File Processing - Set 3

1. Which is the function to read the remaining lines of the file from a file object infile ?
   1. infile.read(2)
   2. infile.read()
   3. infile.readlines()
   Show Answer

   Answer : B
   Explain : infile.read() - reads the remaing line of file.
2. Which function is used to read all the characters?
   1. readall()
   2. read()
   3. readcharacters()
   4. readchar()
   Show Answer

   Answer : B
   Explain : read() is used to read the entire document.
3. A function used for writing data in the binary format :
   1. write
   2. output
   3. send
   4. dump
   Show Answer

   Answer : D
   Explain : dump is used to write in binary file where as load is use to display binary file.
4. Which of the following is an invalid mode ?
   1. a
   2. ar+
   3. r+
   4. w
   Show Answer

   Answer : B
   Explain : a mode - open an existing file for append operation, r+ - open the file reading and writing the pointer at begin, and w - write the file.
5. Ravi opened a file in python using open( ) function but forgot to specify the mode. In which mode the file will open ?
   1. write
   2. append
   3. read
   4. Both read and write
   Show Answer

   Answer : C
   Explain : The default file access mode is read mode.
6. Fill in the blank.
   Import pickle
   f=open(“data.dat”, „rb‟)
   d=_____________.load(f)
   f.close()
   1. unpickle
   2. pickling
   3. pickle
   4. pick
   Show Answer

   Answer : C
   Explain : pickle mdodule is used to store data in binary file
7. Which statement will move file pointer 10 bytes backward from current position ?
   1. f.seek(-10,0)
   2. f.seek(-10,1)
   3. f.seek(10,0)
   4. None of the above
   Show Answer

   Answer : B
   Explain : In this f.seek(-10,1) f is file name , -10 mean backward 10 bytes and 1 is use for current position
8. In f.seek(offset, whence), A whence value of 0 means :
   1. from the beginning of the file.
   2. current file position
   3. the end of the file as the reference point
   4. None of these
   Show Answer

   Answer : A
   Explain : Whence value 0 means - starting point , 1 values means current position of cursor and 2 means the end of file.
9. Which statement will return one line from a file (file object is „f‟) ?
   1. f.readlines()
   2. f.readline()
   3. f.read()
   4. f.line()
   Show Answer

   Answer :readline read only one line of a file. B
   Explain :
10. Which mode creates a new file if the file does not exist ?
    1. write mode
    2. append mode
    3. both (A) & (B)
    4. none of the above
    Show Answer

    Answer : C
    Explain : If a file does not exist, append mode and write creates the file. The key difference between write and append modes is that append does not clear a file's contents.
11. Which function opens file in python ?
    1. open()
    2. Open()
    3. new()
    4. None of the above
    Show Answer

    Answer :A
    Explain : open() function opens a file, and returns it as a file object.
12. Which statement will read 5 characters from a file(file object „f‟) ?
    1. f.read()
    2. f.read(5)
    3. f.reads(5)
    4. None of above
    Show Answer

    Answer : B
    Explain : read(5) is use to read only 5 characters.
13. To read all contents from file object FILE at once we may use
    1. FILE.read(*)
    2. FILE.readlines()
    3. FILE.read()
    4. D.FILE.read()
    Show Answer

    Answer : C
    Explain : read() method is used to read file at once.
14. readlines () will return
    1. list of characteras
    2. list of strings
    3. list of lines
    4. list of tuple
    Show Answer

    Answer : B