ENGR 102 Exam
Tested Questions With Revised
Correct Detailed Answers
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When we are finished with a file, we need to close it. This ensures that the file is
left in a valid condition. - ANSWER
True
A with statement can be used to open a file, execute a blo...
When we are finished with a file, we need to close it. This ensures that the file is
left in a valid condition. - ANSWER True
A with statement can be used to open a file, execute a block of statements, and
automatically close the file when complete.
with <open command> as <fileID>: - ANSWER True
With <open command> as <fileID>:
The fileID variable can be used to refer to the file within the indented portion of
the code. - ANSWER True
Separate open and close commands are best for when you will have multiple files
open at once or for a long time. - ANSWER True
Separate open and close commands are best for when the open/close commands
are not nested:
e.g. Open 1 => Open 2 => Close 1 => Close 2 - ANSWER True
, Using the with...as formulation is better for ensuring that your file is always
closed correctly. - ANSWER True
Using the with...as formulation is better for clearly delineating which part of the
code is doing file operations (indented block of code). - ANSWER True
To write, we will use the write command:
<fileID>.write(<string to write>)
Where the fileID is the file identifier (variable name) for a file that was opened for
writing or appending. - ANSWER True
Write will write only a single string - ANSWER True
Write will write strings, floats, integers, etc. - ANSWER False
Write will put a carriage return/new line after writing - ANSWER False
When writing to a file, the mode of the file must be explicitly set in the open()
function call. - ANSWER True
The mode 'w' opens a file for writing. If the file is missing, then a new file is
created. Contents of any existing file are overwritten. - ANSWER True
Assume we have a text file open for reading and the variable myfile is the file
identifier.
,next_line = myfile.readline()
This line of code reads one line of the file at a time. - ANSWER True
We can use a version of the for loop to iterate through lines in the file.
for line in myfile:
#Do stuff with the string line - ANSWER True
<string variable> = <fileID>.read()
Will read the entire file into one single string - ANSWER True
Both of these will convert all the lines in the file into a list of strings. - ANSWER
True
The split method will convert a string into a list of strings, based on a separator
that is specified. - ANSWER True
The join() string method performs the inverse operation of split(). It joins a list of
strings together to create a single string. - ANSWER True
x = "".join(['1', '2', '3'])
The type of the variable x is integer. - ANSWER False
, The write command automatically adds a newline character at the end of your
line - ANSWER False
Which of the following is the correct way to open a file in Python? Choose all that
apply.
myfile.open("log_file.csv", 'a')
myfile = open("mygrades.txt", 'r+')
In Captain James T. Kirk's voice: Computer, open file "StarTrekIsAwesome.csv"
with open("datafile.dat", 'w') as myfile: - ANSWER myfile =
open("mygrades.txt", 'r+')
with open("datafile.dat", 'w') as myfile:
What is the correct way to read from a file with the file identifier myfile? Choose
all that apply.
if myfile: read()
data = list(myfile)
for data in myfile: # do stuff
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