about why you have installed Python to install Python-dev

The Linux distribution typically splits the header file and associated Pkg-config of the class library into a separate Xxx-dev (EL) package.

In Python, for example, you need to python-dev in the following situations

• You need to install an out-of-the-source Python class library that contains C + + files that need to be compiled to call the Python API
• You write your own program to compile a link libpythonxx. (A|SO)
  (Note: The above does not include the use of Ctypes/ffi or bare Dlsym method directly call libpython.so)

Other normal use of Python or by installing the Python class library within the source does not require python-dev.

Do

1. You can check the package with Python-devel first

Yum Search Python | grep python-devel

2.64-bit installation python-devel.x86_64,32-bit install python-devel.i686, I install here:

sudo yum install python-devel.x86_64

about why you have installed Python to install Python-dev