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Exam 4: Strings and Text Files

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Question 1

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You are running a Python script that is supposed to write data to an open file, but discover that the file contents are being erased each time the script runs. What is most likely the issue?

A) The file was opened using a mode string other than 'a'.
B) The file is truncated by default with the write() method.
C) The file is erased when the script uses the close() method.
D) The file must be opened using a mode string of 'rw'.

E) None of the above
F) A) and B)

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Question 2

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The two digits in the base two number system are 0 and 1.

A) True
B) False

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Question 3

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In the binary number system, each digit or bit has a positional value that is a power of what?

What file access method can be used to read a single line of input and return the line as a string, including the newline character?

What specific Python module can you use to determine the file size in bytes of a given file?

Many applications now use data mangling to protect information transmitted on networks.

A data structure is a compound unit that consists of several smaller pieces of data.

The decimal number system is also called the base ten number system.

The encryption method that replaces a character in a text with another character some given distance away in the alphabet from the original is known as what type of cipher?

The remove file system function is included in the os.path module.

Data can be output to a text file using a(n) output object.

What does a block cipher utilize in order to change plaintext characters into two or more encrypted characters?

A method is always called with a given data value called an object, which is placed before the method name in the call.

What does a mode string of 'r' indicate when opening a file in Python?

A module behaves like a function, but has a slightly different syntax.

The absolute value of a digit is determined by raising the base of the system to the power specified by the position (baseposition).

When you launch Python, what file system path does it start with?

The decimal number system, which utilizes the numbers 0-9, is also known as what number system?

The string method isalphabetic returns True if the string contains only letters or False otherwise.

Your script is parsing filenames and is creating a count of how many files per file extension type exist within a directory. What slice could you use to extract the file extension substring, assuming the extensions are three letters only?