Scrapy install cryptography & gt; = 0.2.1 Nopackage & #3

1. When installed scrapy runs, the following error occurs: cryptography0.2.1. Therefore, easy_installcryptography is run, but Nopackagelibffifound error is reported. 2. Check yuminstalllibffi but the error message "libffi has been installed. 3.

1. When installed scrapy runs, the following error occurs: cryptography = 0.2.1: easy_install cryptography is run, but No package 'libffi' found is reported. 2. Check yum installlibffi, but the following error occurs: libffi has been installed. 3.

1. An error occurred while running the installed scrapy.

Pkg_resources.DistributionNotFound: cryptography> = 0.2.1 run

Easy_install cryptography but No package 'libffi' found error is reported

2. Check yum install libffi, but the system prompts that libffi has been installed.

3 because easy_install cryptography is compiled and installed, libffi-devel is required.

Run yum install libffi-devel and run easy_install cryptography.