encryption - Python code returning error 'Object is not callable' -

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so, have started playing around encryption coding , have been trying create unique encryption key based time. code far :

from threading import timer pyclbr import function import hashlib, binascii, time  key1="" buffer1="" buffer2=""  class repeatedtimer(object):     def __init__(self, interval, function, *args, **kwargs):         self.timer=none         self.function=function         self.interval=interval         self.args=args         self.kwargs=kwargs         self.is_running=false         self.start()      def _run(self):         self.is_running=false         self.start()         self.function(*self.args,**self.kwargs)      def start(self):         if not self.is_running:             self.timer=timer(self.interval,self._run)             self.timer.start()             self.is_running=true      def stop(self):         self.timer.cancel()         self.is_running=false  def generatekeys():     global key1     global buffer1     global buffer2      t=int((time.time())/10)     t=hashlib.sha1(str(t).encode('utf-8'))     t=t.hexdigest()     t=t.encode('utf-8')     t=binascii.hexlify(t)     t=t.decode('utf-8')     t=t[0:11]     t=int(t)>>5     buffer2=buffer1     buffer1=key1     key1=str(t)  def printkeys():     print("keys : "+key1+" "+buffer1+" "+buffer2)  timerstart=repeatedtimer(10,generatekeys()) #generatekeys(); timerstart2=repeatedtimer(11,printkeys())

whenever run above code keep getting error:

exception in thread thread-49: traceback (most recent call last):   file "/library/frameworks/python.framework/versions/3.5/lib/python3.5/threading.py", line 923, in _bootstrap_inner     self.run()   file "/library/frameworks/python.framework/versions/3.5/lib/python3.5/threading.py", line 1189, in run     self.function(*self.args, **self.kwargs)   file "/users/kiro/documents/liclipse workspace/encryptionfinal/pkg/enc_keygen.py", line 22, in _run     self.function(*self.args,**self.kwargs) typeerror: 'str' object not callable  exception in thread thread-50: traceback (most recent call last):   file "/library/frameworks/python.framework/versions/3.5/lib/python3.5/threading.py", line 923, in _bootstrap_inner     self.run()   file "/library/frameworks/python.framework/versions/3.5/lib/python3.5/threading.py", line 1189, in run     self.function(*self.args, **self.kwargs)   file "/users/kiro/documents/liclipse workspace/encryptionfinal/pkg/enc_keygen.py", line 22, in _run     self.function(*self.args,**self.kwargs) typeerror: 'nonetype' object not callable

does have idea why? want generatekeys() function keep running every 10 seconds , printkeys() function tell me keys every 11 seconds (to check assigning keys correctly global variables).

this more experimentation in fixing code working.

with line

timerstart=repeatedtimer(10,generatekeys())

you handing on result of call generatekeys() __init__ method. want do, hand on function itself. must not call it:

timerstart = repeatedtimer(10, generatekeys)

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