How To Fix Running Setup.py Install For Twisted Error When Install Python Scrapy Windows Tricks

This article will tell you how to install python scrapy and how to fix the error Running setup.py install for Twisted … error during the installation process.

1. Install Scrapy In Python Steps & Fix Can Not Install Twisted Error.

Open a terminal and run the command pip install scrapy to install scrapy.

During the installation, you may encounter below error messages.

Using legacy 'setup.py install' for Twisted, since package 'wheel' is not installed

Installing collected packages: Twisted, scrapy

Running setup.py install for Twisted ... error

This means the python scrapy needed Twisted library is not installed successfully.
Go to the python Twisted GitHub page, we can see that it supports python version 3.5, 3.6 and 3.7. But my python version is 3.9. So I need to install python 3.7 to fix it ( please read article Installed Python 3 On Mac OS X But It Still Use Python 2.7 to learn how to install multiple python version ).
```
$ python -V
Python 3.9.3
```

If the error still exists after you install python 3.7, you can run the command pip install Twisted to install the Twisted library manually.
```
pip install Twisted
```
But above command may still encounter the error again.
Now you can go to https://pypi.org/project/Twisted/#files to download the related Twisted library installation file to your local directory.

Please choose the download file carefully. The download file name is something like Twisted-20.3.0-cp27-cp27m-macosx_10_6_intel.whl, I use macOS, so I download the macosx version. The cp27 in the download file name means this Twisted packages only support python 2.7.
Because my python version is 3.7, so when I run the command $ pip install Twisted-20.3.0-cp27-cp27m-macosx_10_6_intel.whl to install it, I meet below error messages.
```
$ pip install Twisted-20.3.0-cp27-cp27m-macosx_10_6_intel.whl 
ERROR: Twisted-20.3.0-cp27-cp27m-macosx_10_6_intel.whl is not a supported wheel on this platform.
```

So to install Twisted on python version 3.7, I should download the file Twisted-20.3.0-cp37-cp37m-macosx_10_6_intel.whl, and run below command to install it.

$ pip install Twisted-20.3.0-cp37-cp37m-macosx_10_6_intel.whl
$ pip show Twisted
Name: Twisted
Version: 20.3.0
Summary: An asynchronous networking framework written in Python
Home-page: https://twistedmatrix.com/
Author: Twisted Matrix Laboratories
Author-email: twisted-python@twistedmatrix.com
License: MIT
Location: /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages
Requires: PyHamcrest, constantly, zope.interface, incremental, attrs, hyperlink, Automat
Required-by: Scrapy

Now run pip install scrapy command again, it will install python scrapy successfully.

$ pip install scrapy

$ pip show scrapy
Name: Scrapy
Version: 2.4.1
Summary: A high-level Web Crawling and Web Scraping framework
Home-page: https://scrapy.org
Author: Scrapy developers
Author-email: None
License: BSD
Location: /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages
Requires: zope.interface, pyOpenSSL, cssselect, protego, lxml, Twisted, itemadapter, w3lib, cryptography, itemloaders, PyDispatcher, parsel, service-identity, queuelib
Required-by:

1. Install Scrapy In Python Steps & Fix Can Not Install Twisted Error.

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