python 如何對字典循環操作刪除並某一個元素

#--encoding:utf-8
#===============如何對字典循環操作刪除並某一個元素====================
d_demo = dict()
d_demo["name"] = "jim"
d_demo["age"]  = 25

'''
# 這樣直接循環字典，並對字典進行刪除元素操作，會拋出
# RuntimeError: dictionary changed size during iteration
for s_key in d_demo:
    if s_key=="name":
        d_demo.pop(s_key)
'''

#這樣才是正確的
for s_key in list(d_demo.keys()):
    if s_key == "name":
        d_demo.pop(s_key)
print(d_demo)
#{'age': 25}