A.if file. txt does not exist, it will be created

B.a newlina character translation will be performed during the reads

C.the opened file cannot be written with the use of the str variable

D.str is a string read in from the file named file.txt

A.an exception is raised

B.-1

C.1

D.0

A.it outputs True

B.it raises an exception

C.it outputs nothing

D.it outputs False

A.'deb' not in 'abcde' [::-1]

B.'True' not in 'False'

C.'phd' in 'alpha'

D.str(1-1) in '0123456739'[:2]

A.super-class constructor is invoked implicitly during constructor execution

B.the constructor can be invoked directly under strictly defined circumstances

C.the constructor cannot use the default values of the parameters

D.the constructor's first parameter identifies an object currently being created