Python for android

This project is based on the version 3.5.1 of python. I have made some changes to the source code The specific steps for compile are as follows:

1.Preparation

• cross compiler toolchain was exported by ndk.

• ubuntu15.10 x64.

• python library need lots of dynamic libraries. And these libraries under folder of Libraries. Before comile, put the header and library to path/to/toolchain/sysroot/usr/include and path/to/toolchain/sysroot/usr/lib.

2.Compile

We shoud compile the source code under pc and android, because we need the executables pgen and _freeze_importlib which compile under PC. Unfortunately, i modify some source code, so this project could not be compiled for PC.

• build pc.

  get the source code from https://www.python.org/downloads/release/python-351/, then build

  ./configure && make

  Or use the prebuilt executables, pgen and _freeze_importlib.

• cross compile

  ./configure  --build=x86_64-linux-gnu --host=arm-linux-androideabi --disable-ipv6 CONFIG_SITE=config.site --prefix=/system/

• Modify the Setup file under folder Modules to specify the modules should be compiled.

• Then you'll get errors，According to the errors, you may need to copy the executable pgen or _freeze_importlib which compile under PC to the right folder , and they under folder Parser or Programs. Do not forget to modifiy the time of each file.

  touch ./Parser/pgen 
  #Or
  touch ./Programs/_freeze_importlib

  The continue compiling.

• make install DESTDIR=/path/to/you/like

####3.Compiled

• Once compiled successfully，you can reduce the volume of executable use strip command. Like this:

  arm-linux-androideabi-strip python3.5

• Delete the static library if you don't need it.

• You can compress the standard library which under the directory of lib/python3.5 (use zip), and then put the compressed zip(python35.zip) file in the right place(may be under /system/lib/python3.5/). Or just put the zip to sdcard and export the PYTHONPATH when used. If you doesn't compress the library, put the library folder under /system/lib/. You shouldn't put the uncompressed library to sdcard because android doesn't support load shared library from sdcard. But you can push the compressed library to sdcard.

####4.Test

• if you use the library was compressed, you may need to set PYTHONPATH for python.

  

• supported modules

  

####5.Attention

This could use in adb shell, but not in an android app, I still working on it!