Embedding Python in Android

PyRun_SimpleString("import this");

...
I/pyjni   ( 9460): Traceback (most recent call last):
I/pyjni   ( 9460):   File "<string>", line 1, in <module>
I/pyjni   ( 9460): ImportError: No module named this

package com.example.pytest;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import android.app.Activity;
import android.util.Log;

import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.res.AssetManager;

/**
 * Handles the extraction of assets from an APK file.
 *
 * When the run() method is called, it compares the APK timestamp
 * with the timestamp in the extracted assets. If the APK is newer
 * (or there are no extracted assets), it extracts them to the
 * application's data folder and resets the extracted assets' timestamp.
 *
 * The APK is newer whenever there is a new installation or an update.
 *
 */
public class AssetExtractor {

    private final static String LOGTAG = "AssetExtractor";

    private Activity mActivity;
    private AssetManager mAssetManager;
    private static String mAssetModifiedPath = "lastmodified.txt";


    public AssetExtractor(Activity activity) {
        mActivity = activity;
        mAssetManager = mActivity.getAssets();
    }

    /* Returns the path to the data files */
    public String getDataFilesPath() {
        return mActivity.getApplicationInfo().dataDir + "/files/";
    }

    /* Sets the asset modification time  */
    private void setAssetLastModified(long time) {
        String filename = this.getDataFilesPath() + mAssetModifiedPath;
        try {
            BufferedWriter bwriter = new BufferedWriter(new FileWriter(new File(filename)));
            bwriter.write(String.format("%d", time));
            bwriter.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /* Returns the asset modification time  */
    private long getAssetLastModified() {
        String filename = this.getDataFilesPath() + mAssetModifiedPath;
        try {
            BufferedReader breader = new BufferedReader(new FileReader(new File(filename)));
            String contents = breader.readLine();
            breader.close();
            return Long.valueOf(contents).longValue();
        } catch (IOException e) {
            e.printStackTrace();
            return 0;
        }
    }

    /*
     * Returns the time of this app's last update
     * Considers new installs and updates
     */
    private long getAppLastUpdate() {
        PackageManager pm = mActivity.getPackageManager();
        try {
            PackageInfo pkgInfo = pm.getPackageInfo(mActivity.getPackageName(),
                    PackageManager.GET_PERMISSIONS);
            return pkgInfo.lastUpdateTime;
        } catch (Exception e) {
            e.printStackTrace();
            return 1;
        }
    }

    /* Recursively deletes the contents of a folder*/
    private void recursiveDelete(File file) {
        if (file.isDirectory()) {
            for (File f : file.listFiles())
                recursiveDelete(f);
        }
        Log.i(LOGTAG, "Removing " + file.getAbsolutePath());
        file.delete();
    }

    /**
     * Copy the asset at the specified path to this app's data directory. If the
     * asset is a directory, its contents are also copied.
     *
     * @param path
     * Path to asset, relative to app's assets directory.
     */
    private void copyAssets(String path) {
        // Ignore the following asset folders
        if (path.equals("images")
                || path.equals("sounds")
                || path.equals("webkit")
                || path.equals("databases") // Motorola
                || path.equals("kioskmode")) // Samsung
                    return;
        try {
            String[] assetList = mAssetManager.list(path);
            if (assetList == null || assetList.length == 0)
                throw new IOException();

            // Make the directory.
            File dir = new File(this.getDataFilesPath(), path);
            dir.mkdirs();

            // Recurse on the contents.
            for (String entry : assetList) {
                if (path == "")
                    copyAssets(entry);
                else
                    copyAssets(path + "/" + entry);
            }
        } catch (IOException e) {
            copyFileAsset(path);
        }
    }

    /**
     * Copy the asset file specified by path to app's data directory. Assumes
     * parent directories have already been created.
     *
     * @param path
     * Path to asset, relative to app's assets directory.
     */
    private void copyFileAsset(String path) {
        File file = new File(this.getDataFilesPath(), path);
        Log.i(LOGTAG, String.format("Extracting %s to %s", path, file.getAbsolutePath()));
        try {
            InputStream in = mAssetManager.open(path);
            OutputStream out = new FileOutputStream(file);
            byte[] buffer = new byte[1024];
            int read = in.read(buffer);
            while (read != -1) {
                out.write(buffer, 0, read);
                read = in.read(buffer);
            }
            out.close();
            in.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }


    public void run() {
        // Get the times of last modifications
        long appLastUpdate = this.getAppLastUpdate();
        long assetLastModified = this.getAssetLastModified();
        if (appLastUpdate > assetLastModified) {
            // Clear previous assets
            Log.i(LOGTAG, "Removing private assets");
            File file = new File(this.getDataFilesPath());
            this.recursiveDelete(file);
            file.mkdir();
            // Extract new assets
            Log.i(LOGTAG, "Extracting assets");
            this.copyAssets("");
            // Update extract asset's timestamp
            this.setAssetLastModified(appLastUpdate);
            Log.i(LOGTAG, "Done!");
        } else {
            // Extracted assets are up to date
            Log.i(LOGTAG, "Assets are up to date");
        }
    }
}

// Extract assets on first run/update
new AssetExtractor(this).run();

public static native int start(String datapath);

// Start Python interpreter, pass the data files location
PythonWrapper.start(getFilesDir().getAbsolutePath());

JNIEXPORT jint JNICALL Java_com_example_pytest_PythonWrapper_start
  (JNIEnv *env, jclass jc, jstring datapath)
{
    LOG("Initializing the Python interpreter");
    // Get the location of data files
    jboolean iscopy;
    const char *data_path = (*env)->GetStringUTFChars(env, datapath, &iscopy);
    // Set Python environment variables
    setenv("PYTHONHOME", data_path, 1);
    setenv("PYTHONPATH", data_path, 1);
    // Initialize Python interpreter and log
    Py_OptimizeFlag = 1; // Allow to run .pyo files outside zip (one of [0,1,2])
    Py_Initialize();
    init_androidembed();
    // Execute boot script
    PyRun_SimpleString("import boot");
    return 0;
}

import sys
# True as of https://docs.python.org/2/library/sys.html#sys.path
ANDROID_DATA_PATH = sys.path[0]

print "Booting Python embedded on Android.."
print "Android data location: ", ANDROID_DATA_PATH

# Add site-packages to search path
sys.path.append(ANDROID_DATA_PATH + "/lib/python2.7/site-packages")
print sys.path

# Import a standard library module
import this

I/pyjni   ( 3002): Booting Python embedded on Android..
I/pyjni   ( 3002): Android data location:  /data/data/com.example.pytest/files
I/pyjni   ( 3002): ['/data/data/com.example.pytest/files', '/data/data/com.example.pytest/files/lib/python27.zip', '/data/data/com.example.pytest/files/lib/python2.7/', '/data/data/com.example.pytest/files/lib/python2.7/plat-linux3', '/data/data/com.example.pytest/files/lib/python2.7/lib-tk', '/data/data/com.example.pytest/files/lib/python2.7/lib-old', '/data/data/com.example.pytest/files/lib/python2.7/lib-dynload', '/data/data/com.example.pytest/files/lib/python2.7/site-packages']
I/pyjni   ( 3002): The Zen of Python, by Tim Peters
I/pyjni   ( 3002): Beautiful is better than ugly.
I/pyjni   ( 3002): Explicit is better than implicit.
I/pyjni   ( 3002): Simple is better than complex.
I/pyjni   ( 3002): Complex is better than complicated.
I/pyjni   ( 3002): Flat is better than nested.
I/pyjni   ( 3002): Sparse is better than dense.
I/pyjni   ( 3002): Readability counts.
I/pyjni   ( 3002): Special cases aren't special enough to break the rules.
I/pyjni   ( 3002): Although practicality beats purity.
I/pyjni   ( 3002): Errors should never pass silently.
I/pyjni   ( 3002): Unless explicitly silenced.
I/pyjni   ( 3002): In the face of ambiguity, refuse the temptation to guess.
I/pyjni   ( 3002): There should be one-- and preferably only one --obvious way to do it.
I/pyjni   ( 3002): Although that way may not be obvious at first unless you're Dutch.
I/pyjni   ( 3002): Now is better than never.
I/pyjni   ( 3002): Although never is often better than *right* now.
I/pyjni   ( 3002): If the implementation is hard to explain, it's a bad idea.
I/pyjni   ( 3002): If the implementation is easy to explain, it may be a good idea.
I/pyjni   ( 3002): Namespaces are one honking great idea -- let's do more of those!