Introduction to Python for Data Science Flashcards
7 cards from real Data Science with Python Certification practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Introduction to Python for Data Science flashcards as text
Which Python data type is immutable and can be used as a dictionary key?
Answer: tuple
Tuples are immutable sequences and can be used as dictionary keys, unlike lists or sets.
What does the `zip()` function return when passed two lists of unequal length?
Answer: Stops at the length of the shorter list
`zip()` stops producing tuples when the shortest input iterable is exhausted.
Which method removes and returns the last element of a Python list?
Answer: list.pop()
`list.pop()` removes and returns the last element by default, or an element at a given index.
What is the result of `bool([])` in Python?
Answer: False
An empty list is falsy in Python, so `bool([])` evaluates to `False`.
Which of the following correctly creates a dictionary using a dictionary comprehension?
Answer: {x: x**2 for x in range(5)}
Dictionary comprehensions use curly braces with a `key: value` expression followed by a `for` clause.
What will `'data'[::-1]` return in Python?
Answer: 'atad'
The slice `[::-1]` reverses a string by stepping backwards through all characters.
In Python, which keyword is used to define an anonymous function?
Answer: lambda
`lambda` creates small anonymous functions that can have any number of arguments but only one expression.
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