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pincode = input('enter your pincode')


if pincode.isdigit() and (len(pincode)==4 or len(pincode)==6):
    print(True)
else:
    print(False)
enter your pincode123456 True 
 
pincode = input('enter your pincode')


if pincode.isdigit() and (len(pincode) in (4,6)):
    print(True)
else:
    print(False)
"12".isdigit()
True
"123a".isdigit()
False