pyenv accepts a switch to the `install` command to list available versions: `--list`, or `-l` for short:

```
$ pyenv install -l
Available versions:
  2.1.3
  2.2.3
  2.3.7
  2.4.0
  2.4.1
  2.4.2
...
```

Before running `pyenv install -l`, you may need to update pyenv as described [here][1].  Otherwise the list may not include the latest versions ([thank you @csatt1](https://stackoverflow.com/a/70228013/17242583)).

[1]: https://stackoverflow.com/questions/43993714/why-is-python-3-6-1-not-available-in-pyenv

After a pip update, pip has stopped working completely.

    Z:\&gt;pip install matplotlib
    Traceback (most recent call last):
      File &quot;c:\program files\python37\lib\runpy.py&quot;, line 193, in _run_module_as_main
        &quot;__main__&quot;, mod_spec)
      File &quot;c:\program files\python37\lib\runpy.py&quot;, line 85, in _run_code
        exec(code, run_globals)
      File &quot;C:\Program Files\Python37\Scripts\pip.exe\__main__.py&quot;, line 9, in &lt;module&gt;
    TypeError: &#39;module&#39; object is not callable

Any help please?

Edit: I am working on windows 10


pip no longer working after update error &#39;module&#39; object is not callable

I try to migrate from Newtonsoft.Json to System.Text.Json.
I want to deserialize abstract class. Newtonsoft.Json has TypeNameHandling for this.
Is there any way to deserialize abstract class via System.Text.Json on .net core 3.0?

Is polymorphic deserialization possible in System.Text.Json?

I want to know what Python versions I could install using the `pyenv install` command.  `pyenv versions` lists only installed versions and does not appear to have an option to list available versions.

**How can I find out what versions of Python I can install with `pyenv install`?**


Finding versions of Python that are available for &quot;pyenv install&quot;

I want to know what Python versions I could install using the <code>pyenv install</code> command. <code>pyenv versions</code> lists only installed versions and does not appear to have an option to list available versions.
How can I find out what versions of Python I can install with <code>pyenv install</code>?

This error occurred during automated testing of a python project on the CI server using `pytest`. I&#39;m using `pytest==4.0.2`. This error only just started to occur, previous pipelines seem to work fine.

The full error:
```
File &quot;/usr/local/lib/python3.7/site-packages/_pytest/tmpdir.py&quot;, line 35, in TempPathFactory
    lambda p: Path(os.path.abspath(six.text_type(p)))
TypeError: attrib() got an unexpected keyword argument &#39;convert&#39;
```

TypeError: attrib() got an unexpected keyword argument &#39;convert&#39;

If we take `b = [1,2,3]` and if we try doing: `b+=(4,)` 

It returns `b = [1,2,3,4]`, but if we try doing `b = b + (4,)` it doesn&#39;t work.

    b = [1,2,3]
    b+=(4,) # Prints out b = [1,2,3,4]
    b = b + (4,) # Gives an error saying you can&#39;t add tuples and lists

I expected `b+=(4,)` to fail as you can&#39;t add a list and a tuple, but it worked. So I tried `b = b + (4,)` expecting to get the same result, but it didn&#39;t work.

Why does b+=(4,) work and b = b + (4,) doesn&#39;t work when b is a list?

I ran my Django project with new macOS Catalina and was running fine.  
I installed oh_my_zsh then I tried to run the same project it is crashing with the following errors. I uninstalled oh_my_zsh and tried again but it did not worked.


```
Path:                  /usr/local/Cellar/python/3.7.4_1/Frameworks/Python.framework/Versions/3.7/Resources/Python.app/Contents/MacOS/Python
Identifier:            Python
Version:               3.7.4 (3.7.4)
Code Type:             X86-64 (Native)
Parent Process:        Python [7526]
Responsible:           Terminal [7510]
User ID:               501

Date/Time:             2019-10-07 20:59:20.675 +0530
OS Version:            Mac OS X 10.15 (19A582a)
Report Version:        12
Anonymous UUID:        CB7F20F6-96C0-4F63-9EC5-AFF3E0989687


Time Awake Since Boot: 3000 seconds

System Integrity Protection: enabled

Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_CRASH (SIGABRT)
Exception Codes:       0x0000000000000000, 0x0000000000000000
Exception Note:        EXC_CORPSE_NOTIFY

Application Specific Information:
/usr/lib/libcrypto.dylib
abort() called
Invalid dylib load. Clients should not load the unversioned libcrypto dylib as it does not have a stable ABI.

```

Python crashing on MacOS 10.15 Beta (19A582a) with &quot;/usr/lib/libcrypto.dylib&quot;

I am building the Dockerfile for python script which will run in minikube windows 10 system below is my Dockerfile



Building the docker using the below command
```docker build -t python-helloworld . ```

and loading that in minikube docker demon
```docker save python-helloworld | (eval $(minikube docker-env) &amp;&amp; docker load)```

Docker File



```
FROM python:3.7-alpine
#add user group and ass user to that group
RUN addgroup -S appgroup &amp;&amp; adduser -S appuser -G appgroup

#creates work dir	
WORKDIR /app

#copy python script to the container folder app
COPY helloworld.py /app/helloworld.py

#user is appuser
USER appuser

ENTRYPOINT  [&quot;python&quot;, &quot;/app/helloworld.py&quot;]
```	


 pythoncronjob.yml file (cron job file)
 
```
apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: python-helloworld
spec:
  schedule: &quot;*/1 * * * *&quot;
  jobTemplate:
    spec:
      backoffLimit: 5
      template:
        spec:
          containers:
          - name: python-helloworld
            image: python-helloworld
            imagePullPolicy: IfNotPresent
            command: [/app/helloworld.py]
          restartPolicy: OnFailure
```

Below is the command to run this Kubernetes job
```kubectl create -f pythoncronjob.yml```


But getting the below  error job is not running scuessfully but when u ran the Dockerfile alone its work fine 

standard_init_linux.go:211: exec user process caused &quot;exec format error&quot;

standard_init_linux.go:211: exec user process caused &quot;exec format error&quot;

I&#39;m wondering how to use an f-string whilst using `r` to get a raw string literal. I currently have it as below but would like the option of allowing any name to replace `Alex` I was thinking adding an f-string and then replacing `Alex` with curly braces and putting username inside but this doesn&#39;t work with the `r`.

    username = input(&#39;Enter name&#39;)
    download_folder = r&#39;C:\Users\Alex\Downloads&#39;

Combine f-string and raw string literal

Versions of Python installed via pyenv fail to import `tkinter`:

```
※ python
Python 3.8.1 (default, Feb 29 2020, 11:45:59)
[Clang 11.0.0 (clang-1100.0.33.17)] on darwin
Type &quot;help&quot;, &quot;copyright&quot;, &quot;credits&quot; or &quot;license&quot; for more information.
&gt;&gt;&gt; import tkinter
Traceback (most recent call last):
  File &quot;&lt;stdin&gt;&quot;, line 1, in &lt;module&gt;
  File &quot;/Users/factor/.pyenv/versions/3.8.1/lib/python3.8/tkinter/__init__.py&quot;, line 36, in &lt;module&gt;
    import _tkinter # If this fails your Python may not be configured for Tk
ModuleNotFoundError: No module named &#39;_tkinter&#39;
&gt;&gt;&gt;
```

or you might get a message about the header version doesn&#39;t match the binary:

```
DEPRECATION WARNING: The system version of Tk is deprecated and may be removed in a future release. Please don&#39;t rely on it. Set TK_SILENCE_DEPRECATION=1 to suppress this warning.
Traceback (most recent call last):
  File &quot;&lt;stdin&gt;&quot;, line 1, in &lt;module&gt;
  File &quot;/Users/factor/.pyenv/versions/3.8.1/lib/python3.8/tkinter/__init__.py&quot;, line 4552, in _test
    root = Tk()
  File &quot;/Users/factor/.pyenv/versions/3.8.1/lib/python3.8/tkinter/__init__.py&quot;, line 2263, in __init__
    self._loadtk()
  File &quot;/Users/factor/.pyenv/versions/3.8.1/lib/python3.8/tkinter/__init__.py&quot;, line 2279, in _loadtk
    raise RuntimeError(&quot;tk.h version (%s) doesn&#39;t match libtk.a version (%s)&quot;
RuntimeError: tk.h version (8.6) doesn&#39;t match libtk.a version (8.5)
```

Content Type	Original Author	Original Content on Stackoverflow
Question	Wayne Conrad	View Question on Stackoverflow
Solution 1 - Python	Wayne Conrad	View Answer on Stackoverflow

Finding versions of Python that are available for "pyenv install"

Python Problem Overview

Python Solutions

Solution 1 - Python

Is polymorphic deserialization possible in System.Text.Json?

pip no longer working after update error 'module' object is not callable

Attributions