centos7 install python3.7 with problem and how to fix it.

问题如下：

configure: error: no acceptable C compiler found in $PATH
缺少gcc
zipimport.ZipImportError: can’t decompress data
缺少zlib,zlib-devel

No module named '_ctypes'
3.7版本需要一个新的包libffi-devel

yum install libffi-devel -y  

解决如下：

yum install gcc zlib zlib-devel -y

yum install libffi-devel -y  

有关openssl的修复，python找不到ssl模块
安装模块
yum install openssl-devel -y
去掉注视
# Socket module helper for socket()
_socket socketmodule.c

# Socket module helper for SSL support; you must comment out the other
# socket line above, and possibly edit the SSL variable:
SSL=/usr/local/ssl
_ssl _ssl.c \
        -DUSE_SSL -I$(SSL)/include -I$(SSL)/include/openssl \
        -L$(SSL)/lib -lssl -lcrypto

有关zlib的修复
  到python安装目录下，运行./configure

  编辑Modules/Setup文件

　　　　vim Modules/Setup

　　　　找到下面这句，去掉注释

　　　　#zlib zlibmodule.c -I$(prefix)/include -L$(exec_prefix)/lib -lz

重新编译python3.
./configure --prefix=/usr/local/python3.
make && make install

建立软连接:

ln -s /usr/local/python3./bin/python3 /usr/bin/python3
ln -s /usr/local/python3./bin/pip3 /usr/bin/pip3

效果：

顺便安装了Ipython：

pip3 install ipython  #这里必须解决上面ssl模块的问题
ln -s /usr/local/python3.7/bin/ipython /usr/bin/ipython

因为缺少sqlite数据库模块，还有个报错：

/usr/local/python3./lib/python3./site-packages/IPython/core/history.py:: UserWarning: IPython History requires SQLite, your history will not be saved
  warn("IPython History requires SQLite, your history will not be saved")

解决方法：

yum install sqlite-devel -y
重新编译python3.7
这些坑相当头疼，所以提早把环境给装好

Ipython效果：