how to Check if value already exists or not within list of dictionaries? 

Example;
a = [{ 'main_color': 'red', 'second_color':'blue'},
     { 'main_color': 'yellow', 'second_color':'green'},
     { 'main_color': 'yellow', 'second_color':'blue'}]
if any(d.get('main_color') == 'red' for d in a):


//if value is exit returns true


else:


//false

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