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Python - Merge Two Lists Into a Dictionary

Which is the best way of merging the list 1, 2 or 3 ?

keys_list = ['A', 'B', 'C']
values_list = ['blue', 'red', 'bold']

#There are 3 ways to convert these two lists into a dictionary
#1- Using Python's zip, dict functionz
dict_method_1 = dict(zip(keys_list, values_list))

#2- Using the zip function with dictionary comprehensions
dict_method_2 = {key:value for key, value in zip(keys_list, values_list)}

#3- Using the zip function with a loop
items_tuples = zip(keys_list, values_list) 
dict_method_3 = {} 
for key, value in items_tuples: 
    if key in dict_method_3: 
        pass # To avoid repeating keys.
    else: 
        dict_method_3[key] = value

I was wondering why this isn't working $\sqrt{2/8} \ne 22 $

When $a \ne 0$, there are two solutions to $(ax^2 + bx + c = 0)$

and they are

$$x = {-b \pm \sqrt{b^2-4ac} \over 2a}$$

  				
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3 is the best method for sure

  				
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$ax^2 + bx + c = 0$

  				
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