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Python Institute PCED - Certified Entry-Level Data Analyst with Python Sample Questions:

1. A program uses slicing on a string "Python". The expression s[1:4] is evaluated. Which substring will be returned?

A) tho
B) ytho
C) yth
D) ythn

2. A script attempts to divide two numbers using / and //. The values are 7 and 2. The developer wants to understand the difference between true division and floor division. What are the results respectively?

A) 3 and 4
B) 3.5 and 3
C) 4 and 3
D) 3 and 3.5

3. You are analyzing survey results from students about their favorite colors. The list colorsstores individual responses:

You want to:
- find the number of unique colors mentioned using NumPy, and
- determine how often each color was chosen using Counter.
Which code snippet correctly performs both tasks? Select the best answer.
from numpy import unique

A) from collections import Counter
unique_colors = Counter(colors)
color_counts = sum(np.unique(colors))
import numpy as np
B) from collections import Counter
unique_colors = np.unique(colors)
color_counts = Counter(set(colors))
import numpy as np
C) from collections import Counter
unique_colors = len(unique(colors))
color_counts = Counter(colors)
import numpy as np
D) from collections import Counter
unique_colors = len(set(colors))
color_counts = np.unique(colors)

4. The following chart shows how a student spends 24 hours in a day:

Which statements are most accurate? (Choose two.)

A) Sleep and school take up the majority of time in a day.
B) School and homework together take up half of the day's time.
C) Commuting is the second most time-consuming activity.
D) Leisure accounts for a moderate portion of the student's daily schedule, larger than commuting but smaller than the time spent at school.
E) More time is spent commuting than on leisure.
F) Leisure and meals combined equal the time spent at school.

5. You want to safely read the contents of a file named records.txtand store them in a list. Your requirements are:
- The file should be automatically closed after reading,
- The code should check whether the file exists before opening it, and
- It should handle missing file errors gracefully.
Which of the following is the most appropriate way to accomplish this task in Python? Select the best answer.

A)

B)

C)

D)

Solutions: