class Main(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        QtWidgets.QWidget.__init__(self, parent)
        self.ui = Ui_Main()
        self.ui.setupUi(self)
        self.ui.btn_refresh.clicked.connect(self.refresh)

    def refresh(self):
        t = RefreshThread()
        t.start()
  

Dominoes fucked around with this message at 18:38 on Dec 9, 2013

• It makes explicit, early on, what kind of stuff we want.
  
• It helps me remember in two weeks what the hell I'm doing.
  
• I can raise more appropriate exceptions with better error messages.
  
• If it's a long running-process that may only occasionally use an attribute, I'd rather know right off the bat rather than at 2AM in three weeks.
  

if not x:
    return

try:
    #do something with x here
except TypeError:  # This error means x wasn't assigned a value in some_function.
    return

Dominoes fucked around with this message at 05:49 on Dec 10, 2013

ManoliIsFat fucked around with this message at 21:11 on Dec 12, 2013

Dominoes fucked around with this message at 01:23 on Dec 15, 2013

#Opening file myfile.hdf5
#This file has a group /Data
#A dataset /Data/mydataset
#And another dataset: /another_dataset
import h5py
#HDF5 upports similar file access flags as python's open() function:
#'w' for writing, 'r' for reading, etc
file = h5py.open("myfile.hdf5", 'r')
#HDF5 objects can be treated like dictionaries.  Here I've grabbed a dataset: 
mydataset = file['/Data/mydataset'] 
#Here I've grabbed a group (which is kind of like a folder in HDF5-speak):
mygroup = file['/Data/'] 
#This is a different way of grabbing mydataset, using a group object
mydataset_again = mygroup['mydataset'] 

#I want to do something with all datasets in the Data group
for ds in mygroup:
  #Do something

#Now I want to do something with all objects in the root of the file:
for obj in file:
  #Do something

QuarkJets fucked around with this message at 01:49 on Dec 15, 2013

sudo apt-get install --reinstall python-pip python3-pip
sudo pip install --upgrade virtualenvwrapper
source .bashrc # to reload virtualenvwrapper.sh

SurgicalOntologist fucked around with this message at 04:43 on Dec 15, 2013

Dominoes fucked around with this message at 16:35 on Dec 15, 2013

def oscillation_loop(gui):
...
    while True:
        ex.updatePbarSignal.emit(osc1.next())
        ... 
        time.sleep(0.01)


class Example(QtGui.QWidget):
    updatePbarSignal = QtCore.pyqtSignal(float)

    def __init__(self):
        super(Example, self).__init__()

        self.initUI()

    def initUI(self):

        ...
        self.pbar4 = QtGui.QProgressBar(self)
        self.pbar4.setGeometry(30, 10+90, 200, 25)

        self.updatePbarSignal.connect(lambda value: self.update_pbar(value))

        self.setGeometry(300, 300, 280, 170)
        self.setWindowTitle('ADC sliders')
        self.show()

    def update_pbar(self, value):
        self.pbar1.setValue(value)

• ex.updatePbarSignal.emit(osc1.next()) - use this in the place you'd normally update the widget with setValue() or w/e.
  
  
• updatePbarSignal = QtCore.pyqtSignal(float) - Boilerplate that has to include the data type of the signal. You can use Python or QT data tapes. I like putting it in the GUI's class, above the __init__ method.
  
  
• self.updatePbarSignal.connect(lambda value: self.update_pbar(value)) - Lambda's used here as a workaround; the connect command only likes a single line, and can't pass variables directly. Usually goes in the gui's __init__.
  
  
• def update_pbar(self, value):
  self.pbar1.setValue(value)
  - You can update with the GUI in this method without triggering errors.
  

Dominoes fucked around with this message at 14:59 on Dec 15, 2013