How to solve these coding challenges:
Write your solution in PyCharm or in your preferred Python IDE.
If your solution is not correct, then try to understand the error messages, watch the video again, rewrite the solution, and test it again. Repeat this step until you get the correct solution.
Save the solution in a file for future reference or recap.
Challenge #1
Create a Python script that removes all the elements of a list that are duplicates.
Do the challenge in a single line of code using sets.
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Challenge #2
Consider a list of words (strings). Write a Python script that generates a dictionary where the key is the word in the list and the value is its length.
Sample List: words = ['Python', 'Java', 'C++', 'Golang', 'Solidity', 'Bash']
Expected Result: {'Python': 6, 'Java': 4, 'C++': 3, 'Golang': 6, 'Solidity': 8, 'Bash': 4}
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Challenge #3
Considering the following dict, get a dict representation sorted by key.
d1 = {'x': 5, 'a': 3, 'c': 2, 'b': 0}
A dict representation means viewing or printing the dict.
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Challenge #4
Considering the following dict, get a dict representation sorted by value.
d1 = {'x': 5, 'a': 3, 'c': 2, 'b': 0}
A dict representation means viewing or printing the dict.
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Challenge #5
Let's generalize the last challenge and sort a dictionary by any field of its values if the value is a composite type (list, tuple, etc).
Example: Considering this dictionary print a sorted view of the dictionary by the second field of its values.
employees = {'John': ('London', 4000, 28), 'Maria': ('Zagreb', 3800, 40), 'Diana': ('NYC', 3500, 31)}The output should be: [('Diana', ('NYC', 3500, 31)), ('Maria', ('Zagreb', 3800, 40)), ('John', ('London', 4000, 28))]
P.S. Do it with a single line of code.
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Challenge #6
Consider this dictionary. Print a sorted view of the dictionary by the third field of its values, in reverse order.
employees = {'John': ('London', 4000, 28), 'Maria': ('Zagreb', 3800, 40), 'Diana': ('NYC', 3500, 31)}The output should be: [('Maria', ('Zagreb', 3800, 40)), ('Diana', ('NYC', 3500, 31)), ('John', ('London', 4000, 28))]
P.S. Do it with a single line of code.
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Challenge #7
Consider the dictionary called COUNTRY declared in this Python script.
The keys are the country codes and the values are the country names.
Print a sorted view of the dictionary, by the key (country code).
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Challenge #8
Consider the dictionary called COUNTRY declared in this Python script.
Find the country which has the longest name.
Use list comprehension if possible.
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Challenge #9
Consider the following two Python Lists that save information about company sales for the last 6 years:
years = [2015, 2016, 2017, 2018, 2019, 2020]
sales = [350000, 400000, 410000, 439000, 500000, 290000]
Create a new list that connects the year to the corresponding sales.
The resulting list should be: [(2015, 350000), (2016, 400000), (2017, 410000), (2018, 439000), (2019, 500000), (2020, 290000)]
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Challenge #10
Consider the following two Python Lists that save information about company sales for the last 6 years:
years = [2015, 2016, 2017, 2018, 2019, 2020]
sales = [350000, 400000, 410000, 439000, 500000, 290000]
Create a new dictionary that has the keys, the years, and the values, the sales.
The resulting dict should be: {2015: 350000, 2016: 400000, 2017: 410000, 2018: 439000, 2019: 500000, 2020: 290000}
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Challenge #11
Create a new dictionary called profit that stores the profit of the company, if the profit margin is 25% of the sales.
Use dictionary comprehension if possible.
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Challenge #12
Consider the following 2 Lists: names = ["Dan", "John", "Diana"] and phones = [11111, 2222, 3333].
Create a set that contains the elements of the 2 lists in pairs.
The resulting set should be: {('John', 2222), ('Diana', 3333), ('Dan', 11111)}
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Challenge #13
Consider the two Python lists. Write a Python Script to make a new list whose elements are the intersection of the two given lists. This means all elements of L1 that also belong to L2, but no other elements.
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Challenge #14
Write a Python script that validates an email address by writing "Valid email!" or "Invalid email!".
If the email is not valid the script should display why it's not valid.
We consider a valid email address if:
it has at least 6 characters but no more than 16.
it contains both . and @
it does not contain any of the following characters:'[]{}()$*'
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