In current pip (version 1.3.1) you can see the dependencies of an installed package by using:

    pip show &lt;package&gt;

Note that this answer from 2012 is out of date. First, the workaround, which the answer already said you probably shouldn&#39;t do in 2012, now you _can&#39;t_ do it. If you want a similar workaround, you could use `pip download`, but it&#39;s even less likely to be what you want. Especially since `pip show` has been improved. Fortunately, the question has been marked as a dup of a later question, so there&#39;s no reason to read this answer except for historical purposes.

---

You can&#39;t, at least not directly.

You can import the pip module in your own code and download the requirements file and then iterate through it. Or, from the command line, you can `pip install --no-install --verbose`. 

But really, unless this is something you need to automate, it&#39;s probably easier to just go to http://pypi.python.org/ and search for the package there instead of using pip.

I know that when using `gem install`, the gem will be stored under /home/username/.rvm/gems/, under which gemset the gem was installed.

But if I use Bundler and specify the gem in the Gemfile, when I run bundle install, where will those gems be stored? And what if I already installed the gem using `gem install`, if I run bundle install, will it use the previous gem installed using `gem install`?

Where does bundler store gems?

    &gt;&gt;&gt; match = re.findall(r&#39;\w\w&#39;, &#39;hello&#39;)
    &gt;&gt;&gt; print match
    [&#39;he&#39;, &#39;ll&#39;]

Since \w\w means two characters, &#39;he&#39; and &#39;ll&#39; are expected. But why do &#39;el&#39; and &#39;lo&#39; **not** match the regex?

    &gt;&gt;&gt; match1 = re.findall(r&#39;el&#39;, &#39;hello&#39;)
    &gt;&gt;&gt; print match1
    [&#39;el&#39;]
    &gt;&gt;&gt;

How to find overlapping matches with a regexp?

How do I list the dependencies for a package using pip?

Listing the dependencies of a package using pip

<p>How do I list the dependencies for a package using pip?</p>


I am using BeautifulSoup to scrape an URL and I had the following code, to find the `td` tag whose class is `&#39;empformbody&#39;`:

    import urllib
    import urllib2
    from BeautifulSoup import BeautifulSoup
    
    url =  &quot;http://www.example.com/servlet/av/ResultTemplate=AVResult.html&quot;
    req = urllib2.Request(url)
    response = urllib2.urlopen(req)
    the_page = response.read()
    soup = BeautifulSoup(the_page)

    soup.findAll(&#39;td&#39;,attrs={&#39;class&#39;:&#39;empformbody&#39;})

Now in the above code we can use `findAll` to get tags and information related to them, but I want to use XPath. Is it possible to use XPath with BeautifulSoup? If possible, please provide me example code.

can we use XPath with BeautifulSoup?

To implement a subscriptable object is easy, just implement `__getitem__` in this object&#39;s class definition.&lt;br/&gt;
But now I want to implement a subscriptable class. For example, I want to implement this code:

    class Fruit(object):
        Apple = 0
        Pear = 1
        Banana = 2
        #________________________________ 
        #/ Some other definitions,         \
        #\ make class &#39;Fruit&#39; subscriptable. /
        # -------------------------------- 
        #        \   ^__^
        #         \  (oo)\_______
        #            (__)\       )\/\
        #                ||----w |
        #                ||     ||

    print Fruit[&#39;Apple&#39;], Fruit[&#39;Banana&#39;]
    #Output: 0 2
I know `getattr` can do the same thing, but I feel subscript accessing is more elegant.

How to implement a subscriptable class in Python (subscriptable class, not subscriptable object)?

I have the following code:

    import re
    #open the xml file for reading:
    file = open(&#39;path/test.xml&#39;,&#39;r+&#39;)
    #convert to string:
    data = file.read()
    file.write(re.sub(r&quot;&lt;string&gt;ABC&lt;/string&gt;(\s+)&lt;string&gt;(.*)&lt;/string&gt;&quot;,r&quot;&lt;xyz&gt;ABC&lt;/xyz&gt;\1&lt;xyz&gt;\2&lt;/xyz&gt;&quot;,data))
    file.close()

where I&#39;d like to replace the old content that&#39;s in the file with the new content. However, when I execute my code, the file &quot;test.xml&quot; is appended, i.e. I have the old content follwed by the new &quot;replaced&quot; content. What can I do in order to delete the old stuff and only keep the new?

Replace and overwrite instead of appending

What is the difference between 
matplotlib.pyplot and matplotlib.pylab?

Which is preferred for what usage?

I am a little confused, because it seems like independent from which I import, I can do the same things. What am I missing?

What is the difference between pylab and pyplot?

I want to make a package to depend the particular version range e.g. `&gt;= 0.5.0, &lt; 0.7.0`.  Is it possible in `install_requires` option, and if so how should it be?

How to specify version ranges in install_requires (setuptools, distribute)

I am having trouble installing psycopg2. I get the following error when I try to `pip install psycopg2`:

    Error: pg_config executable not found.
    
    Please add the directory containing pg_config to the PATH
    
    or specify the full executable path with the option:
    
    
    
        python setup.py build_ext --pg-config /path/to/pg_config build ...
    
    
    
    or with the pg_config option in &#39;setup.cfg&#39;.
    
    ----------------------------------------
    Command python setup.py egg_info failed with error code 1 in /tmp/pip-build/psycopg2


But the problem is `pg_config` is actually in my `PATH`; it runs without any problem:

    $ which pg_config
    /usr/pgsql-9.1/bin/pg_config

I tried adding the pg_config path to the `setup.cfg` file and building it using the source files I downloaded from their website (http://initd.org/psycopg/) and I get the following error message!

    Error: Unable to find &#39;pg_config&#39; file in &#39;/usr/pgsql-9.1/bin/&#39;


But it is actually THERE!!!

I am baffled by these errors. Can anyone help please?

By the way, I `sudo` all the commands. Also I am on RHEL 5.5.

pg_config executable not found

To create Python virtual environments I use virtualenv and pip. The workflow is very simple:

    $ virtualenv project
    $ cd project
    $ . bin/activate
    $ pip install -r /path/to/requirements/req1.txt
    $ pip install -r /path/to/requirements/req2.txt

The number of different requirement files can grow enough to make handy to have a way to include them at once, so I&#39;d rather prefer to say:

    $ pip install -r /path/to/requirements/req1_req2.txt

with `req1_req2.txt` containing something like:

    include /path/to/requirements/req1.txt
    include /path/to/requirements/req2.txt

or otherwise:

    $ pip install -r /path/to/requirements/*.txt

None of that works and however much simple it could be, I can&#39;t figure out how to do what I want.

Any suggestion?

Split requirements files in pip

Made the upgrade to Mac OS X 10.8 (Mountain Lion) and get now the following error when trying to call `$ pip`:

    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;/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py&quot;, line 2603, in &lt;module&gt;
        working_set.require(__requires__)
      File &quot;/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py&quot;, line 666, in require
        needed = self.resolve(parse_requirements(requirements))
      File &quot;/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py&quot;, line 565, in resolve
        raise DistributionNotFound(req)  # XXX put more info here
    pkg_resources.DistributionNotFound: pip==1.1


Update: Tried to reinstall by doing the install procedure again (with http://www.pip-installer.org/en/latest/installing.html#using-the-installer and `easy_install`), but didn&#39;t work, got the same error.

Tried now the following: Calling `$ sudo pip` and the above error disappears. Strange is, that the directories which could not befound in the above error message point to /System/Library/... while the python installation is (new ?) to find in /Library/Frameworks/..:

    $ which python
    /Library/Frameworks/Python.framework/Versions/Current/bin/python

Any idea how to get rid of the sudo?

Python pip broken after OS X 10.8 upgrade

When I do a &quot;pip install -e ...&quot; to install from a git repo, I have to specify #egg=somename or pip complains. For example:

    pip install -e git://github.com/hiidef/oauth2app.git#egg=oauth2app

What&#39;s the significance of this &quot;egg&quot; string?

Why #egg=foo when pip-installing from git repo

I need to install a package from PyPi straight within my script.
Maybe there&#39;s some module or `distutils` (`distribute`, `pip` etc.) feature which allows me to just execute something like `pypi.install(&#39;requests&#39;)` and requests will be installed into my virtualenv.

Content Type	Original Author	Original Content on Stackoverflow
Question	jan	View Question on Stackoverflow
Solution 1 - Python	kdb	View Answer on Stackoverflow
Solution 2 - Python	abarnert	View Answer on Stackoverflow

Listing the dependencies of a package using pip

Python Problem Overview

Python Solutions

Solution 1 - Python

Solution 2 - Python

How to find overlapping matches with a regexp?

Where does bundler store gems?

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