Develop Reference

Why I am getting error in the pyzbar module while using this library it in the QRCode scanning project?

ERROR IS :
Traceback (most recent call last):
File "P:\Prashant\Python\Attendance\lib\site-packages\pyzbar\zbar_library.py", line 58, in load
dependencies, libzbar = load_objects(Path(''))
File "P:\Prashant\Python\Attendance\lib\site-packages\pyzbar\zbar_library.py", line 50, in load_objects
deps = [
File "P:\Prashant\Python\Attendance\lib\site-packages\pyzbar\zbar_library.py", line 51, in <listcomp>
cdll.LoadLibrary(str(directory.joinpath(dep)))
File "C:\Users\kalep\AppData\Local\Programs\Python\Python39\lib\ctypes\__init__.py", line 452, in LoadLibrary
return self._dlltype(name)
File "C:\Users\kalep\AppData\Local\Programs\Python\Python39\lib\ctypes\__init__.py", line 374, in __init__
self._handle = _dlopen(self._name, mode)
FileNotFoundError: Could not find module 'libiconv.dll' (or one of its dependencies). Try using the full path with constructor syntax.
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "P:\Prashant\CPP Project Planning\Rooturaj CPP PRoject\Attendance\attend.py", line 3, in <module>
from pyzbar .pyzbar import decode
File "P:\Prashant\Python\Attendance\lib\site-packages\pyzbar\pyzbar.py", line 7, in <module>
from .wrapper import (
File "P:\Prashant\Python\Attendance\lib\site-packages\pyzbar\wrapper.py", line 151, in <module>
zbar_version = zbar_function(
File "P:\Prashant\Python\Attendance\lib\site-packages\pyzbar\wrapper.py", line 148, in zbar_function
return prototype((fname, load_libzbar()))
File "P:\Prashant\Python\Attendance\lib\site-packages\pyzbar\wrapper.py", line 127, in load_libzbar
libzbar, dependencies = zbar_library.load()
File "P:\Prashant\Python\Attendance\lib\site-packages\pyzbar\zbar_library.py", line 60, in load
dependencies, libzbar = load_objects(Path(__file__).parent)
File "P:\Prashant\Python\Attendance\lib\site-packages\pyzbar\zbar_library.py", line 54, in load_objects
libzbar = cdll.LoadLibrary(str(directory.joinpath(fname)))
File "C:\Users\kalep\AppData\Local\Programs\Python\Python39\lib\ctypes\__init__.py", line 452, in LoadLibrary
return self._dlltype(name)
File "C:\Users\kalep\AppData\Local\Programs\Python\Python39\lib\ctypes\__init__.py", line 374, in __init__
self._handle = _dlopen(self._name, mode)
FileNotFoundError: Could not find module 'P:\Prashant\Python\Attendance\lib\site-packages\pyzbar\libzbar-64.dll' (or one of its dependencies). Try using the full path with constructor syntax.
I am creating project on attendance system using QR Code scanning and I use Python to create it.
I used all needed libraries in the program
like, cv2, numpy, pybase64, pyzbar.
But I am getting this above Error in the Pyzbar.

I got solution for this issue. I was facing similar issue just installed Visual C++ 64 bit version on my computer and restarted. Choose between vcredist_x86.exe or vcredist_x64.exe based on your machine.
https://www.microsoft.com/en-us/download/confirmation.aspx?id=40784. Hope this solves your issue as well.

Getting weird error on running python in cmd then continue normally

When I run python on cmd I get this weird error:
Failed calling sys.__interactivehook__
Traceback (most recent call last):
File "C:\Users\Khaled\AppData\Local\Programs\Python\Python310\lib\site.py", line 446, in register_readline
import readline
File "C:\Users\Khaled\AppData\Local\Programs\Python\Python310\lib\site-packages\readline.py", line 34, in <module>
rl = Readline()
File "C:\Users\Khaled\AppData\Local\Programs\Python\Python310\lib\site-packages\pyreadline\rlmain.py", line 422, in __init__
BaseReadline.__init__(self)
File "C:\Users\Khaled\AppData\Local\Programs\Python\Python310\lib\site-packages\pyreadline\rlmain.py", line 62, in __init__
mode.init_editing_mode(None)
File "C:\Users\Khaled\AppData\Local\Programs\Python\Python310\lib\site-packages\pyreadline\modes\emacs.py", line 633, in init_editing_mode
self._bind_key('space', self.self_insert)
File "C:\Users\Khaled\AppData\Local\Programs\Python\Python310\lib\site-packages\pyreadline\modes\basemode.py", line 162, in _bind_key
if not callable(func):
File "C:\Users\Khaled\AppData\Local\Programs\Python\Python310\lib\site-packages\pyreadline\py3k_compat.py", line 8, in callable
return isinstance(x, collections.Callable)
AttributeError: module 'collections' has no attribute 'Callable'
But then I continue using python normally:
>>>
I did not find any effects of this problem python is running normally but I do not want it to appear and to know what does it do.

Python-Bitcoinlib - FileNotFoundError: Could not find module 'libeay32'

I suspect this is a bit of a newb question, but I'm trying to run the following code using IDLE Shell 3.9.1:
from bitcoin.rpc import RawProxy
p = RawProxy()
info = p.getblockchaininfo()
print(info['blocks'])
And I am getting the following error:
Traceback (most recent call last):
File "C:\Users\Zack\Documents\Python\Scripts\crypto1.py", line 1, in <module>
from bitcoin.rpc import RawProxy
File "C:\Users\Zack\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\site-packages\bitcoin\rpc.py", line 48, in <module>
from bitcoin.wallet import CBitcoinAddress, CBitcoinSecret
File "C:\Users\Zack\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\site-packages\bitcoin\wallet.py", line 33, in <module>
import bitcoin.core.key
File "C:\Users\Zack\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\site-packages\bitcoin\core\key.py", line 34, in <module>
_ssl = ctypes.cdll.LoadLibrary(ctypes.util.find_library('ssl') or 'libeay32')
File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.496.0_x64__qbz5n2kfra8p0\lib\ctypes\__init__.py", line 452, in LoadLibrary
return self._dlltype(name)
File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.496.0_x64__qbz5n2kfra8p0\lib\ctypes\__init__.py", line 374, in __init__
self._handle = _dlopen(self._name, mode)
FileNotFoundError: Could not find module 'libeay32' (or one of its dependencies). Try using the full path with constructor syntax.
Any thoughts on how to get beyond this? Thanks for your help!

Error for Next button in pywinauto using python

I have to currently install windows application, create a new database etc almost everyday when testing the Windows desktop software builds that I get.
To make this job easier, I've decided to use python with pywinauto to automate this process.
Currently I was just trying to write a sample script to automate just another application. Following is my code:
from pywinauto.application import Application
app = Application().start(r"E:\New\any-video-converter.exe -a -n -y -- arguments")
dlg=app['Setup - Any Video Converter Professional']
Now I wanted to click on the 'Next >' button on the setup so I added the following to my code:
app.dlg.Next.Click()
But I get the following error message:
Traceback (most recent call last): File
"C:\Python34\lib\site-packages\pywinauto\application.py", line 243, in
__resolve_control
criteria)
File "C:\Python34\lib\site-packages\pywinauto\timings.py", line 424, in
wait_until_passes
raise err pywinauto.timings.TimeoutError
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "<pyshell#3>", line 1, in
<module>
app.dlg.NextButton.ClickInput()
File "C:\Python34\lib\site-packages\pywinauto\application.py", line 349, in
__getattribute__
ctrls = self.__resolve_control(self.criteria)
File "C:\Python34\lib\site-packages\pywinauto\application.py", line 246, in
__resolve_control
raise e.original_exception
File "C:\Python34\lib\site-packages\pywinauto\timings.py", line 402, in
wait_until_passes
func_val = func(*args)
File "C:\Python34\lib\site-packages\pywinauto\application.py", line 188, in
__get_ctrl
dialog = self.backend.generic_wrapper_class(findwindows.find_element(**criteria[0]))
File "C:\Python34\lib\site-packages\pywinauto\findwindows.py", line
84, in find_element
elements = find_elements(**kwargs)
File "C:\Python34\lib\site-packages\pywinauto\findwindows.py", line 294, in
find_elements
elements = findbestmatch.find_best_control_matches(best_match, wrapped_elems)
File "C:\Python34\lib\site-packages\pywinauto\findbestmatch.py", line 534, in
find_best_control_matches
raise MatchError(items = name_control_map.keys(), tofind = search_text)
pywinauto.findbestmatch.MatchError: Could not find 'dlg' in 'dict_keys([])'
Here is the snippet of the UI of the installer: Sample installer UI
I can't understand what's going wrong here. Any help would be appreciated.

pylint PyQt4 error

I write a program :
from PyQt4.QtCore import *
from PyQt4.QtGui import *
def main():
app = QApplication([])
button = QPushButton("hello?")
button.show()
app.exec_()
if __name__=="__main__":
main()
the file name is t.py,
when I run:
pylint t.py
in ubuntu9.10, pyqt4,
I got this:
pylint t.py
No config file found, using default configuration
error while building astng for /home/halida/data/workspace/test/t.py
Traceback (most recent call last):
File "/usr/lib/pymodules/python2.6/logilab/astng/manager.py", line 126, in astng_from_file
astng = ASTNGBuilder(self).file_build(filepath, modname)
File "/usr/lib/pymodules/python2.6/logilab/astng/builder.py", line 118, in file_build
node = self.string_build(data, modname, path)
File "/usr/lib/pymodules/python2.6/logilab/astng/builder.py", line 128, in string_build
return self.ast_build(parse(data + '\n'), modname, path)
File "/usr/lib/pymodules/python2.6/logilab/astng/builder.py", line 147, in ast_build
self.rebuilder.walk(node)
File "/usr/lib/pymodules/python2.6/logilab/astng/rebuilder.py", line 89, in walk
self._walk(node)
File "/usr/lib/pymodules/python2.6/logilab/astng/rebuilder.py", line 109, in _walk
self._walk(child, node)
File "/usr/lib/pymodules/python2.6/logilab/astng/rebuilder.py", line 103, in _walk
handle_leave = node.accept(self)
File "/usr/lib/pymodules/python2.6/logilab/astng/nodes.py", line 159, in accept
return func(self)
File "/usr/lib/pymodules/python2.6/logilab/astng/rebuilder.py", line 188, in visit_from
imported = node.root().import_module(node.modname)
File "/usr/lib/pymodules/python2.6/logilab/astng/scoped_nodes.py", line 282, in import_module
return MANAGER.astng_from_module_name(self.relative_name(modname, level))
File "/usr/lib/pymodules/python2.6/logilab/astng/manager.py", line 172, in astng_from_module_name
return self.astng_from_module(module, modname)
File "/usr/lib/pymodules/python2.6/logilab/astng/manager.py", line 207, in astng_from_module
astng = ASTNGBuilder(self).module_build(module, modname)
File "/usr/lib/pymodules/python2.6/logilab/astng/builder.py", line 80, in module_build
node = self.inspect_build(module, modname=modname, path=path)
File "/usr/lib/pymodules/python2.6/logilab/astng/builder.py", line 95, in inspect_build
self.object_build(node, module)
File "/usr/lib/pymodules/python2.6/logilab/astng/builder.py", line 195, in object_build
self.object_build(class_node, member)
File "/usr/lib/pymodules/python2.6/logilab/astng/builder.py", line 198, in object_build
object_build_methoddescriptor(node, member)
File "/usr/lib/pymodules/python2.6/logilab/astng/raw_building.py", line 150, in object_build_methoddescriptor
func = build_function(member.__name__, doc=member.__doc__)
AttributeError: 'PyQt4.QtCore.pyqtSignal' object has no attribute '__name__'
************* Module t
F: 1: <class 'logilab.astng._exceptions.ASTNGBuildingException'>: Unable to load module t ('PyQt4.QtCore.pyqtSignal' object has no attribute '__name__')
Compilation exited abnormally with code 1 at Sat Dec 26 10:43:54
in windows XP, with pythonxy,
I only got a error message, why?

Looks like a bug in astng. They try to read the name of a function which does not publish it (native extension func). I'd report a bug to both astng and pyqt projects. The first one would be that they should handle a no-name situation better. The second one would be that every sane extension should publish at least the function names.

I would check if you're using the very latest astng, pylint, etc.