python dictionary delete by value

dict.pop('key')

#optionally you can give value to return if key doesn't exist (default is None)
dict.pop('key', 'key not found')

myDict = {key:val for key, val in myDict.items() if val != deletevalue}

dict = {'an':30, 'example':18}
#1 Del
del dict['an']

#2 Pop (returns the value deleted, but can also be used alone)
#You can optionally set a default return value in case key is not found
dict.pop('example') #deletes example and returns 18
dict.pop('test', 'Key not found') #returns 'Key not found'