Test8

What will f.read() return after reaching EOF in a .txt file?

• Raises EOFError

• Returns empty string

• Returns None

• Loops to the beginning

What happens if you use f.write("data") on a file opened with "r" mode?

• Writes normally

• Truncates the file first

• Raises io.UnsupportedOperation

• Returns False

Which is true about with open(...) as f: block?

• It closes the file only on success

• File stays open after the block ends

• It guarantees file closure even on exceptions

• Cannot be used with binary files

What does f.readlines() return by default?

• A single string

• List of lines with trailing newline characters

• List of stripped strings

• Generator

What’s the result of calling f.write("abc\n", "def\n")?

• Writes both lines

• Writes only the first

• SyntaxError

• TypeError

In CSV, what is the purpose of newline="" in open()?

• Prevents empty columns

• Combines rows

• Prevents extra blank lines (Windows)

• Forces UTF-8

Which of the following uses keys to access values directly?

• csv.reader

• csv.writer

• csv.DictReader

• csv.reader with delimiter

If a CSV uses semicolon, how do you read it properly?

• csv.reader(f, separator=";")

• csv.reader(f, delim=";")

• csv.reader(f, delimiter=";")

• csv.reader(f).delimiter=";"

What happens if DictWriter is used without writeheader()?

• The first row will be missing

• Header is inferred from dict

• Error is thrown

• It writes column names automatically

What will this print?

• <class 'list'>

• <class 'dict'>

• <class '_csv.reader'>

• <class 'str'>