用brew install 3.4.4（python）时报
zipimport.ZipImportError: can't decompress data; zlib not available
的错误，采用以下两步解决。
1、macdeMacBook-Pro:~ mac$ xcode-select --install
xcode-select: error: command line tools are already installed, use "Software Update" to install updates
2、macdeMacBook-Pro:~ mac$ brew install zlib
Caveats
This formula is keg-only, which means it was not symlinked into /usr/local.
OS X already provides this software and installing another version in
parallel can cause all kinds of trouble.
Generally there are no consequences of this for you. If you build your
own software and it requires this formula, you'll need to add to your
build variables:
LDFLAGS: -L/usr/local/opt/zlib/lib
CPPFLAGS: -I/usr/local/opt/zlib/include