Bug#628484: python-xpcom: 'print' method from nsIWebBrowserPrint doesn't work because it triggers a syntax error

Sascha Silbe sascha-debian-bugs-foo at silbe.org
Sun May 29 12:55:12 UTC 2011

Package: python-xpcom
Version: 1:0.0~hg20100212-5+1
Severity: normal

When trying to access the 'print' method of the nsIWebBrowserPrint
interface, python-xpcom generates Python code on the fly and fails to
evaluate it because 'print' is a reserved keyword in Python:

(sugar-jhbuild1)sascha.silbe at twin:~$ ./print-bug.py
returning /tmp/prefs.js for key NS_APP_PREFS_50_FILE
GConf Error: Failed to contact configuration server; the most common cause is a missing or misconfigured D-Bus session bus daemon. See http://projects.gnome.org/gconf/ for information. (Details -  1: Server ping error: IDL:omg.org/CORBA/COMM_FAILURE:1.0)
Traceback (most recent call last):
  File "./print-bug.py", line 20, in _save_pdf
    getattr(print_iface, 'print')
  File "/usr/lib/pymodules/python2.6/xpcom/client/__init__.py", line 374, in __getattr__
    return getattr(interface, attr)
  File "/usr/lib/pymodules/python2.6/xpcom/client/__init__.py", line 466, in __getattr__
    unbound_method = BuildMethod(method_info, self._iid_)
  File "/usr/lib/pymodules/python2.6/xpcom/client/__init__.py", line 125, in BuildMethod
    codeObject = compile(method_code, "<XPCOMObject method '%s'>" % (name,), "exec")
  File "<XPCOMObject method 'print'>", line 2
    def print(self, Param1, Param2):
SyntaxError: invalid syntax

print-bug.py is attached.

In case anyone else gets stuck on the issue, here is how I worked around it:

            print_method = getattr(print_iface, 'print')
        except SyntaxError:
            # HACK: Run-time patch python-xpcom to work around a bug.
            # 'print' is a reserved keyword, so it must not occur in generated
            # code.
            iid = interfaces.nsIWebBrowserPrint
            internal_interface = print_iface.__dict__['_interfaces_'][iid]
            info = internal_interface.__dict__['_method_infos_']['print']
            info.name = 'print_'
            print_method = getattr(print_iface, 'print')

-- System Information:
Debian Release: 6.0.1
  APT prefers stable
  APT policy: (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.32-5-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages python-xpcom depends on:
ii  libc6                   2.11.2-10        Embedded GNU C Library: Shared lib
ii  libnspr4-0d             4.8.6-1          NetScape Portable Runtime Library
ii  libpython2.6            2.6.6-8+b1       Shared Python runtime library (ver
ii  libstdc++6              4.4.5-8          The GNU Standard C++ Library v3
ii  python                  2.6.6-3+squeeze6 interactive high-level object-orie
ii  python-support          1.0.10           automated rebuilding support for P
ii  xulrunner-1.9.2       XUL + XPCOM application runner

python-xpcom recommends no packages.

python-xpcom suggests no packages.

-- no debconf information
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