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test_list = [ 1, 6, 3, 5, 3, 4 ] 
  
print("Check if 4 exists in the list (using a loop): ") 
  
for i in test_list: 
    if(i == 4) : 
        print ("Exists") 
  
print("Check if 4 exists in the list (using the in keyword): ") 

if (4 in test_list): 
    print ("Exists")

Check if 4 exists in the list (using a loop): 
Exists
Check if 4 exists in the list (using the in keyword): 
Exists

# Initialize the list
test_list_set = [ 1, 6, 3, 5, 3, 4 ] 
test_list_bisect = [ 1, 6, 3, 5, 3, 4 ] 
  
print("Check if 4 exists in the list (using set() + in): ") 
  
test_list_set = set(test_list_set) 
if 4 in test_list_set : 
    print ("Exists") 
  
print("Check if 4 exists in the list (using count()): ") 
  
if test_list_bisect.count(4) > 0 :
    print ("Exists")

Check if 4 exists in the list (using set() + in): 
Exists
Check if 4 exists in the list (using count()): 
Exists