This content originally appeared on DEV Community and was authored by Aatmaj
Today we will do more questions related to dictionaries for a thorough revision. In the process, we also will learn a few methods related to dictionaries.
Summary of the week-
- Day 18 We learnt about dictionaries. We checked out one example which covered many inbuilt functions related to dictionaries.
- Day 19 We practiced a few questions on dictionaries and had quite a thorough practice of dictionaries in Python. We did programs to fuse two separate lists to a single dictionary, paired out even numbers and made fancy dictionaries using for loops.
- Day 20 We learnt about hashtables and how to create them using dictionaries. We tried out simple and chained hashtables and worked out information retrieval using them.
Sample question-Concatenate two dictionaries.
We will now fuse two dictionaries to create a new one using the update() method
a={1:10, 2:20}
b={3:30, 4:40}
c={}
for i in (a,b):
#for every element in dictionary a AND dictionary b,
c.update(i)
#update the dictionary to include these values.
print(c)
output-
{1: 10, 2: 20, 3: 30, 4: 40}
Conflict resolution- In case both the dictionaries have a same key, in that case the last value is held true by the update() method.
a={1:10, 2:20}
b={3:30, 4:40 , 2:60}
c={}
d={}
for i in (a,b):
c.update(i)
print(c)
for i in (b,a):
d.update(i)
print(d)
{1: 10, 2: 60, 3: 30, 4: 40}
{1: 10, 2: 20, 3: 30, 4: 40}
Editing keys.
I know what you all must be thinking. Keys are non-mutable right?
Yes. they are. but here is a cleaver trick
a = {
"a":1,
"b":2,
"c":3,
"e":4
}
# Replace 'e' by 'd'
a["d"] = a.pop("e")
print(a)
{'b': 2, 'a': 1, 'c': 3, 'd': 4}
Today there are no exercises from my side..?...But wait!? I am providing a reference link for taking on a dictionary quiz to clear all your concepts!?
Dictionary quiz by PYnative
The quiz contains 14 Questions. 14/14 is the target
Comment your progress below by pasting screenshot of your scores!?
✌️So friends that's all for now. ? Hope you all are having fun.? Please let me know in the comment section below ?. And don't forget to like the post if you did. ? I am open to any suggestions or doubts. ? Just post in the comments below or gmail me. ?
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Thank you all?
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Next day will begin from Tuesday?, Monday is reserved for.... MATLAB MONDAYS? Follow me for updates...
This content originally appeared on DEV Community and was authored by Aatmaj
Aatmaj | Sciencx (2021-07-24T12:04:07+00:00) Learning Python-Basic course: Day 21,Summary of the week and dictionary exercises.. Retrieved from https://www.scien.cx/2021/07/24/learning-python-basic-course-day-21summary-of-the-week-and-dictionary-exercises/
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