Threads and need to use the Excel API you should use schedule_call.įor example, you might use an Excel macro to start a long running task and when that task is complete Main thread in such a way that the Excel objects can be used safely. This is used to schedule a Python function to run on Excel’s In order to be able to work with multiple threads and still call back into Excel PyXLL has the Attempting to do so may result in serious problems and even cause Excel However, we have to be careful about how we call back into Excel from a background thread.Īs VBA has no ability to use threads the Excel objects are not written in a such a way that theyĬan be used across different threads. The standard Python threading module is a convenient way to run code on a background thread To perform a long running task you may want to run code on a background thread. In Python we have multi-threading support and sometimes In VBA everything always runs on Excel’s main thread. We do not advise this when calling your Python code fromĮxcel however, as it may return an Excel instance other than the one you You might try this using win32com directly rather than In that case the first open Excel instance found will be returned. Worksheet after Excel has finished calculating.įor testing, it can also be helpful to call into Excel from a Python prompt Schedule a call using schedule_call and have that call update the ![]() Worksheet cell values from a worksheet function, but it is possible to You can remove these restrictions by calling the PyXLL schedule_callįunction to schedule a Python function to be called in a way that lets you You can call into Excel using the Excel Object Model from macros and menuįunctions, and use a sub-set of the Excel functionality from worksheetįunctions, where more care must be taken because the functions are called # Note the parentheses which are not required in VBA but are in Python. Range ( 'B11:K11' ) # Call the 'Select' method on the Range. ![]() ActiveSheet # Call the 'Range' method on the Sheet xl_range = sheet. From pyxll import xl_macro, xl_app def macro1 (): xl = xl_app () # 'xl' is an instance of the Excel.Application object # Get the current ActiveSheet (same as in VBA) sheet = xl.
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