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Q&A Automatically install all packages needed

When running various Python scripts, I often need to do this annoying dance: $ python script.py ... ModuleNotFoundError: No module named 'foo' $ pip install foo $ python script.py ... Module...

3 answers · posted 1y ago by matthewsnyder‭ · last activity 1y ago by meta user‭

Question python-3 pip

#4: Post edited by

matthewsnyder‭ · 2023-06-16T22:39:10Z (over 1 year ago)

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When running various Python scripts, I often need to do this annoying dance:
```shell
$ python script.py
...
ModuleNotFoundError: No module named 'foo'
$ pip install foo
$ python script.py
...
ModuleNotFoundError: No module named 'bar'
$ pip install bar
$ python script.py
...
ModuleNotFoundError: No module named 'baz'
$ pip install baz
$ python script.py
(correct output from script)
```
Yes, I know this can be solved by creating a `requirements.txt` file, packaging the script, etc. But I'm asking about cases where that ship has sailed. All I have is a script that optimistically imports stuff.
Python already knows what package it's *supposed* to be, since it's named in the `ModuleNotFoundError`. Is there a way to tell Python to react by attempting a `pip install` on that, rather than raising an exception?
------
I am aware that:
* `ModuleNotFoundError` may raise not just for missing packages, but also modules (eg. `foo.py`) in the same directory. I'm happy with a solution that blindly assumes it's always a PyPi packages.
* [Some](https://pypi.org/project/xdg-base-dirs/) packages use a different name for `pip install` and `import`. I'm happy with a solution that fails or installs the wrong package in this case.
* It is dangerous to blindly install packages from PyPi. I'm okay with the risks.

When running various Python scripts, I often need to do this annoying dance:
```shell
$ python script.py
...
ModuleNotFoundError: No module named 'foo'
$ pip install foo
$ python script.py
...
ModuleNotFoundError: No module named 'bar'
$ pip install bar
$ python script.py
...
ModuleNotFoundError: No module named 'baz'
$ pip install baz
$ python script.py
(correct output from script)
```
Yes, I know this can be solved by creating a `requirements.txt` file, packaging the script, etc. But I'm asking about cases where that ship has sailed. All I have is a script that optimistically imports stuff.
Python already knows what package it's *supposed* to be, since it's named in the `ModuleNotFoundError`. Is there a way to tell Python to react by attempting a `pip install` on that, rather than raising an exception?
------
I am aware that:
* `ModuleNotFoundError` may raise not just for missing packages, but also modules (eg. `foo.py`) in the same directory. I'm happy with a solution that blindly assumes it's always PyPi packages.
* [Some](https://pypi.org/project/xdg-base-dirs/) packages use a different name for `pip install` and `import`. I'm happy with a solution that fails or installs the wrong package in this case.
* It is dangerous to blindly install packages from PyPi. I'm okay with the risks.

#3: Post edited by

matthewsnyder‭ · 2023-06-16T22:38:41Z (over 1 year ago)

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When running various Python scripts, I often need to do this annoying dance:
```shell
$ python script.py
...
ModuleNotFoundError: No module named 'foo'
$ pip install foo
$ python script.py
...
ModuleNotFoundError: No module named 'bar'
$ pip install bar
$ python script.py
...
ModuleNotFoundError: No module named 'baz'
$ pip install baz
$ python script.py
(correct output from script)
```
Yes, I know this can be solved by creating a `requirements.txt` file, packaging the script, etc. But I'm asking about cases where that ship has sailed. All I have is a script that optimistically imports stuff.
Python already knows what package it's *supposed* to be, since it's named in the `ModuleNotFoundError`. Is there a way to tell it to react by attempting a `pip install` on that, rather than raising an exception?
------
I am aware that:
* `ModuleNotFoundError` may raise not just for missing packages, but also modules (eg. `foo.py`) in the same directory. I'm happy with a solution that blindly assumes it's always a PyPi packages.
* [Some](https://pypi.org/project/xdg-base-dirs/) packages use a different name for `pip install` and `import`. I'm happy with a solution that fails or installs the wrong package in this case.
* It is dangerous to blindly install packages from PyPi. I'm okay with the risks.

When running various Python scripts, I often need to do this annoying dance:
```shell
$ python script.py
...
ModuleNotFoundError: No module named 'foo'
$ pip install foo
$ python script.py
...
ModuleNotFoundError: No module named 'bar'
$ pip install bar
$ python script.py
...
ModuleNotFoundError: No module named 'baz'
$ pip install baz
$ python script.py
(correct output from script)
```
Yes, I know this can be solved by creating a `requirements.txt` file, packaging the script, etc. But I'm asking about cases where that ship has sailed. All I have is a script that optimistically imports stuff.
Python already knows what package it's *supposed* to be, since it's named in the `ModuleNotFoundError`. Is there a way to tell Python to react by attempting a `pip install` on that, rather than raising an exception?
------
I am aware that:
* `ModuleNotFoundError` may raise not just for missing packages, but also modules (eg. `foo.py`) in the same directory. I'm happy with a solution that blindly assumes it's always a PyPi packages.
* [Some](https://pypi.org/project/xdg-base-dirs/) packages use a different name for `pip install` and `import`. I'm happy with a solution that fails or installs the wrong package in this case.
* It is dangerous to blindly install packages from PyPi. I'm okay with the risks.

#2: Post edited by

matthewsnyder‭ · 2023-06-16T22:38:11Z (over 1 year ago)

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When running various Python scripts, I often need to do this annoying dance:
```shell
$ python script.py
...
ModuleNotFoundError: No module named 'foo'
$ pip install foo
$ python script.py
...
ModuleNotFoundError: No module named 'bar'
$ pip install bar
$ python script.py
...
ModuleNotFoundError: No module named 'baz'
~~$ pip install bar~~
$ python script.py
(correct output from script)
```
Yes, I know this can be solved by creating a `requirements.txt` file, packaging the script, etc. But I'm asking about cases where that ship has sailed. All I have is a script that optimistically imports stuff.
Python already knows what package it's *supposed* to be, since it's named in the `ModuleNotFoundError`. Is there a way to tell it to react by attempting a `pip install` on that, rather than raising an exception?
------
I am aware that:
* `ModuleNotFoundError` may raise not just for missing packages, but also modules (eg. `foo.py`) in the same directory. I'm happy with a solution that blindly assumes it's always a PyPi packages.
* [Some](https://pypi.org/project/xdg-base-dirs/) packages use a different name for `pip install` and `import`. I'm happy with a solution that fails or installs the wrong package in this case.
* It is dangerous to blindly install packages from PyPi. I'm okay with the risks.

When running various Python scripts, I often need to do this annoying dance:
```shell
$ python script.py
...
ModuleNotFoundError: No module named 'foo'
$ pip install foo
$ python script.py
...
ModuleNotFoundError: No module named 'bar'
$ pip install bar
$ python script.py
...
ModuleNotFoundError: No module named 'baz'
$ pip install baz
$ python script.py
(correct output from script)
```
Yes, I know this can be solved by creating a `requirements.txt` file, packaging the script, etc. But I'm asking about cases where that ship has sailed. All I have is a script that optimistically imports stuff.
Python already knows what package it's *supposed* to be, since it's named in the `ModuleNotFoundError`. Is there a way to tell it to react by attempting a `pip install` on that, rather than raising an exception?
------
I am aware that:
* `ModuleNotFoundError` may raise not just for missing packages, but also modules (eg. `foo.py`) in the same directory. I'm happy with a solution that blindly assumes it's always a PyPi packages.
* [Some](https://pypi.org/project/xdg-base-dirs/) packages use a different name for `pip install` and `import`. I'm happy with a solution that fails or installs the wrong package in this case.
* It is dangerous to blindly install packages from PyPi. I'm okay with the risks.

#1: Initial revision by

matthewsnyder‭ · 2023-06-16T22:37:48Z (over 1 year ago)

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Automatically install all packages needed

When running various Python scripts, I often need to do this annoying dance:
```shell
$ python script.py
...
ModuleNotFoundError: No module named 'foo'
$ pip install foo
$ python script.py
...
ModuleNotFoundError: No module named 'bar'
$ pip install bar
$ python script.py
...
ModuleNotFoundError: No module named 'baz'
$ pip install bar
$ python script.py
(correct output from script)
```

Yes, I know this can be solved by creating a `requirements.txt` file, packaging the script, etc. But I'm asking about cases where that ship has sailed. All I have is a script that optimistically imports stuff.

Python already knows what package it's *supposed* to be, since it's named in the `ModuleNotFoundError`. Is there a way to tell it to react by attempting a `pip install` on that, rather than raising an exception?

------

I am aware that:

* `ModuleNotFoundError` may raise not just for missing packages, but also modules (eg. `foo.py`) in the same directory. I'm happy with a solution that blindly assumes it's always a PyPi packages.
* [Some](https://pypi.org/project/xdg-base-dirs/) packages use a different name for `pip install` and `import`. I'm happy with a solution that fails or installs the wrong package in this case.
* It is dangerous to blindly install packages from PyPi. I'm okay with the risks.

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