>>> test1 = dict(key1="xx",key2="yy",key3="aa",key4="bb",key5="cc",key6="dd") >>> type(test1) <class 'dict'>
>>> len(test1) 6
>>> test2=["key3","key5"] >>> for i in test2: print(i,test1[i]) key3 aa key5 cc >>> test3 = {} >>> for i in test2: test3[i] = test1[i] >>> test3 {'key3': 'aa', 'key5': 'cc'} >>> j = 0
>>> test4 = {} >>> for i in test1.keys(): j = j + 1
if j % 2 == 0: test4[i] = test1[i] >>> test4 {'key2': 'yy', 'key4': 'bb', 'key6': 'dd'}