Now there is (disclaimer: I did it).

All you need is to install `pip-chill` from PyPI and run `pip-chill` from your Python environment.

If you are feeling adventurous and don&#39;t want to pin versions (or want to use pip-compile), you can use `pip-chill --no-version` and it&#39;ll give you the minimal requirements for your current environment.

https://github.com/rbanffy/pip-chill

There is no way to create &quot;the most simplified requirements.txt&quot; with pip - and I don&#39;t know if you would need it in this case.

It is good to have **all packages** in the requirements.txt, because you are sure about what dependencies versions work with your environment.

Think about paramiko getting updated, and breaking backwards compatibilities: you would have problems.


I think the simply way to remove version is cut `-d&quot;=&quot; -f1` after having run `pip freeze`. 

    pip3 freeze | cut -d&quot;=&quot; -f1 

[pipdeptree](https://github.com/naiquevin/pipdeptree) is another option.

It produces full requirements.txt (with `pipdeptree -f`) like this:

    jupyter==1.0.0
      ipykernel==5.4.3
        ipython==7.19.0
          backcall==0.2.0
          decorator==4.4.2
          jedi==0.17.2
            parso==0.7.1

This file serves two purposes:

* Used as a traditional requirements.txt fed to `pip install`;
* Used as a developer-friendly packages list (like the one created by `pip-chill`) simply with `grep &#39;^\w&#39; requirements.txt`.

I want to get a fixed length list from another list like:

    a = [&#39;a&#39;,&#39;b&#39;,&#39;c&#39;]
    b = [0,0,0,0,0,0,0,0,0,0]

And I want to get a list like this: `[&#39;a&#39;,&#39;b&#39;,&#39;c&#39;,0,0,0,0,0,0,0]`. In other words, if `len(a) &lt; len(b)`, i want to fill up list `a` with values from list `b` up to length of the list `b`, somewhat similar to what [`str.ljust`](http://docs.python.org/2.7/library/stdtypes.html?highlight=ljust#str.ljust) does.

This is my code:

    a=[&#39;a&#39;,&#39;b&#39;,&#39;c&#39;]
    b = [0 for i in range(5)]
    b = [a[i] for i in b if a[i] else i]
    
    print a


But it shows error:

      File &quot;c.py&quot;, line 7
        b = [a[i] for i in b if a[i] else i]
                                        ^
    SyntaxError: invalid syntax

What can i do?


how to fill a list with 0 using python 

I have an `EditText` with the property:

    android:minLines=&quot;3&quot;


However, when I start typing, it types in the middle of the `EditText`.

Is there any way to get this to start typing at the top left of the `EditText` area?

Is there anyway to make an EditText start typing at the top left corner of the EditText?

When I do `pip freeze` I get the packages I&#39;ve explicitly installed plus those packages that are dependencies of those packages.

For example:

    $ pip install fabric
    ...
    $ pip freeze
    Fabric==1.0.1
    paramiko==1.7.6
    pycrypto==2.3

Ok fine but then I move to install this requirements.txt on another environment with `pip install` I&#39;d get the same result with the last 2 lines removed.

So my question is: how I can I create the most simplified requirements.txt where all calculable dependencies are not shown?

pip freeze without dependencies of installed packages

When I do <code>pip freeze</code> I get the packages I've explicitly installed plus those packages that are dependencies of those packages.
For example:
<pre><code class="hljs language-ini">$ pip install fabric
...
$ pip freeze
Fabric==1.0.1
paramiko==1.7.6
pycrypto==2.3
</code></pre>
Ok fine but then I move to install this requirements.txt on another environment with <code>pip install</code> I'd get the same result with the last 2 lines removed.
So my question is: how I can I create the most simplified requirements.txt where all calculable dependencies are not shown?

I&#39;ve read the examples in python docs, but still can&#39;t figure out what this method means. Can somebody help? Here are two examples from the python docs

    &gt;&gt;&gt; from collections import defaultdict

    &gt;&gt;&gt; s = &#39;mississippi&#39;
    &gt;&gt;&gt; d = defaultdict(int)
    &gt;&gt;&gt; for k in s:
    ...     d[k] += 1
    ...
    &gt;&gt;&gt; d.items()
    [(&#39;i&#39;, 4), (&#39;p&#39;, 2), (&#39;s&#39;, 4), (&#39;m&#39;, 1)]

and

    &gt;&gt;&gt; s = [(&#39;yellow&#39;, 1), (&#39;blue&#39;, 2), (&#39;yellow&#39;, 3), (&#39;blue&#39;, 4), (&#39;red&#39;, 1)]
    &gt;&gt;&gt; d = defaultdict(list)
    &gt;&gt;&gt; for k, v in s:
    ...     d[k].append(v)
    ...
    &gt;&gt;&gt; d.items()
    [(&#39;blue&#39;, [2, 4]), (&#39;red&#39;, [1]), (&#39;yellow&#39;, [1, 3])]

the parameters `int` and `list` are for what? 

How does collections.defaultdict work?

I would like to print a specific Python dictionary key:

```
mydic = {}
mydic[&#39;key_name&#39;] = &#39;value_name&#39;
```
    
Now I can check if `mydic.has_key(&#39;key_name&#39;)`, but what I would like to do is print the name of the key `&#39;key_name&#39;`. Of course I could use `mydic.items()`, but I don&#39;t want **all** the keys listed, merely one specific key. For instance I&#39;d expect something like this (in pseudo-code):

```
print &quot;the key name is&quot;, mydic[&#39;key_name&#39;].name_the_key(), &quot;and its value is&quot;, mydic[&#39;key_name&#39;]
```

Is there any `name_the_key()` method to print a key name?


----------


**Edit:**
OK, thanks a lot guys for your reactions! :) I realise my question is not well formulated and trivial. I just got confused because I realised `&#39;key_name&#39;` and `mydic[&#39;key_name&#39;]` are two different things and I thought it would be incorrect to print the `&#39;key_name&#39;` out of the dictionary context. But indeed I can simply use the `&#39;key_name&#39;` to refer to the key! :)



How to print a dictionary&#39;s key?

What is the recommended way of serializing a [`namedtuple`][1] to json with the field names retained?

Serializing a `namedtuple` to json results in only the values being serialized and the field names being lost in translation. I would like the fields also to be retained when json-ized and hence did the following:

    class foobar(namedtuple(&#39;f&#39;, &#39;foo, bar&#39;)):
        __slots__ = ()
        def __iter__(self):
            yield self._asdict()

The above serializes to json as I expect and behaves as `namedtuple` in other places I use (attribute access etc.,) except with a non-tuple like results while iterating it (which fine for my use case).

What is the &quot;correct way&quot; of converting to json with the field names retained?


  [1]: http://docs.python.org/dev/library/collections.html#collections.namedtuple

Serializing a Python namedtuple to json

I&#39;m looking for a way to pretty-print tables like this:

    =======================
    | column 1 | column 2 |
    =======================
    | value1   | value2   |
    | value3   | value4   |
    =======================

I&#39;ve found the [asciitable][1] library but it doesn&#39;t do the borders, etc. I don&#39;t need any complex formatting of data items, they&#39;re just strings. I do need it to auto-size columns.

Do other libraries or methods exist, or do I need to spend a few minutes writing my own?

  [1]: http://cxc.harvard.edu/contrib/asciitable/


How can I pretty-print ASCII tables with Python?

I have a python program I want to install into my virtualenv - it&#39;s a zip package that I need to unzip and then run a setup.py program - but my question is more regarding how to get these unzipped files into my virtualenv so that the package gets installed into the virtualenv&#39;s site-packages folder?

I can also install from inside my virtualenv using `pip install &lt;package name&gt;`, but for some reason, the package that PIP downloads is out of date.

So - can someone tell me a few easy steps for installing a package manually?

So far I have the basic commands to load up the Virtualenv:

    -bash-3.2$ source ~/.bashrc
    -bash-3.2$ workon test
    (test)-bash-3.2$ //Now I&#39;m working on my virtualenv, but where do I go after this??

So - does it matter where I unzip the python package/program to - or should I be logged in to the virtualenv first before unzipping? After I load up the virtualenv and I&#39;m inside using it with the &#39;workon test&#39; command, will any python package I install, regardless of the directory I find it, install itself into the proper virtualenv&#39;s site-packages folder?

Option 1 is to unzip the python program into /home/username/tmp - then log into my virtualenv, navigate to that folder and run the setup.py program - assuming that the virtualenv will transfer all relevant files to it&#39;s own site-packages folder.

OR scenario 2 is to unzip the files directly into site-packages, and run it from there (after logging in to the virtualenv), etc

Thank you for helping a Python clutz with this! 

Python - manually install package using virtualenv

Whenever i try to use pip I get an error. For exampple:

    $ sudo pip install gevent-websocket

    Traceback (most recent call last):  
    File &quot;/usr/local/bin/pip&quot;, line 5, in &lt;module&gt;
    from pkg_resources import load_entry_point
    File &quot;/usr/lib/python2.7/dist-packages/pkg_resources.py&quot;, line 2675, in &lt;module&gt;
    parse_requirements(__requires__), Environment()
    File &quot;/usr/lib/python2.7/dist-packages/pkg_resources.py&quot;, line 552, in resolve
    raise DistributionNotFound(req)
    pkg_resources.DistributionNotFound: pip==0.8.1

I feel tempted to change the value of into pip==0.8.2.. but I dont feel dealing with the consequences of &#39;hacking&#39; up my installation...
I&#39;m running python 2.7 and pip is at version 0.8.2.

pip broke. how to fix DistributionNotFound error?

In my application I would like to use:

- `packageA`, which requires `packageX==1.3`
- `packageB`, which requires `packageX==1.4`
- `packageX==1.5`

How can I install multiple versions of `packageX` with pip to handle this situation?


Installing multiple versions of a package with pip

I want to install [pip][1]. It should support Python 3, but it requires setuptools, which is available only for Python 2.

How can I install pip with Python 3?


  [1]: http://pypi.python.org/pypi/pip

How to install pip with Python 3?

Is there a way to find all Python PyPI packages that were installed with easy_install or pip?  I mean, excluding everything that was/is installed with the distributions tools (in this case apt-get on Debian).


Find all packages installed with easy_install/pip?

Developing a Django web app, I have a list of packages I need to install in a virtualenv.  Say:

    Django==1.3.1
    --extra-index-url=http://dist.pinaxproject.com/dev/
    Pinax==0.9b1.dev10
    git+git://github.com/pinax/pinax-theme-bootstrap.git@cff4f5bbe9f87f0c67ee9ada9aa8ae82978f9890
    # and other packages

Initially I installed them manually, one by one, along the development. This installed the required dependencies and I finally used `pip freeze` before deploying the app.

Problem is, as I upgraded some packages, some dependencies are no longer used nor required but they keep being listed by `pip freeze`.

Now, I&#39;d like to set up a new virtualenv this way:

 - put the needed packages (without their dependencies) in a requirement file, &lt;br /&gt;
   like `manual-requirements.txt`
 - install them with their dependencies &lt;br /&gt;
   `pip install -r manual-requirement.txt` (← problem, this does not install the dependencies)
 - freeze the full virtualenv &lt;br /&gt;
   `pip freeze -r manual-requirements.txt &gt; full-requirements.txt`&lt;br /&gt;
   and deploy.

Any way to do this without manually re-installing the packages in a new virtualenv to get their dependencies ? This would be error-prone and I&#39;d like to automate the process of cleaning the virtualenv from no-longer-needed old dependencies.

**edit:** actually, pip _does_ install dependencies not explicitly listed in the requirement file, even if [the documentation][1] tells us that such files are flat. I was wrong about which dependencies i expected to be installed. I&#39;ll let this question for anyone in doubt about pip not installing all dependencies. 


  [1]: http://www.pip-installer.org/en/latest/requirements.html

tell pip to install the dependencies of packages listed in a requirement file

Without going through with the installation, I want to quickly see all the packages that ```pip install``` would install.

Is there a way to list pip dependencies/requirements?

I have a `requirements.txt` file that I&#39;m using with Travis-CI.  It seems silly to duplicate the requirements in both `requirements.txt` and `setup.py`, so I was hoping to pass a file handle to the `install_requires` kwarg in `setuptools.setup`.

Is this possible? If so, how should I go about doing it?

Here is my `requirements.txt` file:

    guessit&gt;=0.5.2
    tvdb_api&gt;=1.8.2
    hachoir-metadata&gt;=1.3.3
    hachoir-core&gt;=1.3.3
    hachoir-parser&gt;=1.3.4

Reference requirements.txt for the install_requires kwarg in setuptools setup.py file

I&#39;ve installed a library using the command

    pip install git+git://github.com/mozilla/elasticutils.git

which installs it directly from a Github repository.  This works fine and I want to have that dependency in my `requirements.txt`.  I&#39;ve looked at other tickets like [this][1] but that didn&#39;t solve my problem.  If I put something like

    -f git+git://github.com/mozilla/elasticutils.git
    elasticutils==0.7.dev

in the `requirements.txt` file, a `pip install -r requirements.txt` results in the following output:

    Downloading/unpacking elasticutils==0.7.dev (from -r requirements.txt (line 20))
      Could not find a version that satisfies the requirement elasticutils==0.7.dev (from -r requirements.txt (line 20)) (from versions: )
    No distributions matching the version for elasticutils==0.7.dev (from -r requirements.txt (line 20))

The [documentation of the requirements file][2] does not mention links using the `git+git` protocol specifier, so maybe this is just not supported.

Does anybody have a solution for my problem?


  [1]: https://stackoverflow.com/questions/9024607/how-to-link-to-forked-package-in-distutils-without-breaking-pip-freeze
  [2]: https://pip.pypa.io/en/stable/reference/pip_install/#requirements-file-format

How to state in requirements.txt a direct github source

I have a project with multiple package dependencies, the main requirements being listed in `requirements.txt`. When I call `pip freeze` it prints the currently installed packages as plain list. I would prefer to also get their dependency relationships, something like this:

    Flask==0.9
        Jinja2==2.7
        Werkzeug==0.8.3

    Jinja2==2.7

    Werkzeug==0.8.3

    Flask-Admin==1.0.6
        Flask==0.9
        Jinja2==2.7
        Werkzeug==0.8.3

The goal is to detect the dependencies of each specific package:

    Werkzeug==0.8.3
        Flask==0.9
        Flask-Admin==1.0.6

And insert these into my current `requirements.txt`. For example, for this input:

    Flask==0.9
    Flask-Admin==1.0.6
    Werkzeug==0.8.3


I would like to get:

    Flask==0.9
        Jinja2==2.7
    Flask-Admin==1.0.6
    Werkzeug==0.8.3

Is there any way show the dependencies of installed pip packages?

Content Type	Original Author	Original Content on Stackoverflow
Question	Tom Viner	View Question on Stackoverflow
Solution 1 - Python	rbanffy	View Answer on Stackoverflow
Solution 2 - Python	Hugo Tavares	View Answer on Stackoverflow
Solution 3 - Python	haulpd	View Answer on Stackoverflow
Solution 4 - Python	Leo	View Answer on Stackoverflow

pip freeze without dependencies of installed packages

Python Problem Overview

Python Solutions

Solution 1 - Python

Solution 2 - Python

Solution 3 - Python

Solution 4 - Python

Is there anyway to make an EditText start typing at the top left corner of the EditText?

how to fill a list with 0 using python

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