Test Questions
Previously, we conducted a hands-on teaching of single-cell + spatial transcriptomics using Python. To assess everyone’s learning outcomes, we have provided the following exercises for you to check your understanding of R language.
Question 1: Variable Assignment and Types
Complete the following operations using Python code:
– 1. Assign the variable a to 5, assign the variable b to 2.0, and assign the variable c to “Biomamba”
– 2. Use code to determine the data type of each variable
– 3. Convert variable a to a string type
Question 2: Basic Arithmetic Operations
– 1. What is the remainder of 10 divided by 3?
– 2. What is 2 raised to the power of 4?
– 3. What is the integer division of 11 by 4?
Calculate the above problems using Python code
Question 3: List Indexing and Modification
– 1. Given the list my_list = [‘A’, ‘B’, ‘C’, ‘D’, ‘E’], return the element at index 4 of the list.
– 2. Modify the element at index 1 of the list to ‘X’, and add a new element ‘F’ at the end of the list, then return the length of the modified list.
Complete the above tasks using Python code.
Question 4: List Slicing
– 1. Given the list numbers = [10, 20, 30, 40, 50, 60], extract the sublist from index 2 to 4 (including index 2 but excluding index 5).
– 2. Extract the first 3 elements of the list
– 3. Extract the last two elements of the list
Question 5: if Conditional Logic
Write an if loop statement: Given an input temperature, if it is greater than 25°, classify it as hot, if between 10-25° classify it as comfortable, otherwise classify it as cold
Question 6: for Loop to Traverse a String
Using a for loop, for a given string word = “Biomamba”, count the occurrences of the letter m in the string
Question 7: Function Calls and Default Parameters
Write a multiplication function that takes inputs a and b, and outputs the result when a=2 and b=5
Question 8: Function Parameters and Scope
Please define a function namedupdate_val that accepts a numeric variable and adds 5 to the original value, ultimately returning a variable named new_val
Question 9: Dictionary Access and Modification
Given the dictionary student = {‘name’: ‘Alice’, ‘age’: 20, ‘city’: ‘NY’}
– 1. Change the age to 21
– 2. Add a new key-value pair ‘major’: ‘CS’
– 3. Use the get method to retrieve the city information and store it in the variable result1
– 4. Check if the key ‘age’ exists in the dictionary, and store the result in the variable result2
student = {'name': 'Alice', 'age': 20, 'city': 'NY'}Question 10: Traversing Dictionary Key-Value Pairs
Given the dictionary data = {‘a’: 1, ‘b’: 2, ‘c’: 3}
What is the sum of all the keys and values in data?
data = {'a': 1, 'b': 2, 'c': 3}
Answers
Python
More Python Basics:
Bioinformatics Python Quick Reference Manual
Python Tool: Jupyter NotebookPython Tool: Spyder | Installation, Connection, and UsagePython’s “Rstudio” — PycharmBioinformatics Python Practice:
Single-cell + Spatial Transcriptomics, Full Process Hands-on Teaching!
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