26、while Circulation and for-in The cycle is the same , Both specify the number of cycles
answer : wrong
Test point analysis : Examine circular knowledge ,while It is recommended to use when the number of cycles is not clear ,for It is recommended to use when the cycle is the number of ranking times , So the mistake
27、 have access to “+” and “-" To connect and delete strings
answer : wrong
Test point analysis : Check the string operation , String has no subtraction operation , Only the addition operation ( Connection string ), So the mistake
28、 Different types of elements can be stored in the same list
answer : Yes
Test point analysis : Check the list , The elements in the list can be of different types , So it's right
2021 year 3 month Python Analy