Practice Questions and Answers for Day 2 of Learning Python for Data Science

Test your Python skills with these 20 practice questions and solutions from Day 2 of Learning Python for Data Science. Covers string operations, data types, and more!

1. What will be the output of the following code?

x = "123"
y = int(x)
print(type(y))

Solution:

# Output: <class 'int'>

2. Extract the substring “learn” from the given string:

sentence = "Let's learn Python!"

Solution:

substring = sentence[6:11]
print(substring)  # Output: 'learn'

3. Convert the float 7.5 into an integer and print the result.

Solution:

num = 7.5
int_num = int(num)
print(int_num)  # Output: 7

4. Write a Python program to convert “Hello World” to uppercase.

Solution:

text = "Hello World"
print(text.upper())  # Output: 'HELLO WORLD'

5. What is the output of the following code?

x = "Data"
y = "Science"
print(x + y)

Solution:

# Output: 'DataScience'

6. Find the length of the string “Python Programming” using a built-in function.

Solution:

text = "Python Programming"
print(len(text))  # Output: 18

7. Write a Python code to extract “Science” from the string “Data Science”.

Solution:

text = "Data Science"
print(text[5:])  # Output: 'Science'

8. What will be the result of "Python"[::-1]?

Solution:

print("Python"[::-1])  # Output: 'nohtyP'

9. How can you check if a string starts with a specific letter? (Use an example)

Solution:

text = "Python Programming"
print(text.startswith("P"))  # Output: True

10. Replace all occurrences of “a” with “o” in the string “Data Analysis”.

Solution:

text = "Data Analysis"
print(text.replace("a", "o"))  # Output: 'Doto Anolysis'

11. Convert the string “PYTHON” to lowercase.

Solution:

text = "PYTHON"
print(text.lower())  # Output: 'python'

12. What will be the output of "Hello" * 3?

Solution:

print("Hello" * 3)  # Output: 'HelloHelloHello'

13. Extract the last 3 characters from the string “Data Science”.

Solution:

text = "Data Science"
print(text[-3:])  # Output: 'nce'

14. Given a string text = " Machine Learning ", write a Python command to remove leading and trailing spaces.

Solution:

text = "   Machine Learning   "
print(text.strip())  # Output: 'Machine Learning'

15. Convert the integer 2024 into a string.

Solution:

num = 2024
print(str(num))  # Output: '2024'

16. What function is used to determine the data type of a variable? Provide an example.

Solution:

num = 10
print(type(num))  # Output: <class 'int'>

17. Write a Python program to check whether a given string is empty or not.

Solution:

text = ""
print(len(text) == 0)  # Output: True

18. What is the output of print("5" + "5")?

Solution:

# Output: '55' (String concatenation, not addition)

19. Given a variable a = "Python", write a command to extract the first three characters.

Solution:

a = "Python"
print(a[:3])  # Output: 'Pyt'

20. What is the difference between .lower() and .casefold() in Python strings?

Solution: .lower() converts a string to lowercase but .casefold() is more aggressive as it is designed for case-insensitive string matching, handling special cases for certain languages.

Example:

text = "ß"
print(text.lower())    # Output: 'ß'
print(text.casefold()) # Output: 'ss'

Conclusion

These practice questions cover Python string manipulation, type conversions, and essential built-in functions. Practicing them will help solidify your understanding of these fundamental concepts.

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