pip fails to find any packages from requirements.txt

Question

I have a requirements.txt file with following packages listed:

appdirs==1.4.3
APScheduler==3.3.1
asn1crypto==0.22.0
bcrypt==3.1.3
boto3==1.4.4
botocore==1.5.72

When I do a pip install -q -U -r requirements.txt ; I receive following error:

Could not find a version that satisfies the requirement appdirs==1.4.3 (from -r requirements.txt (line 1)) (from versions: )
No matching distribution found for appdirs==1.4.3 (from -r requirements.txt (line 1))

But, the following works:

$ pip install appdirs
Collecting appdirs
  Downloading appdirs-1.4.3-py2.py3-none-any.whl
Installing collected packages: appdirs
Successfully installed appdirs-1.4.3

Once I had manually installed appdirs, I tried running from requirements again:

$ pip install -q -U -r requirements.txt
  Could not find a version that satisfies the requirement APScheduler==3.3.1 (from -r requirements.txt (line 2)) (from versions: )
No matching distribution found for APScheduler==3.3.1 (from -r requirements.txt (line 2))

I tried specifying the exact version for the next command now:

$ pip install APScheduler==3.3.1           
Collecting APScheduler==3.3.1
  Downloading APScheduler-3.3.1-py2.py3-none-any.whl (56kB)
    100% |████████████████████████████████| 61kB 2.8MB/s 
Collecting tzlocal>=1.2 (from APScheduler==3.3.1)
  Downloading tzlocal-1.4.tar.gz
Collecting funcsigs; python_version == "2.7" (from APScheduler==3.3.1)
  Downloading funcsigs-1.0.2-py2.py3-none-any.whl
Collecting six>=1.4.0 (from APScheduler==3.3.1)
  Downloading six-1.11.0-py2.py3-none-any.whl
Collecting pytz (from APScheduler==3.3.1)
  Downloading pytz-2017.2-py2.py3-none-any.whl (484kB)
    100% |████████████████████████████████| 491kB 2.2MB/s 
Requirement already satisfied: setuptools>=0.7 in ./.env/lib/python2.7/site-packages (from APScheduler==3.3.1)
Collecting futures; python_version == "2.7" (from APScheduler==3.3.1)
  Downloading futures-3.1.1-py2-none-any.whl
Building wheels for collected packages: tzlocal
  Running setup.py bdist_wheel for tzlocal ... done
  Stored in directory: $HOME/.cache/pip/wheels/dc/d6/f0/84194ccbdd3e2551bdb207e1fc1925efd32956c5767328103b
Successfully built tzlocal
Installing collected packages: pytz, tzlocal, funcsigs, six, futures, APScheduler
Successfully installed APScheduler-3.3.1 funcsigs-1.0.2 futures-3.1.1 pytz-2017.2 six-1.11.0 tzlocal-1.4

How is pip not able to find the packages if specifying the requirements file? And why does it keep finding the same packages without it?

PS: Everything is being done inside a virtualenv named .env .

---

$ pip -V
pip 9.0.1 from $PWD/.env/lib/python2.7/site-packages (python 2.7)
$ python -V
Python 2.7.13
$ which python
$PWD/.env/bin/python

---

Doing a pip --verbose command gives:

Collecting asn1crypto==0.22.0 (from -r requirements.txt (line 3))
  1 location(s) to search for versions of asn1crypto:
  * https://pip.<domain>/asn1crypto/
  Getting page https://pip.<domain>/asn1crypto/
  Looking up "https://pip.<domain>/asn1crypto/" in the cache
  No cache entry available
  Starting new HTTPS connection (1): pip.<domain>
  "GET /asn1crypto/ HTTP/1.1" 303 0
  Status code 303 not in [200, 203, 300, 301]
  Looking up "https://pip.<domain>/simple/asn1crypto/" in the cache
  No cache entry available
  "GET /simple/asn1crypto/ HTTP/1.1" 303 0
  Status code 303 not in [200, 203, 300, 301]
  Starting new HTTP connection (1): pypi.python.org
  "GET /simple/asn1crypto/ HTTP/1.1" 403 16
  Could not fetch URL https://pip.<domain>/asn1crypto/: 403 Client Error: SSL is required for url: http://pypi.python.org/simple/asn1crypto/ - skipping
  Could not find a version that satisfies the requirement asn1crypto==0.22.0 (from -r requirements.txt (line 3)) (from versions: )
Cleaning up...
No matching distribution found for asn1crypto==0.22.0 (from -r requirements.txt (line 3))

where https://pip.<domain> is our custom hosted pypi-server layer .

Answer 1

You need to set the fallback_url on your pypi server to an https URL because pypi.python.org now only allows https requests. See this link (python mailing list) for more information.