PCAP-31-03 3.3 Employ Built-In String Methods PCAP-31 Practice Questions (Page 8)

Questions 36–40

1. 36application · medium

   A data-cleaning script receives user input that may contain leading/trailing spaces and digits. You need to verify that after stripping, the remaining text consists only of letters (no digits, no spaces) before storing it. Which code snippet correctly performs this check?

   • Aif user_input.rstrip().isalnum():
   • Bif user_input.strip().isalpha():
   • Cif user_input.lstrip().isdigit():
   • Dif user_input.isalpha().strip():
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2. 37application · hard

   You have a list of IP addresses: ips = ['192.168.1.1', '10.0.0.1', '172.16.0.1']. You need to produce a single string with the IPs sorted by their last octet (the number after the last dot) and separated by a semicolon. Which code snippet achieves this?

   • Asorted(';'.join(ips), key=lambda ip: int(ip.split('.')[-1]))
   • B';'.join(sorted(ips))
   • C';'.join(ips.sort(key=lambda ip: int(ip.split('.')[-1])))
   • D';'.join(sorted(ips, key=lambda ip: int(ip.split('.')[-1])))
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4. 38application · hard

   A CSV line is: 'name,age,city'. You need to parse it into a list of fields, but you also need to handle the possibility that a field may contain a comma (e.g., 'Doe, John'). Which approach is most robust?

   • Aline.split(',')
   • BUse the csv module's reader, not string split()
   • Cline.split(',', maxsplit=2)
   • Dline.strip().split(',')
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5. 39application · medium

   You are processing a list of strings that may have leading/trailing whitespace and also may contain internal spaces. You need to remove only the leading/trailing whitespace, not the internal spaces, and then check if the resulting string is non-empty. Which code snippet does this?

   • Acleaned = s.strip(); if cleaned:
   • Bcleaned = s.replace(' ', ''); if cleaned:
   • Ccleaned = s.lstrip(); if cleaned:
   • Dcleaned = s.rstrip(); if cleaned:
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6. 40expert · hard

   You are writing a parser that must locate the position of the first '=' in a string, but you want to avoid raising an exception if '=' is not present. You also need to find the last '=' if there are multiple. Which combination of methods is most appropriate?

   • AUse index() for the first and rindex() for the last
   • BUse index() for the first and find() for the last
   • CUse find() for both, but with different start parameters
   • DUse find() for the first and rfind() for the last
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