String basics
what is the purpose of the function len()?
The function len(), which stands for length(variable), is meant to find the number of characters in a variable.
For example:
hollowing = '31/October'
print(len(hollowing)) output: 10
The term used to describe where an element is in a list
What is index?
The syntax float() is used with this type of data
What are floating point (decimal) numbers?
Are dictionary mutable?
Yes. You can change the content of the key and variable.
This is what happens to duplicate elements when put into a set
What is that the duplicates are removed?
What function formatting is used to find a character from a variable by knowing its index number?
Hint: it is the opposite of len()
print(variable[index])
For example:
hollowing = '31/October'
print(hollowing[0:2]) output: 31
* 0:2 = [0,2)
This is the main difference between a tuple and a list
What is that it is not able to be modified?
True or false: A list can contain both strings and integers
What is true?
prices = {'apples': 1.99, 'oranges': 1.49}
print(f"The price of apples is {prices['kiwi']}")
what is the output?
Traceback (most recent call last): File "main.py", line 3, in <module> print(f"The price of apples is {prices['kiwi']}") ~~~~~~^^^^^^^^ KeyError: 'kiwi'
If it doesn't exist, then you can't use it.
Tuples are created like lists except for this one difference
What is parenthesis instead of brackets?
how can you output a simple string with a variable?
print('string'/ Varble + 'string' / Varble)
for Example:
hollowing = '31/October'
print('what date is hollowing in 2024: ' + hollowing)
output: what date is hollowing in 2024: 31/October
The definition of a set
What is an unordered collection of unique elements?
The syntax to convert 1.23 into an integer, and the result of the expression
prices = {'apples': 1.99, 'oranges': 1.49}
del prices ['apples']
what is the output?
There is no output. we did not have a print statement.
print(prices)
output: {'oranges': 1.49}
This must be true about all the elements in a list when using max(list) or min(list)
What is that they all must be the same type?
what does the format string do? And how do you construct one?
The format string is the same as the + function. It allows you to add variables to strings in the same print statement.
For Example:
a = '5'
b = '6'
print(f'The sum of {a} and {b} is {a + b}.')
print('The sum of ' + a + ' and ' + b + ' is ' + a + b +'.')
a = 'abc'
b = 'def'
print(f'The sum of {a} and {b} is {a + b}.')
print('The sum of ' + a + ' and ' + b + ' is ' + a + b +'.')
This is what set1.difference(set2) does
What is that it returns all elements of set1 that are not in set2?
The meaning of the term "type" used in computer science
What is a classification of data that defines how data is stored, and what actions can be done to it?
what is the syntax of dictionary?
Hint: You have a variable that is assigned to key(s) and those key(s) are assigned to a value(element).
Varble = {key:value}
Letters = 'key' or 'value'
Numbers = NO quotes on key or values
For example:
jet = {'jet1':'f-35', 'jet2':'f-22',52: 35, 53:42,}
print(jet['jet1'],jet[52],jet['jet2'])
output: f-35 35 f-22
The proper code for creating a new set named common_brands that only contains the shared elements between two sets named car_brands and truck_brands
What is common_brands = car_brands.intersection(truck_brands)
or
What is common_brands = truck_brands.intersection(car_brands)
lists are mutable [you can modify them after they are created]. How can you construct a list using list methods?
Hint: remove() or pop() = removes an element from a variable
append() = add an element to a variable
variable = elements
print(Varble)
list method.variable(elements)
print(variable)
For example:
jet = ['f-12', 'f-22']
print(jet)
jet.append('t-99')
print(jet)
*Notice: [] = lists {} = sets
The proper syntax used to return the index of the first element in a list named list_of_numbers whos value matches variable user_num1
What is list_of_numbers.index(user_num1)?
10101101 converted from binary to a decimal number
What is 173?
How do you access a dictionary entry or a key value using f-string?
Hint: Dictionary entries cannot be accessed by indexing.
variable['key']
prices = {'apples': 1.99, 'oranges': 1.49}
print(f"The price of apples is {prices['apples']}")
output: The price of apples is 1.49
( ${prices['apples']}.:2f ) for $1.49
Use the given tuple to create a named tuple for a person named John who is 175 cm tall, has brown eyes, and black hair. Use an integer for height, and strings for eyecolor and haircolor.
Person = namedtuple('Person' ['height','eyecolor','haircolor'])
What is John = Person(175, 'brown', 'black')