PCAP-31-03 3.2 Operate on Strings PCAP-31 Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   What does the ord() function return when passed a single-character string in Python?

   • AThe character itself
   • BThe ASCII value of the character as a string
   • CThe Unicode code point of the character as an integer
   • DThe binary representation of the character
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2. 17foundation · easy

   What is the result of the expression "ell" in "hello"?

   • AFalse
   • BNone
   • CAn error
   • DTrue
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4. 18application · medium

   A developer writes the following code to build a string of repeated greetings: ```python greeting = 'Hi' result = '' for i in range(3): result += greeting ``` What is the value of `result` after this loop, and why does this work?

   • A'HiHiHi' — because `+=` creates a new string and rebinds `result` to it.
   • BAn error — because you cannot use `+=` on a string.
   • C'HiHiHi' — because strings are mutable and `+=` modifies the existing string in place.
   • D'HiHiHi' — because `+=` is equivalent to `result.append(greeting)`.
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5. 19foundation · easy

   What happens when you execute the following code? s = "hello" s[0] = 'H'

   • AThe string s becomes "Hello".
   • BThe string s becomes "hello" with no change.
   • CA TypeError is raised.
   • DA new string is created and s is updated.
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6. 20application · medium

   A developer needs to find the position of the first digit in a string `s`. Which code snippet correctly accomplishes this?

   • Afor i, ch in enumerate(s): if ch.isdigit(): print(i) break
   • Bprint(s.index(ch) for ch in s if ch.isdigit())
   • Cfor ch in s: if ch.isdigit(): print(s.find(ch)) break
   • Dprint(s.index([ch for ch in s if ch.isdigit()][0]))
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