Python callback functions

def callbackFunc(s):

    print('Length of the text file is : ', s)

def printFileLength(path, callback):

    f = open(path, "r")

    length = len(f.read())

    f.close()

    callback(length)

if __name__ == '__main__':

    printFileLength("sample.txt", callbackFunc)

references:

 https://pythonexamples.org/python-callback-function/