PCAP-31-03 5.5 Perform Input/output Operations PCAP-31 Practice Questions (Page 3)

Questions 11–15

1. 11foundation · easy

   Which method is used to write a string to a file opened in text mode?

   • Aprint()
   • Boutput()
   • Cappend()
   • Dwrite()
   Reveal Solution Discussion Select an answer first
2. 12foundation · easy

   Which errno constant represents the error condition 'No such file or directory'?

   • Aerrno.EIO
   • Berrno.ENOENT
   • Cerrno.EACCES
   • Derrno.EEXIST
   Reveal Solution Discussion Select an answer first
4. 13foundation · easy

   What does the .read() method return when called with no arguments on a text file?

   • AThe entire content of the file as a string
   • BThe number of characters in the file
   • CA list of lines
   • DThe first line of the file
   Reveal Solution Discussion Select an answer first
5. 14foundation · easy

   Which mode string passed to the open() function opens a file for writing only, creating the file if it does not exist and truncating it to zero length if it does exist?

   • A'x'
   • B'w'
   • C'r+'
   • D'a'
   Reveal Solution Discussion Select an answer first
6. 15application · medium

   A developer is processing a large CSV file and must read it one line at a time to minimize memory usage. The file may contain very long lines. Which approach is most memory-efficient?

   • Adata = f.read(); for line in data.split('\n'): process(line)
   • Bfor line in f: process(line)
   • Clines = f.readlines(); for line in lines: process(line)
   • Dwhile True: line = f.readline(1024); if not line: break; process(line)
   Reveal Solution Discussion Select an answer first