format函数报错:ValueError: dictionary update sequence element #0 has length 1; 2 is required,str转dict

一个字典通过format（）函数转换后就会由dict变为str，

例如:

a = "156464654654"
b = "652683126541"
c = "{'username':'%s','password':'%s','Submit': 'dre'}"%(a,b)
# c = eval("{'username':'%s','password':'%s','Submit': 'dre'}"%(a,b))
print(type(c))    #(输出<class 'str'>)

　　

所以在用的时候需要再将str转为dict,这里用到的转换为eval(),

例如:

a = "156464654654"
b = "652683126541"
# c = "{'username':'%s','password':'%s','Submit': 'dre'}"%(a,b)
c = eval("{'username':'%s','password':'%s','Submit': 'dre'}"%(a,b))
print(type(c))    #(输出<class "dict">)

　　附上原链接:https://blog.csdn.net/weixin_40894428/article/details/80683137