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Logic Gates in Python
  • Difficulty Level : Easy
  • Last Updated : 07 Dec, 2020

A Logic gate is an elementary building block of any digital circuits. It takes one or two inputs and produces output based on those inputs. Outputs may be high (1) or low (0). Logic gates are implemented using diodes or transistors. It can also be constructed using vacuum tubes, electromagnetic elements like optics, molecules, etc. In a computer, most of the electronic circuits are made up logic gates. Logic gates are used to create a circuit that performs calculations, data storage or shows off object-oriented programming especially the power of inheritance. 
There are seven basic logic gates defined, these are: AND gate, OR gate, NOT gate, NAND gate, NOR gate , XOR gate, and XNOR gate. 
1. AND Gate 
The AND gate gives an output of 1 if both the two inputs are 1, it gives 0 otherwise. 
 

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# Python3 program to illustrate
# working of AND gate
  
def AND (a, b):
  
    if a == 1 and b == 1:
        return True
    else:
        return False
  
# Driver code
if __name__=='__main__':
    print(AND(1, 1))
  
    print("+---------------+----------------+")
    print(" | AND Truth Table | Result |")
    print(" A = False, B = False | A AND B =",AND(False,False)," | ")
    print(" A = False, B = True | A AND B =",AND(False,True)," | ")
    print(" A = True, B = False | A AND B =",AND(True,False)," | ")
    print(" A = True, B = True | A AND B =",AND(True,True)," | ")

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Output: 
 

True
+---------------+----------------
 | AND Truth Table |    Result |
 A = False, B = False | A AND B = False  | 
 A = False, B = True  | A AND B = False  | 
 A = True, B = False  | A AND B = False  | 
 A = True, B = True   | A AND B = True   | 

2. NAND Gate 
The NAND gate (negated AND) gives an output of 0 if both inputs are 1, it gives 1 otherwise. 
 



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# Python3 program to illustrate
# working of NAND gate
  
def NAND (a, b):
    if a == 1 and b == 1:
        return False
    else:
        return True
  
# Driver code
if __name__=='__main__':
    print(NAND(1, 0))
  
    print("+---------------+----------------+")
    print(" | NAND Truth Table | Result |")
    print(" A = False, B = False | A AND B =",NAND(False,False)," | ")
    print(" A = False, B = True | A AND B =",NAND(False,True)," | ")
    print(" A = True, B = False | A AND B =",NAND(True,False)," | ")
    print(" A = True, B = True | A AND B =",NAND(True,True)," | ")

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Output: 
 

True
+---------------+----------------
 | NAND Truth Table |    Result |
 A = False, B = False | A AND B = True  | 
 A = False, B = True  | A AND B = True  | 
 A = True, B = False  | A AND B = True  | 
 A = True, B = True   | A AND B = False | 

  
3. OR Gate 
The OR gate gives an output of 1 if either of the two inputs are 1, it gives 0 otherwise. 
 

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# Python3 program to illustrate
# working of OR gate
  
def OR(a, b):
    if a == 1:
        return True
    elif b == 1:
        return True
    else:
        return False
  
# Driver code
if __name__=='__main__':
    print(OR(0, 0))
  
    print("+---------------+----------------+")
    print(" | OR Truth Table | Result |")
    print(" A = False, B = False | A OR B =",OR(False,False)," | ")
    print(" A = False, B = True | A OR B =",OR(False,True)," | ")
    print(" A = True, B = False | A OR B =",OR(True,False)," | ")
    print(" A = True, B = True | A OR B =",OR(True,True)," | ")

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Output: 
 

False
+---------------+----------------+
 | OR Truth Table |    Result |
 A = False, B = False | A OR B = False  | 
 A = False, B = True  | A OR B = True   | 
 A = True, B = False  | A OR B = True   | 
 A = True, B = True   | A OR B = True   | 

  
4. XOR Gate 
The XOR gate gives an output of 1 if either both inputs are different, it gives 0 if they are same. 
 

 

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# Python3 program to illustrate
# working of Xor gate
  
def XOR (a, b):
    if a != b:
        return 1
    else:
        return 0
  
# Driver code
if __name__=='__main__':
    print(XOR(5, 5))
  
    print("+---------------+----------------+")
    print(" | XOR Truth Table | Result |")
    print(" A = False, B = False | A XOR B =",XOR(False,False)," | ")
    print(" A = False, B = True | A XOR B =",XOR(False,True)," | ")
    print(" A = True, B = False | A XOR B =",XOR(True,False)," | ")
    print(" A = True, B = True | A XOR B =",XOR(True,True)," | ")

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Output: 
 



0
+---------------+----------------+
 | XOR Truth Table | Result |
 A = False, B = False | A XOR B = 0  | 
 A = False, B = True  | A XOR B = 1  | 
 A = True, B = False  | A XOR B = 1  | 
 A = True, B = True   | A XOR B = 0  | 

  
5. NOT Gate 
It acts as an inverter. It takes only one input. If the input is given as 1, it will invert the result as 0 and vice-versa. 
 

 

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# Python3 program to illustrate
# working of Not gate
  
def NOT(a):
    if(a == 0):
        return 1
    elif(a == 1):
        return 0
# Driver code
if __name__=='__main__':
    print(NOT(0))
  
    print("+---------------+----------------+")
    print(" | NOT Truth Table | Result |")
    print(" A = False | A NOT =",NOT(False)," | ")
    print(" A = True, | A NOT =",NOT(True)," | ")
   

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Output: 
 

1
+---------------+----------------+
 | NOT Truth Table | Result |
 A = False | A NOT = 1  | 
 A = True, | A NOT = 0  | 

  
6. NOR Gate 
The NOR gate (negated OR) gives an output of 1 if both inputs are 0, it gives 1 otherwise. 
 

 

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# Python3 program to illustrate
# working of NOR gate
  
def NOR(a, b):
    if(a == 0) and (b == 0):
        return 1
    elif(a == 0) and (b == 1):
        return 0
    elif(a == 1) and (b == 0):
        return 0
    elif(a == 1) and (b == 1):
        return 0
  
# Driver code 
if __name__=='__main__':
    print(NOR(0, 0))
  
    print("+---------------+----------------+")
    print(" | NOR Truth Table | Result |")
    print(" A = False, B = False | A NOR B =",NOR(False,False)," | ")
    print(" A = False, B = True | A NOR B =",NOR(False,True)," | ")
    print(" A = True, B = False | A NOR B =",NOR(True,False)," | ")
    print(" A = True, B = True | A NOR B =",NOR(True,True)," | ")

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Output: 
 

1
+---------------+----------------+
 | NOR Truth Table |   Result |
 A = False, B = False | A NOR B = 1  | 
 A = False, B = True  | A NOR B = 0  | 
 A = True, B = False  | A NOR B = 0  | 
 A = True, B = True   | A NOR B = 0  | 

  
7. XNOR Gate 
The XNOR gate (negated XOR) gives an output of 1 both inputs are same and 0 if both are different. 
 

 

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# Python3 program to illustrate
# working of Not gate
  
def XNOR(a,b):
    if(a == b):
        return 1
    else:
        return 0
# Driver code
if __name__=='__main__':
    print(XNOR(1,1))
  
    print("+---------------+----------------+")
    print(" | XNOR Truth Table | Result |")
    print(" A = False, B = False | A XNOR B =",XNOR(False,False)," | ")
    print(" A = False, B = True | A XNOR B =",XNOR(False,True)," | ")
    print(" A = True, B = False | A XNOR B =",XNOR(True,False)," | ")
    print(" A = True, B = True | A XNOR B =",XNOR(True,True)," | ")

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Output: 
 

1
+---------------+----------------+
 | XNOR Truth Table |  Result |
 A = False, B = False | A XNOR B = 1  | 
 A = False, B = True  | A XNOR B = 0  | 
 A = True, B = False  | A XNOR B = 0  | 
 A = True, B = True   | A XNOR B = 1  | 

 

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