python错误之RuntimeError: dictionary changed size during iteration

pythonn报错信息：

C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\python.exe C:/Users/Administrator/PycharmProjects/pythondemo/maptest.pyTraceback (most recent call last):  File "C:/Users/Administrator/PycharmProjects/pythondemo/maptest.py", line 5, in <module>    for line in maps.keys():RuntimeError: dictionary changed size during iteration

# python2中实现遍历的同时删除字典中的元素；python3中运行报错信息："""C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\python.exe C:/Users/Administrator/PycharmProjects/pythondemo/maptest.pyTraceback (most recent call last):  File "C:/Users/Administrator/PycharmProjects/pythondemo/maptest.py", line 5, in <module>    for line in maps.keys():RuntimeError: dictionary changed size during iteration"""# maps = {1:"李明",2:"丹尼"}# for line in maps.keys():#     if(line == 2):#         maps.pop(line)# print(maps)

# python3中实现遍历的同时删除字典中的元素maps = {1:"李明",2:"丹尼"}for line in list(maps.keys()):    if(line == 2):        maps.pop(line)print(maps)