I need help with loop one function and creating variables

[don]

my code that is working
*****************************************************

names = ['xx','yy','cc']

for name in names:
    exec("%s_mar = []" % name)
    some code...
    else:
       pass

xx_var = countAll(xx_mar)
yy_var = countAll(yy_mar)
cc_var = countAll(cc_mar)

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I need help with loop one function and creating variables - code below doesn't work

for name in names:
    eval("%s_var)" % name) = countAll('{0}_mar'.format(name))
    else:
       pass