removing subset dict within list

this unequivocally wholly easy explain an example, mislay intersection list within dict i wholly something this:

a = {1:'', 2:'', 3:'', 4:''}
exclusion = [3, 4, 5]

# have build adult new list iteration breaks
toremove = []
for var a.iterkeys():
    var exclusion:
        toremove.append(var)

for var toremove:
    del a[var]

this competence seem an surprising example, nonetheless it's extraordinary array times i've something this. doing sets many nicer, nonetheless i clearly wish keep 'values' dict.

this slight irritating since requires twin loops an additional array. there cleaner some-more fit proceed doing this.