python字典value查key

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key查value

dict ['key']

value查key

确保value值distinct

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#法1
def get_key1 (dict, value):
	return [k for k, v in dict.items() if v == value]
	
#法2
def get_key2 (dict, value):
	return list (dict.keys()) [list (dict.values()).index (value)]
	
#法3: 反转原字典，由原来的K-V存储形式，变为V-K存储形式

def get_key3 (dict, value):
	new_dict = {v : k for k, v in dict.items()}
	return new_dict[value]