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Safari | Python Developer's Handbook -> Generating an Executable Python Bytecode





< BACKMake Note | BookmarkCONTINUE >
152015024128143245168232148039196038240039088173205162105045222218066183100094184026121

Generating an Executable Python Bytecode

When loading a module, the Python interpreter first tries to load a byte-compiled version of the module (a .pyc or .pyo bytecode file) from the system. If it doesn't find one, it automatically byte-compiles the module, and in case the permissions given to the user who is executing the command allow, a byte-compiled version of the module is saved in the disk for a later user. Note that it is a good idea to bytecompile all files before giving Python access to users who cannot save in that source directory. Otherwise, the interpreter has to byte-compile the module every time the module is loaded, which can slow down program startup considerably.

Even though a Python bytecode file can automatically be created when importing a module, you can manually create them whenever you need, as well. In order to explicitly byte-compile a source file (.py) to a .pyc (or .pyo) bytecode file, you just need to execute the following code:

					
import py_compile
pycompile.compile("anyfilename.py")

				

As you can see, the py_compile module provides a function called compile() that does all the jobs. The general syntax for this function is

					
compile(file [, cfile] [, dfile])

				

where,

file source filename
cfile target filename; defaults to source with c or o appended (c normally and o in optimizing mode, giving .pyc or .pyo)
dfile filename to store error messages (defaults to source)

The compileall module can be used either as a script or as a module. It uses the py_compile module to byte-compile all installed files (or all files in selected directories).

The following example compiles all files from the current directory:

					
import compileall.py
compileall.compile_dir(".", force=1)

				

You can also use this module as a script, passing arguments to it. The syntax for usage as a script is as follows:

					
python compileall [-l] [-f] [-d destdir] [directory ...]

				

where,

-l avoids recursing into directories
-f forces rebuild even if timestamps are up-to-date
-d destdir directory to store the error messages

The script reads the directories that are informed as arguments and compiles all the files that it finds there. If no directory arguments are given, the routine uses the sys.path variable.

Note that the current version doesn't recur down into subdirectories of a package. Another implementation detail is that it only recurs into the maximum number of 10 levels. (This number is hard coded in the module's code.) Also note that to generate both .pyc and .pyo files, you will need to run Python twiceonce without the -O flag and once with it.


Last updated on 1/30/2002
Python Developer's Handbook, © 2002 Sams Publishing

< BACKMake Note | BookmarkCONTINUE >

Index terms contained in this section

byetcode
     executable
            generating
compile() function 2nd
compileall module
executable bytecode
      generating
functions
      compile() 2nd
generating
      executable bytecode
modules
      compileall
      py_compile 2nd
      scripts as
py_compile module 2nd
scripts
      modules as
syntax
      compile() function 2nd
      modules as scripts
sys.path variable
variables
      sys.path

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Sorry!This guy is mysterious, its blog hasn't been opened, try another, please!
OK

Warm tip!

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