PCAP-31-03 5.5 Perform Input/output Operations PCAP-31 Practice Questions (Page 1)

Questions 1–5

1. 1application · easy

   A script must load all lines from a configuration file into a list for random access. The file is small (a few KB). The developer wants the simplest, most readable approach. Which code accomplishes this?

   • Alines = list(f.readline())
   • Blines = f.read().split('\n')
   • Clines = [] for line in f: lines.append(line)
   • Dlines = f.readlines()
   Reveal Solution Discussion Select an answer first
2. 2foundation · easy

   What is the purpose of the optional sizehint argument in readlines(sizehint)?

   • AIt limits the number of lines returned
   • BIt specifies the maximum number of characters per line
   • CIt indicates the encoding of the file
   • DIt suggests the approximate total size in bytes to read
   Reveal Solution Discussion Select an answer first
4. 3foundation · easy

   What is a key characteristic of a bytearray that makes it useful as an I/O buffer?

   • AIt is immutable
   • BIt can be modified in place
   • CIt automatically decodes bytes to text
   • DIt can only store integers larger than 255
   Reveal Solution Discussion Select an answer first
5. 4application · easy

   A developer is writing a report generator that must confirm how many characters were successfully written to a text file. The write() method returns a value. How should the developer capture and use this return value?

   • Acount = len(f.write(report_text)); print(f'Wrote {count} characters')
   • Bf.write(report_text); count = f.tell(); print(f'Wrote {count} characters')
   • Cf.write(report_text); print('Wrote characters')
   • Dcount = f.write(report_text); print(f'Wrote {count} characters')
   Reveal Solution Discussion Select an answer first
6. 5foundation · easy

   What does the .readline() method return when it reaches the end of a file?

   • AAn empty string
   • BNone
   • CA newline character
   • DA StopIteration exception
   Reveal Solution Discussion Select an answer first