A callback is a function that's called from within another, ... return value * 1.7 ... Returning multiple values from a function (Perl, PHP, Python) - ... Recent in Python. Test Failed: unsupported operand type(s) for -: 'tuple' and 'list' 10 hours ago; Parse and restructure key:value pair of JSON Object to Python Object 12 hours ago; Hi , i have a dataset section1.csv and need to create the dataset with below columns [RegistrationNo, Name, Date1, Date2, Date3, …. DateN] 1 day ago
Returning a 0 value from the progress_callback causes gdal.RasterizeLayer to return immediately with a non-zero exit code. I've no idea on what the unknown parameter is for, however it is required for the callback to work.

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The return value of a call to Tk which generated recursive calls is printed on a separate line at the end of the recursion. For example: python executed: def callback(): button.configure(text = 'Bye') return 'Got me!' button = Tkinter.Button() button.configure(command = callback) button.invoke()
2 days ago · Add a callback to be run when the Task is done. This method should only be used in low-level callback-based code. See the documentation of Future.add_done_callback() for more details. remove_done_callback (callback) ¶ Remove callback from the callbacks list. This method should only be used in low-level callback-based code.

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This is a code i have written to get value from a user using GUI. Please guide me on how to get the user input from the call back function to the main function.
Thanks for your input.But what I want is to return the input value to a variable in the main program so that I can use t for other purpose. Actually my idea is to make one FTP GUI app so that user will provide input in GUI app & after the pressing Hit Me button the main program will be able to fetch the input details of user from this GUI.

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This is the code I have to circumvent the issue of not being able to "return" a value from a callback function. My goal would be to avoid using the class variable flag , which I use for this purpose only and is not very meaningful, and to "use" (or, incorrectely, "return") data.foo at the time needed, being when data.msg == 'stop' , outside of ...
For example, the simplex objective value would be requested using GRB.Callback.SPX_OBJVAL. If you would like to pass data to your callback function, you can do so through the Model object. For example, if your program includes the statement model._value = 1 before the optimization begins, then your callback function can query the value of model._value. Note that the name of the user data field must begin with an underscore.

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Note that PyAudio calls the callback function in a separate thread. The function has the following signature callback(<input_data>, <frame_count>, <time_info>, <status_flag>) and must return a tuple containing frame_count frames of audio data and a flag signifying whether there are more frames to play/record.
Returning a 0 value from the progress_callback causes gdal.RasterizeLayer to return immediately with a non-zero exit code. I've no idea on what the unknown parameter is for, however it is required for the callback to work.

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This recipe shows a simple way of implementing callbacks in Python. There are a few ways this can be done. The way shown here uses a simple function-based approach. In a nutshell, a callback can be informally described like this: function a calls function b, and wants to make b run a specific independent chunk of code at some point during b's ...
Recent in Python. Test Failed: unsupported operand type(s) for -: 'tuple' and 'list' 10 hours ago; Parse and restructure key:value pair of JSON Object to Python Object 12 hours ago; Hi , i have a dataset section1.csv and need to create the dataset with below columns [RegistrationNo, Name, Date1, Date2, Date3, …. DateN] 1 day ago

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CFFI: The C Foreign Function Interface for Python is used to access the C-API of the PortAudio library from within Python. It supports CPython 2.6, 2.7, 3.x; and is distributed with PyPy 2.0 beta2 or later.
The second callback sets an initial value when the options property changes: it sets it to the first value in that options array. The final callback displays the selected value of each component. If you change the value of the countries RadioItems component, Dash will wait until the value of the cities component is updated before calling the ...

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On Python 2, if this is set to True, unicode values are treated as text, and str and bytes values are treated as binary. This option has no effect on Python 3, where text and binary payloads are always automatically discovered. json – An alternative json module to use for encoding and decoding packets.
If you are trying to keep your script to a single line (for example, in a parameter expression or callback), you can use Python’s built-in __import__ function to return the module and immediately access its attributes:

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Return Values; Ansible Configuration Settings ... If you want to use Python API only for executing playbooks or modules, ... for host, result in results_callback ...
The glib.timeout_add() function sets a function (specified by callback) to be called at regular intervals (specified by interval, with the default priority, glib.PRIORITY_DEFAULT. Additional arguments to pass to callback can be specified after callback. The idle priority may be specified as a keyword-value pair with the keyword "priority".

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When calling into Python, R data types are automatically converted to their equivalent Python types. When values are returned from Python to R they are converted back to R types. Types are converted as follows: If a Python object of a custom class is returned then an R reference to that object is returned.
When extending Python, you may come across existing C functions that take a function callback. It makes sense to pass Python a function as the callback function. The trick is to have a C function callback call the Python function by suitably marshaling the arguments. This is done by stub_compare_func in the recipe.

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Im making this app that need to delay before call a function and get the return value. but because of time.sleep is freezing tkinter gui so i used tkinter.after. tkinter.after is working and diddnt frezee the window, but i cannot get a return value of a function that i've called. because after i delayed and get the returned value, i've to return it again to the other function that called this ...
def pythonFunction (rule_args, callback, rei): callback. writeLine ("stdout", "python rule called") Static python functions must be defined in core.py. There are three different types of functions, each with its own way of handling arguments and return values.

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CLI Option Callback and Context. In some occasions you might want to have some custom logic for a specific CLI parameter (for a CLI option or CLI argument) that is executed with the value received from the terminal. In those cases you can use a CLI parameter callback function. Validate CLI parameters¶
Execute user_callback when calibration of magnetometer is complete :param user_callback: :return: subscribe_pins (user_callback) ¶ Execute user_callback on input pin being changed on micro:bit :param user_callback: :return: subscribe_uart (user_callback) ¶ Execute user_callback on data being received on UART service

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For example, the simplex objective value would be requested using GRB.Callback.SPX_OBJVAL. If you would like to pass data to your callback function, you can do so through the Model object. For example, if your program includes the statement model._value = 1 before the optimization begins, then your callback function can query the value of model._value. Note that the name of the user data field must begin with an underscore.
When extending Python, you may come across existing C functions that take a function callback. It makes sense to pass Python a function as the callback function. The trick is to have a C function callback call the Python function by suitably marshaling the arguments. This is done by stub_compare_func in the recipe.

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Eel supports two ways of retrieving return values from the other side of the app, which helps keep the code concise. To prevent hanging forever on the Python side, a timeout has been put in place for trying to retrieve values from the JavaScript side, which defaults to 10000 milliseconds (10 seconds).

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