pyconfig.h missing during "pip install cryptography"

For Ubuntu, python2

apt-get install python-dev

For Ubuntu, python3

apt-get install python3-dev

python cryptography centos scrapy pip

I have solved it by myself. for the default python of centos, there is only a file named pyconfg-64.h in usr/include/python2.7/,So run the command

yum install python-devel

Then it works.

python cryptography centos scrapy pip

for python3.6,

apt-get install python3.6-dev

and

apt-get install libssl-dev libffi-dev

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