A.False lower

B.True lower

C.False upper

D.True upper

A.3

B.1

C.2

D.the code is erroneous

A.'key' in diet

B.diet.exists('key')

C.'key' in diet.keys()

D.diet['key'] != None

A.backups

B.temporary data

C.Python 4 source code

D.semi-compiled Python code

A.a code point is a point inside the code when execution stops immediately

B.UTF-8 is one of the ways of representing UNICODE code points.

C.ASCII is the name of a character coding standard

D.an escape sequence can be recognized by the # sign put in front of it.