Session 3: Practicing with the tools
- Time: 2h
- Date: Wednesday, Feb-5th-2020
-
Goals:
- Practice by doing
- Practicing with Github
- Practicing with Pycharm
- Running programs
- Debugging programs
It is very important that you learn to use the tools: Github + pycharm. You should get confident with them. In this session you will have time to practice by your own. There are some proposes exercises for you to work
If you have not finished the exercises proposed in the previous sessions do it now, and when finished, continue with the exercises proposed in this session. It is very important that you try to do all the exercises
All these exercises should be stored in your working repo in the Session-03 folder. Do not forget to upload them to Github
- Filename: Session-03/debug_me.py. Create the python with this content:
# --- Find the error!
def g(a, b):
return a - b
def f(a, b, c, d):
t0 = a + b - g(a, 0)
t1 = g(c, d)
t3 = 2 * (t0 / t1)
return t0 + 2*t1 + t3*t3
# -- Main program
print("Result 1: ", f(5, 2, 5, 0))
print("Result 2: ", f(0, 2, 3, 3))
print("Result 3: ", f(1, 3, 2, 3))
print("Result 4: ", f(1, 9, 22.0, 3))- Execute the program. What happens?
- Execute it step by step. Could you find where is the problem!
- Filename: Session-03/dna_count.py
- Description: Create a program for counting the number of bases presented in a DNA sequence. The user introduces a sequence of letter representing the DNA chain. For example: CATGTAGACTAG. Our program should calculate the total length, and the number of bases that compound the sequence. In the previous example sequence, the output of our program should be like this:
Introduce the sequence: CATGTAGACTAG
Total length: 12
A: 4
C: 2
T: 3
G: 3
-
Considerations:
- You must use a loop for counting the bases
- Suppose that the user always introduce correct sequences (you do not have to manage any error yet)
- Filename: Session-03/dna_count_file.py
- Filename: Session-03/dna.txt. Text file with the DNA sequence. It can have sequences in separated lines. This is an example of the DNA text file:
AGTACACTGGT
ACCAGTGTACT
ATGGCCATTGTAATGGGCCGCTGAAAGGGTGCCCGATAG
- Description: Write a program that opens the dna.txt file and calculates the total number of bases, and the number of the different bases
-
Considerations:
- You must use a loop for counting the bases
- Suppose that the DNA files always contains correct sequences (you do not have to manage any error yet)
The session is finished. Make sure, during this week, that everything in this list is checked!
- You have all the items of the session 2 checked!
- Your working repo contains the Session-03 Folder with the following files:
- debug_me.py
- dna_count.py
- dna_count_file.py
- dna.txt
- Juan González-Gómez (Obijuan)
- Alvaro del Castillo. He designed and created the original content of this subject. Thanks a lot :-)
