A lab directory for experiments in progress.

1 files changed, 64 insertions, 0 deletions

diff --git a/lab/show_pyc.py b/lab/show_pyc.py
new file mode 100644
index 00000000..a0834e88
--- /dev/null
+++ b/lab/show_pyc.py
@@ -0,0 +1,64 @@
+import dis, marshal, struct, sys, time, types

+

+def show_pyc_file(fname):

+    f = open(fname, "rb")

+    magic = f.read(4)

+    moddate = f.read(4)

+    modtime = time.asctime(time.localtime(struct.unpack('L', moddate)[0]))

+    print "magic %s" % (magic.encode('hex'))

+    print "moddate %s (%s)" % (moddate.encode('hex'), modtime)

+    code = marshal.load(f)

+    show_code(code)

+

+def show_py_file(fname):

+    text = open(fname).read().replace('\r\n', '\n')

+    code = compile(text, fname, "exec")

+    show_code(code)

+

+def show_code(code, indent=''):

+    print "%scode" % indent

+    indent += '   '

+    print "%sargcount %d" % (indent, code.co_argcount)

+    print "%snlocals %d" % (indent, code.co_nlocals)

+    print "%sstacksize %d" % (indent, code.co_stacksize)

+    print "%sflags %04x" % (indent, code.co_flags)

+    show_hex("code", code.co_code, indent=indent)

+    dis.disassemble(code)

+    print "%sconsts" % indent

+    for const in code.co_consts:

+        if type(const) == types.CodeType:

+            show_code(const, indent+'   ')

+        else:

+            print "   %s%r" % (indent, const)

+    print "%snames %r" % (indent, code.co_names)

+    print "%svarnames %r" % (indent, code.co_varnames)

+    print "%sfreevars %r" % (indent, code.co_freevars)

+    print "%scellvars %r" % (indent, code.co_cellvars)

+    print "%sfilename %r" % (indent, code.co_filename)

+    print "%sname %r" % (indent, code.co_name)

+    print "%sfirstlineno %d" % (indent, code.co_firstlineno)

+    show_hex("lnotab", code.co_lnotab, indent=indent)

+    

+def show_hex(label, h, indent):

+    h = h.encode('hex')

+    if len(h) < 60:

+        print "%s%s %s" % (indent, label, h)

+    else:

+        print "%s%s" % (indent, label)

+        for i in range(0, len(h), 60):

+            print "%s   %s" % (indent, h[i:i+60])

+

+def show_file(fname):

+    if fname.endswith('pyc'):

+        show_pyc_file(fname)

+    elif fname.endswith('py'):

+        show_py_file(fname)

+    else:

+        print "Odd file:", fname

+        

+def main(args):

+    for a in args:

+        show_file(a)

+        

+if __name__ == '__main__':

+    main(sys.argv[1:])