我已经在Cygwin中安装了版本2和版本3的python，后来又安装了pip。但是，每当我尝试使用pip安装任何模块时，都会出现以下错误：
$ pip install regex
Collecting regex
Using cached https://files.pythonhosted.org/packages/2a/0a/944977367c8a6cfcfa6fcb8ac6b1f0f9a667c1f34194091c766b5d7c44d7/regex-2018.08.29.tar.gz
Building wheels for collected packages: regex
Running setup.py bdist_wheel for regex ... error
Complete output from command /usr/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-install-pg3NIK/regex/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" bdist_wheel -d /tmp/pip-wheel-6upLG0 --python-tag cp27:
/usr/lib/python2.7/site-packages/setuptools/dist.py:398: UserWarning: Normalizing '2018.08.29' to '2018.8.29'
normalized_version,
running bdist_wheel
running build
running build_py
creating build
creating build/lib.cygwin-2.11.1-x86_64-2.7
copying regex_2/regex.py -> build/lib.cygwin-2.11.1-x86_64-2.7
copying regex_2/_regex_core.py -> build/lib.cygwin-2.11.1-x86_64-2.7
copying regex_2/test_regex.py -> build/lib.cygwin-2.11.1-x86_64-2.7
running build_ext
building '_regex' extension
creating build/temp.cygwin-2.11.1-x86_64-2.7
creating build/temp.cygwin-2.11.1-x86_64-2.7/regex_2
gcc -fno-strict-aliasing -ggdb -O2 -pipe -Wimplicit-function-declaration -fdebug-prefix-map=/usr/src/ports/python2/python2-2.7.14-1.x86_64/build=/usr/src/debug/python2-2.7.14-1 -fdebug-prefix-map=/usr/src/ports/python2/python2-2.7.14-1.x86_64/src/Python-2.7.14=/usr/src/debug/python2-2.7.14-1 -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I/usr/include/python2.7 -c regex_2/_regex.c -o build/temp.cygwin-2.11.1-x86_64-2.7/regex_2/_regex.o
regex_2/_regex.c:46:10: fatal error: Python.h: No such file or directory
#include "Python.h"
^~~~~~~~~~
compilation terminated.
error: command 'gcc' failed with exit status 1
----------------------------------------
Failed building wheel for regex
任何帮助将不胜感激。