATH variable in both sections. If you cannot find it, Click "New...".
If you are editing existing PATH, add these 2 lines:
<Your python installation path>\Python311
<Your python installation path>\Python311\Scripts
E.g.:
C:\Users\<User>\AppData\Local\Programs\Python\Python311
C:\Users\<User>\AppData\Local\Programs\Python\Python311\Scripts
If you are creating new PATH variable, add the following line:
<Your python installation path>\Python311;<Your python installation path>\Python311\Scripts
E.g.:
C:\Users\<User>\AppData\Local\Programs\Python\Python311;C:\Users\<User>\AppData\Local\Programs\Python\Python311\Scripts
Save the variables and you can access python using python on terminals.
Note: On some windows, PATH is defined as Path.

PyCharm not able to create conda environment

I'm pretty new to programming, so maybe there's something painfully obvious that I've missed, but I've searched a lot around for solutions to this issue without finding any.
I just got a new computer and installed Anaconda and PyCharm for Anaconda. I got it to work fine on my old computer, but when I try to open PyCharm now and create a project, it gets stuck on the creation of the conda environment. Apparently there's a new conda update, so I tried to update to this one in Spyder, which seemed to work fine, but when PyCharm tries creating a new environment, it gets stuck and only displays
"Creating Conda environment"
"$ conda update -n base -c defaults conda"
Does anybody know what's happening? I've tried just waiting it out, but it doesn't seem to be moving forward at all from that point. I've also uninstalled both Anaconda and PyCharm with all their plugins and reinstalling them, but to no avail.
Thanks for any help or input!
Sincerely, confused first year student

It appears that Sophie was able to get the conda environment up and running.
However, other newcomers might come across a similar problem with regards to setting up Anaconda for use within PyCharm. Therefore, I provide a guide below that I recently (today) used in order to accomplish this on a fresh install on a new computer. For this I decided to use PyCharm Community Edition 2018.3 and Anaconda3 version 2019.07. I performed this on Windows 10 Enterprise version 1903. I have also performed this procedure on Windows 7 Home Premium edition (some time ago).
This will enable you to use PyCharm and Anaconda together, so that you can:
Know the prerequisite steps leading up to creating a conda environment, and become familiar with the steps following this action with using Anaconda with PyCharm.
Use the Terminal window in PyCharm with packages that are installed with Anaconda's version of Python. You can then use both regular python and conda commands to view, update or install packages. For instance, depending on your preference, you could use 'pip list' (python command) or 'conda list' to list installed packages.
Use the Anaconda python interpreter as the default Python Console in PyCharm
To accomplish this, please follow these steps:
Install PyCharm, and import any settings file you may have from previous PyCharm installation on other computer (optional). Assuming you are starting fresh, create a new project and set the (default) project folder location.
Install Anaconda. My install location was set to C:\ProgramData\Anaconda3. Note that 'ProgramData' folder is hidden by default. You should enable viewing of hidden folders in windows explorer, if you need to manually browse for it. Upon installation, I decided to have the options Add Anaconda to my PATH environment variable and Register Anaconda as my default Python 3.7 set as deselected.
Open Windows Explorer and paste in C:\ProgramData\Anaconda3 (or your install directory) in the address bar. This should take you to that directory. Navigate to the environments folder named envs. Select the address bar and copy that address. I got C:\ProgramData\Anaconda3\envs. You will need this later.
Open program named Anaconda Navigator (Anaconda3). You should see this from the list of newly installed programs. Alternatively, search for it and open it. This will initialize some stuff (unknown to me) that I have found necessary to be able to complete this guide. For the next steps we dont need this program running. You could close it if you want.
Decide on a name for the (ana)conda environment that we will create. I used py37 for simplicity. You only need to do this once for the python projects you will make. It is possible to make more environments if you should need that for some python projects in the future.
Open program named Anaconda Prompt (Anaconda3), preferentially as administrator. Opening as administrator may prevent complications that could occur on some systems. To do so, search for the program and then right-click it, and choose Run as administrator.
Enter this command: conda create -n py37 python=3.7 anaconda. It should prompt you to install some packages. Enter y to accept and proceed with the setup. This step may take some time to finish. Once finished, it may show you the needed command to activate the environment. Don't activate it just yet, ie. ignore that message for now.
Assuming environment path C:\ProgramData\Anaconda3\envs and environment name py37, run the following command (alter as needed to match your environment path and name): set PATH=C:\ProgramData\Anaconda\envs\py37\Scripts;C:\ProgramData\Anaconda\envs\py37;%PATH%
Run this command: conda activate py37. This will activate your environment.
Navigate to a folder you can easily access, such as the Documents folder on your machine. To do so, execute this command: cd "C:\Users\YourUsername\Documents".
Execute the following command: echo %PATH% > path_value.txt. This will export "PATH" values to a text file that can be found in the Documents folder as path_value.txt. Open this file and copy the content within. This will be needed in the following steps with setting up PyCharm for use with the Anaconda environment.
In PyCharm, navigate to Settings - Tools - Terminal. Check that Start directory field contains the path of your project folder, ie. such as C:/Users/YourUsername/Documents/YourProjectFolderName. Then, select the folder icon for the Environment variables field. Click the plus symbol, and add a new entry with PATH and your path value (as found from the path_value.txt file) in the Name and Value fields, respectively.
In PyCharm, navigate to Settings - Project Interpreter - Add Python Interpreter - Conda Environment - Existing environment. Browse for C:\ProgramData\Anaconda3 (or your install directory). Select the file named python.exe. I chose to edit the Name field of this Anaconda python interpreter as Python 3.7 Anaconda.
In PyCharm, navigate to Settings - Build, Execution, Deployment - Console - Python Console. Check that the Python interpreter field contains Project Default (Python 3.7 Anaconda) or similar entry. The Environment variables input may be empty. Select the folder button next to it and add a new entry with PATH and your path value (as found from the path_value.txt file) in the Name and Value fields, respectively. Exactly the same entries as was inputted in step 12.
[Optional] In PyCharm, navigate to Settings and search for the Run context configuration option. Right click it and select a desired shortcut method. Personally I use a keyboard shortcut which is set to Ctrl+Shift+Less. Once the rest of these steps are followed, this will allow you to run the current python .py file you have open, without having to manually set up configuration options for it (through Add Configuration option, next to green play button, as seen if you have no configurations set up from before). It will force PyCharm to use the default project interpreter (which now is the desired Anaconda-delivered Python 3.7 installation) for whatever project you have open. To use it, just open a .py python file with some code inside, click anywhere inside of it, and then use your shortcut option.
[Note: If you skipped step 15, go to step 17] Run your python file with the method from step 15. This should automatically set up a run configuration option for that file. You may get an error of missing packages. Ignore that for now.
Select Edit Configuration or Add Configuration in the dropdown box next to the green play / run button. Open the Templates tree, then select Python. Check that the Python interpreter option contains Python 3.7 Anaconda or similar. The Environment variables field may contain PYTHONUNBUFFERED=1. Regardless, select the related folder button and add a new entry with PATH and your path value (as found from the path_value.txt file) in the Name and Value fields, respectively. Exactly the same as we did in steps 12 and 14.
Restart PyCharm to re-initialize the Terminal and Python Console windows. Or manually close and reopen those windows.
You have now created and activated an (ana)conda environment, and enabled it's use from within PyCharm. You should also now be able to ie. copy your code over to a fresh new file, and then hit ie. Ctrl+Shift+Less to run the file without having to manually set a configuration file for it.
Hope this helped!
Sources: source1, source2, source3

In my Experience I just opened PyCharm as administrator and the error was gone!

If you use PyCharm to create conda environment, you can choose conda environment not virtualenv.
When you get the error like "can't get the /path/to/", you can open PyCharm with administrator.
If you use "anaconda prompt" to create conda environment, you can use command line like conda create -n py36 python=3.6. Then you can activate environment using conda activate py36.

pip.exe missing in python scripts module

correction
i edited the environment variable to path Scripts, but in the command prompt on typing the pip command it does not shows up the package installation
python\scripts location picture
While executing the pip command in the command prompt, it shows pip is not recognized as an internal or external command, operable program or batch file.
I tried setting environment variables and all other alternative solution still I am not able to solve it. I recently noticed pip.exe file missing from python/scripts module.
Is that reason to show up this error? if it is yes, how will I install it manually?

You should add the full directory to the Scripts folder to your PATH environment variable. When you run commands in a command prompt, Windows will search through the folders listed in PATH.
Assuming you are on Windows 10:
Press the start button then search "Environment Variables"
Click the "Edit Environment Variables" option.
Click the "Environment Variables" button in the box that pops up.
Scroll down and find the PATH variable, double click it.
Click "New"
Paste in the path to the Scripts folder.
Save it and exit, then restart the terminal. Now pip will be recognized.

Finally I solved it.I used python 3.8.3 version.Not folder named "Scripts" in this version.I just delete this version and reinstall python 3.7.8 version and then pip is here :D

I know this has been solved, but another way of dealing with this is to create an empty file in the 'Scripts' folder and rename it to pip.bat. Then add the following code:
python -m pip %*
Which simply passes all the arguments of the pip command to python.

command line not recognizing python despite it being on my computer

I tried the answer to when this was asked previously and it didn't work, so I'm asking here.
I'm very new to both windows and python, and am trying to run python from my (Windows 10) command line so that I can use pip to install a package (SpaCy). I'm not entirely sure what I'm doing wrong, but after the
C:Users\myname>
typing
C:Users\myname>python
leads to an invalid syntax error, saying:
'python' is not recognized as an internal or external command,
operable program or batch file.
I have python 2.7 installed on my computer, and it works when I use an interpreter such as Rodeo.
I also get the same error when trying to use pip to install SpaCy, although when I try to install pip I get a message that pip is already installed.
Is there some basic knowledge I'm just missing?

When you installed Python, there would have been a tick box that wanted to know if you would like the Python Path adding to the Environment variables. As you didn't select this, your Windows Path doesn't include the folder where the Python executable lives.
To fix this, rerun the installer and modify your install, it should pop up the screen with the tick boxes on, select the one mentioned above and the job should be done.
This is how it works with the Python3 installer, anyhow and I assume that 2.7 will use the same basic model.

You may need to add the newly installed location of python to your path variable.
Control Panel > System > Advanced system settings > Environment variables
Find "Path" and edit.
Append a semicolon ';' and add the full path to your python install location.
To try your new path, you may need to start up another command line cmd.exe to pick up the new PATH.

You need to add python.exe to your Path:
Locate where Python is installed. It's usually located at:
C:\Users\<username>\AppData\Local\Programs\Python\<version>
Now you need to add this directory to your path. To do that press Windows Key, search for 'Environment Variables' and click on 'Edit the System Environment Variables'.
Then 'Environment Variables...'
Click on 'Path' variable and hit 'Edit...'
Then, 'New'...
Put the directory where your Python.exe is installed and hit okay,
Restart your command prompt and try again.

You need to add python installation path to your environment variable.
Click search icon on windows task bar--> type "environment variable" Edit environment variable will pop (System or User)--> add path to python installation till bin to "Path" variable.

Python 3 ModuleNotFoundError: No module named 'numpy'

I trying to run a program in python 3 that uses numpy but it gives me the error ModuleNotFoundError: No module named 'numpy'. I am using Windows 10. I tried running pip install numpy and it says pip is not a recognized command

You need to add python to your environment variables
Computer -> System Properties (or Win+Break) -> Advanced System Settings
Click the Environment variables button (in the Advanced tab)
Edit PATH and append ;C:\Python27 to the end (if you need substitute your Python version)
Click OK. Note that changes to the PATH are only reflected in command prompts opened after the change took place.
If you are running python 3.6 you will need to add python to your environment path through command prompt
Windows allows environment variables to be configured permanently at both the User level and the System level, or temporarily in a command prompt.
To temporarily set environment variables, open Command Prompt and use the set command:
set PATH=C:\Program Files\Python 3.6;%PATH%
set PYTHONPATH=%PYTHONPATH%;C:\My_python_lib
These changes will apply to any further commands executed in that console and will be inherited by any applications started from the console.
To change System variables, you need non-restricted access to your machine (i.e. Administrator rights).
If you were to run python -v it should now work
This came directly from the python documents section 3.3.1
Now after you restart you should be able to access python through the command line. If you are running 2.7.9+ or 3.4+ pip will come prepackaged with python. However, if you are running an earlier version of python
Per https://pip.pypa.io/en/stable/installing/#do-i-need-to-install-pip:
Download get-pip.py, being careful to save it as a .py file rather than .txt. Then, run it from the command prompt:
python get-pip.py
You possibly need an administrator command prompt to do this. Follow Start a Command Prompt as an Administrator (Microsoft TechNet).
Thanks to How do I install pip on Windows?

Add "way to folder with your python interpreter" and "way to folder with your python interpreter"\Scripts\ to PATH variable. Computer -> Properties -> Extra options -> Environment variables.