python-exercises1.md

These are during-workshop exercises that correspond to the first Python script file.

Calculator and Variables

Use Python to find the answer:

Save the answer to a variable called result. Display the value of result.

Increment the value of result by 5.

Test if result is greater than or equal to 10 (get a True or False value as output).

Strings

• Create variables firstname and lastname and give them the appropriate values for your name.
• Join the variables together with a space in-between and save that in a variable called fullname.
• print() your full name.
• Then print your full name converted to all upper case.
• How many letters are in your name?
• Bonus: Replace all of the lowercase vowels in your name with *.

Done with the above? Create a variable with the text of Margaret Atwood's poem "You Fit Into Me" with line breaks and empty lines included:

you fit into me
like a hook into an eye

a fish hook
an open eye

String Formatting

Create variables firstname and lastname (or you may still have them defined from above). Insert them into a sentence that will read "My name is firstname lastname" (with the values of the variables) using the string format() function.

Lists

Make a list with 3 of your favorite words. Referencing each word using its index, print the following sentence with each word inserted in turn: "One of my favorite words is ___." (Hint: remember how to concatenate or format strings?)

Replace the middle element of the list with a new word.

Use in to test if 'flamingo' is in your list.

Add two words to the end of your list, then print it out.

Challenge

Add two words to the beginning of your list, then print it out.

Now remove the words you added to your list, and print it out again. See https://stackoverflow.com/questions/11520492/difference-between-del-remove-and-pop-on-lists for options on removing values from a list.

String Indexing

Start with the variable sentence as defined below.

sentence = "The quick brown fox jumped over the lazy dog."

• Get the first 10 characters of sentence
• Get the substring of sentence corresponding to "dog"

Nested lists

You can have nested lists. Create a list that has two other lists as its elements. Save it in a variable called nested_list.

Print the first list from nested_list. Then print the second element of the first list.

Lists: Fixing Syntax Errors

Fix the errors in the code below.

2010data = [3, 5, 7, 9, 11]
print("The first 2010 data value is " + 2010data[0])

mycolors = ["red", "green", "blue", ["purple", "pink", "teal"]]
# make the sentence below make sense with values from mycolors above
print(mycolors[1] + " and "mycolors[3] + " mix to make " + mycolors[4]) 

my_list=["apples", "bananas", "pears]
print(mylist)
# add avocado to the list
my_list + "avocado"
print(my_list)

Dictionaries

Make a dictionary with keys being types of animals and values being their class (invertebrate, mammal, bird, amphibian, reptile, or fish). Stuck thinking of animals? Use: dog, cat, frog, snake, salamander.

Get the class of two of the animals you added. Get the class of 'flamingo' using get(), with a default value of 'unknown'.

Now, add a new animal to your dictionary.

Get all of the keys in the dictionary.

Challenge: Dictionary troubleshooting

Run the following code, which produces an error:

ages = {'Casey': 41, 'Henry': 4, 'Madison': 2, 'Caroline': 0, 'Brian': 36}
ages.keys()[0]

Google the last line of the error to find a solution. Ask for help if you need.

Challenge: Dictionary of dictionaries

Run the following code. Then write an expression to get the the age of patient 'a49283'.

patients = {'a38275': {'age': 42, 'admitted': '2019-01-03', 'test': False},
            'a49283': {'age': 45, 'admitted': '2019-02-01', 'test': True},
            'a92042': {'age': 34, 'admitted': '2019-01-10', 'test': True}}