I have a function open_data that opens a file dialog for me to select a specific file. I want to access the selected file in another function run_data within the same file. Below is a sample demonstration of my code. Any suggestions to the selected file in the run_data function are welcomed.

def open_data():
    dialog = filedialog.askopenfilename(initialdir=".\", title="Select A Data",
                                        filetypes=(("numpy files", "*.npy"),
                                        ("all files", "*.*")))

    for data in dialog:
         print(data, end="")

def run_data():
    ## I want to access the selected data from the above dialog in this function##
    return data

CodePudding user response：

askopenfilename() returns a file name not an open file, so you will need to open it in order to be able to access its contents. You also need to check because the value returned can be None if the user canceled the dialog without selecting anything.

Since you want to retrieve the data in a separate function, you will need to use a global variable to hold the data between function calls.

data = None  # Initialize global variable.

def open_data():
    global data

    filename = filedialog.askopenfilename(initialdir=".\", title="Select A Data",
                                          filetypes=(("numpy files", "*.npy"),
                                          ("all files", "*.*")))
    if not filename:
        data = None  # User didn't select a file.
    else:
        data = np.load(filename)

def run_data():
    return data