파이썬 객관식 심화 — SET 13 (긴 코드)

이름: ____________ 점수: _____ / 100 난이도: ★★★★★

다소 긴 프로그램입니다. 차분히 끝까지 추적하여 실행 결과를 고르세요. (문항당 10점, 범위: 1~8장 종합)

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1. (문자열 파싱)

raw = "12,34,56,78"
parts = raw.split(",")
total = 0
for p in parts:
    total += int(p)
print(total, len(parts))

① 180 4 ② 180 7 ③ 12345678 4 ④ 180 1 ⑤ Error

2. (조건·윤년)

def is_leap(y):
    if y % 400 == 0:
        return True
    if y % 100 == 0:
        return False
    if y % 4 == 0:
        return True
    return False

years = [2000, 1900, 2024, 2023]
count = 0
for y in years:
    if is_leap(y):
        count += 1
print(count)

① 1 ② 2 ③ 3 ④ 4 ⑤ Error

3. (while·이분 탐색)

secret = 42
low = 1
high = 100
guesses = 0
while low <= high:
    mid = (low + high) // 2
    guesses += 1
    if mid == secret:
        break
    elif mid < secret:
        low = mid + 1
    else:
        high = mid - 1
print(mid, guesses)

① 42 6 ② 42 7 ③ 42 50 ④ 50 7 ⑤ 42 8

4. (중첩 for·조건)

count = 0
n = 5
for i in range(1, n + 1):
    for j in range(1, n + 1):
        if i + j <= n:
            count += 1
print(count)

① 10 ② 15 ③ 6 ④ 25 ⑤ 20

5. (재귀·빠른 거듭제곱)

def power(base, exp):
    if exp == 0:
        return 1
    if exp % 2 == 0:
        half = power(base, exp // 2)
        return half * half
    return base * power(base, exp - 1)

print(power(2, 10))

① 512 ② 1024 ③ 100 ④ 20 ⑤ Error

6. (클래스·여러 메서드)

class Sensor:
    def __init__(self):
        self.readings = []
    def record(self, temp):
        self.readings.append(temp)
    def max_reading(self):
        return max(self.readings)
    def above(self, threshold):
        count = 0
        for r in self.readings:
            if r > threshold:
                count += 1
        return count

s = Sensor()
for t in [20, 25, 30, 22, 28]:
    s.record(t)
print(s.max_reading(), s.above(24))

① 30 3 ② 30 2 ③ 28 3 ④ 30 4 ⑤ Error

7. (예외·여러 종류) 다음 코드의 세 줄 출력으로 옳은 것은?

def safe_get(lst, idx, key):
    try:
        d = lst[idx]
        return d[key]
    except IndexError:
        return "no index"
    except KeyError:
        return "no key"

data = [{"a": 1}, {"b": 2}]
print(safe_get(data, 0, "a"))
print(safe_get(data, 5, "a"))
print(safe_get(data, 1, "a"))

① 1 / no index / no key ② 1 / no key / no index ③ no index / 1 / no key ④ 1 / no index / no index ⑤ Error

8. (모듈·표준편차)

import math

def std_dev(nums):
    mean = sum(nums) / len(nums)
    var = 0
    for n in nums:
        var += (n - mean) ** 2
    var = var / len(nums)
    return math.sqrt(var)

print(std_dev([2, 4, 4, 4, 5, 5, 7, 9]))

① 4.0 ② 2.0 ③ 2 ④ 1.41 ⑤ Error

9. (리스트·순서 보존 중복 제거)

nums = [3, 1, 3, 2, 1, 4, 2, 5]
seen = []
result = []
for n in nums:
    if n not in seen:
        seen.append(n)
        result.append(n)
print(result)

① [3, 1, 2, 4, 5] ② [1, 2, 3, 4, 5] ③ [3, 1, 3, 2, 1, 4, 2, 5] ④ [5, 4, 2, 1, 3] ⑤ [1, 3, 2, 4, 5]

10. (종합·장바구니)

prices = {"pen": 1000, "book": 5000, "bag": 20000}
cart = ["pen", "book", "pen", "bag", "pen"]
total = 0
counts = {}
for item in cart:
    total += prices[item]
    counts[item] = counts.get(item, 0) + 1

if total >= 25000:
    total = int(total * 0.9)
print(total, counts["pen"])

① 25200 3 ② 28000 3 ③ 25200 2 ④ 25200 5 ⑤ Error