Deck 4: Strings and Text Files

Question 1

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

Answer 1

False

Question 2

All data output to or input from a text file must be strings.

Answer 2

True

Question 3

When used with strings, the left operand of Python's in operator is a target substring and the right operand is the string to be searched.

Answer 3

True

Question 4

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

Question 5

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

Question 6

A difference between functions and methods is that methods cannot return values.

Question 7

The string is a mutable data structure.

Question 8

A binary number is sometimes referred to as a string of bits or a bit string.

Question 9

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

Question 10

Using a text editor such as Notepad or TextEdit, you can create, view, and save data in a text file.

Question 11

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

Question 12

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

Question 13

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

Question 14

When using the open function to open a file for output (i.e., using 'w' as the mode string), if the file does not exist, Python raises an error.

Question 15

The string method isnumeric returns True if the string contains only digits or False otherwise.

Question 16

Some applications extract portions of strings called characters.

Question 17

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

Question 18

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

Question 19

In Python, all data values are objects.

Question 20

A Caesar cipher uses a plaintext character to compute two or more encrypted characters, and each encrypted character is computed using two or more plaintext characters.

Question 21

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

Question 22

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?

A) getline
B) readline
C) fetch
D) read

Question 23

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

Question 24

When using the open function to open a file for input (i.e., using 'r' as the mode string), if the file does not exist, Python raises an error.

Question 25

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

A) A mathematical structure known as an invertible matrix.
B) A random noise sampling from the computer's hardware.
C) A pseudorandom number generator defined by the encrypting language.
D) A hardware encryption chip designed to perform obfuscation.

Question 26

What is the value of the binary number 10010110 in base-10?

A) 144
B) 150
C) 169
D) 232

Question 27

What statement regarding the structure of strings is accurate?

A) A string is a sequence of zero or more characters.
B) A string's length as calculated by the len() function is always "1".
C) A string cannot be decomposed into more primitive parts.
D) A string is a mutable data structure.

Question 28

When a sender of information encrypts that information, what is the resulting text known as?

A) plain text
B) garbage text
C) cipher text
D) junk text

Question 29

You are running a Python script that is supposed to write data to an open file, but discover that the file contents are not updating even after the script finishes. What is most likely the issue?

A) The file was opened using 'w' instead of 'b' as the mode string.
B) The file is not being updated because it doesn't exist.
C) The file is not being written to using the dump() method.
D) The file was not closed using the close() method.

Question 30

A legacy program is outputting values in octal format, and you need to translate the octal to hexadecimal. What is 173 in octal expressed as a hexadecimal value?

A) FA
B) 7B
C) 5D
D) 9C

Question 31

The file method write expects a single string as an argument.

Question 32

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?

A) Alpha cipher
B) Caesar cipher
C) Jumble cipher
D) Alternate cipher

Question 33

What string method can you use to locate the lowest index in a string named s where substring "findme" is found?

A) s.locate("findme")
B) s.find("findme")
C) s.grep('findme')
D) s.search("findme")

Question 34

What happens if you attempt to access a string using an index equal to the string's length?

A) The entirety of the string will be accessed.
B) The name of the string will be accessed.
C) The string's location in memory will be returned.
D) An error will occur, indicating the index is out of range.

Question 35

You are parsing a comma separated value string with Python. What method can you use to separate the values in each line and place them in a list?

A) string.split(',')
B) string.delimit(',')
C) string.parsetolist(',')
D) string.strip(',')

Question 36

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?

A) filename[-3:]
B) filename[-3]
C) filename[:-3]
D) filename[$-3]

Question 37

After input is finished, another call to read returns an empty string to indicate that the end of the file has been reached.

Question 38

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

A) The file will be opened for random access.
B) The file will be opened for read access.
C) The file will be opened for write access.
D) The file will be opened in binary mode.

Question 39

What is the decimal number 98 in binary?

A) 110010‬
B) 1100011
C) 1100010‬
D) ‭1110010‬

Question 40

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

A) The base-9 numbering system.
B) The base-10 numbering system.
C) The Octal numbering system.
D) The hexadecimal numbering system.

Question 41

What os.path module function can you use to convert a path to a pathname appropriate for the current file system?

A) localize(path)
B) system(path)
C) convert(path)
D) normcase(path)

Question 42

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

A) os.stat
B) io.file
C) os.path
D) file.ops

Question 43

You are attempting to open a file containing a list of integer numbers, each on a separate line, and read them into Python as int types. What statement could you use to do this, assuming each line is represented by the line variable in a continuous loop?

A) num = int(line.strip())
B) num = line.strip()
C) num = line.strip(int(line))
D) num = line[:-1]

Question 44

Which of the following are examples of protocols that utilize encryption for data transfer? (Choose two.)

A) HTTP
B) HTTPS
C) FTPS
D) RCP

Question 45

What does the os module function remove do when called?

A) It removes a given file or directory that is passed to it.
B) It removes a given directory that is passed to it.
C) It removes a given file that is passed to it.
D) It removes a given symbolic link file and it's associated inode.

Question 46

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

A) 1
B) 2
C) 8
D) 16

Question 47

What os module function should you use to get the path of the current working directory?

A) getcwd()
B) cwd()
C) getpwd()
D) showcwd()

Question 48

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'.

Question 49

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

A) The root directory of the file system.
B) The current working directory.
C) The same folder as the Python executable file.
D) The user's home folder.

Question 50

What two methods can be used to return a copy of a string named s converted to all lowercase and all uppercase respectively?

A) s.lower()
B) s.lowcase()
C) s.upper()
D) s.upcase()