Core Syntax Flashcards
7 cards from real Python practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Core Syntax flashcards as text
What is the output of `print(not not True)`?
Answer: True
Applying `not` twice negates the value twice, returning the original `True`.
Which of the following creates an empty dictionary in Python?
Answer: {}
An empty pair of curly braces `{}` creates an empty dictionary; `set()` must be used for an empty set.
What does `'hello'[1:4]` evaluate to?
Answer: 'ell'
Slice `[1:4]` extracts characters at indices 1, 2, and 3 (stop index is exclusive), yielding `'ell'`.
In Python, what does the `global` keyword do inside a function?
Answer: Allows modification of a variable defined in the global scope
The `global` keyword tells Python that a name refers to the global scope, allowing assignment to that global variable inside a function.
What is the result of `list(range(2, 10, 3))`?
Answer: [2, 5, 8]
`range(2, 10, 3)` starts at 2 and steps by 3, producing 2, 5, 8 (stops before 10).
Which of the following correctly checks if a key exists in a dictionary `d`?
Answer: 'k' in d
The `in` operator checks for key membership in a dictionary; `has_key()` was removed in Python 3.
What is the difference between `is` and `==` in Python?
Answer: `is` checks identity (same object); `==` checks equality (same value)
`is` tests whether two variables point to the exact same object in memory, while `==` tests whether their values are equal.