title: How to install from requirements.txt
body: <p>I have to install python packages from requirements files that's provided to me. However, when I use <code>pip install -r requirements.txt</code> command I get an error saying <code>ERROR: Invalid requirement     (from line 3 in  requirements.txt</code>. And when I comment the third line the error just continues to be there for the next lines. What does that mean and how can I install packages from the file?</p>
  <p>Here's how the file contents look like:</p>
  <pre><code># Name                    Version                   Build  Channel
  alabaster                 0.7.12                   py36_0
  altgraph                  0.17                     pypi_0    pypi
  appdirs                   1.4.4                      py_0
  argh                      0.26.2                   py36_0
  astroid                   2.4.2                    py36_0
  async_generator           1.10             py36h28b3542_0
  atomicwrites              1.4.0                      py_0
  attrs                     20.3.0             pyhd3eb1b0_0
  auto-py-to-exe            2.7.11                   pypi_0    pypi
  autopep8                  1.5.4                      py_0
  babel                     2.9.0              pyhd3eb1b0_0
  backcall                  0.2.0                      py_0
  bcrypt                    3.2.0            py36he774522_0
  black                     19.10b0                    py_0
  bleach                    3.2.2              pyhd3eb1b0_0
  bottle                    0.12.19                  pypi_0    pypi
  ... So on
  </code></pre>
  <p>I am using new environment in Anaconda with python version <code>3.6.12</code>.</p>