title: I have problem installing pyqt5 tools with pip. any solution?
body: <p>I tried to install pyqt5-tools with pip but this error occurred:</p>
  <pre><code>ERROR: pyqt5==5.14.0 from https://files.pythonhosted.org/packages/7c/5b/e760ec4f868cb77cee45b4554bf15d3fe6972176e89c4e3faac941213694/PyQt5-5.14.0.tar.gz#sha256=0145a6b7de15756366decb736c349a0cb510d706c83fda5b8cd9e0557bc1da72 (from pyqt5-tools) has a pyproject.toml file that does not comply with PEP 518: 'build-system.requires' contains an invalid requirement: 'sip &gt;=5.0.1 &lt;6'
  </code></pre>
  <p>I already have installed pyqt5 without problem.</p>