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global vars are evil. avoid them, whenever possible (in your case, just pass them as additional parameters):

import cv2
import numpy as np



def accu_w(frame, avg1, avg2):

    if avg1 is None: avg1 = np.float32(frame)
    if avg2 is None: avg2 = np.float32(frame)

    cv2.accumulateWeighted(frame, avg1, 0.05)
    cv2.accumulateWeighted(frame, avg2, 0.0006)

    res1 = cv2.convertScaleAbs(avg1)
    res2 = cv2.convertScaleAbs(avg2)

    cv2.imshow('img',frame)
    cv2.imshow('avg1',res1)
    cv2.imshow('avg2',res2)



def main():

    c = cv2.VideoCapture(0)

    global avg1 = None
    global avg2 = None

    while(True):

        got_frame,frame = c.read()

        if got_frame:

            accu_w(frame, avg1, avg2)

            k = cv2.waitKey(20)
            if k == 27:
                break

    cv2.destroyAllWindows()
    c.release()

global vars are evil. avoid them, whenever possible (in your case, just pass them as additional parameters):

import cv2
import numpy as np



def accu_w(frame, avg1, avg2):

    if avg1 is None: avg1 = np.float32(frame)
    if avg2 is None: avg2 = np.float32(frame)

    cv2.accumulateWeighted(frame, avg1, 0.05)
    cv2.accumulateWeighted(frame, avg2, 0.0006)

    res1 = cv2.convertScaleAbs(avg1)
    res2 = cv2.convertScaleAbs(avg2)

    cv2.imshow('img',frame)
    cv2.imshow('avg1',res1)
    cv2.imshow('avg2',res2)



def main():

    c = cv2.VideoCapture(0)

    global avg1 = None
    global avg2 = None

    while(True):

        got_frame,frame = c.read()

        if got_frame:

            accu_w(frame, avg1, avg2)

            k = cv2.waitKey(20)
            if k == 27:
                break

    cv2.destroyAllWindows()
    c.release()