Python Essentials Flashcards
What are the six primitive values and types?
int, float, complex, bool, str, and NoneType
What is the int type? Give an example.
Integers (whole numbers). Example: x = 1
What is the float type? Give an example.
Floating-point numbers (decimals). Example: x = 1.0
What is the complex type? Give an example.
Numbers with real and imaginary parts. Example: x = 1 + 2j
What is the bool type? Give an example.
Boolean (True/False values). Example: x = True
What is the str type? Give an example.
Strings (characters/text). Example: x = ‘hello’
What is the NoneType type? Give an example.
Special object indicating nulls. Example: x = None
What do variables do? Give an example.
They name values. Example: greeting = ‘hey there’
What is floor division? Example: a // b
An operation for integers and floats that gives the quotient (removes fractional parts) of a and b in the example: a // b
Can you type an example of formatted I/O and formatted string literals?
print(‘{X} has type {T}’.format(X=x, T=type(x)))
print(f’{x} has type {type(x)}’)
What is a tuple?
A read-only (‘immutable’) fixed-length sequence of values
What is the immutable version of a set?
A frozen set! NOT a tuple.
Is it quicker to access a mutable or an immutable object?
Immutable
Does it ‘cost’ more compute to change a mutable object or immutable object?
Immutable, because it requires creating a copy
Can the values that print from a tuple change?
YES, because the binding is unchangeable but not that objects that they are bound to. For example, the tuple could contain the variable ‘x’ which can be modified.
Do values in lists need to be the same type?
No
