python 如何对字典循环中删除某一个元素

#--encoding:utf-8
#===============如何对字典循环操作删除并某一个元素====================
d_demo = dict()
d_demo["name"] = "jim"
d_demo["age"]  = 25

'''
# 这样直接循环字典，并对字典进行删除元素操作，会抛出
# RuntimeError: dictionary changed size during iteration
for s_key in d_demo:
    if s_key=="name":
        d_demo.pop(s_key)
'''

#这样才是正确的
for s_key in list(d_demo.keys()):
    if s_key == "name":
        d_demo.pop(s_key)
print(d_demo)
#{'age': 25}