Basics Flashcards
What symbol is used for single-line comments in Python?
#
How are code blocks defined in Python (e.g., if statements)?
Using indentation (spaces/tabs).
What is dynamic typing?
Variables can change data type after assignment (e.g., x = 5 → x = \"text\").
What are invalid variable names?
Names starting with numbers or symbols (e.g., 2var, my-var).
What is the difference between 5 and 5.0?
5 is an int (integer); 5.0 is a float (decimal).
How do you write a multi-line string?
Use triple quotes: '''Line 1\nLine 2''' or \"\"\"Line 1\nLine 2\"\"\".
What is the output of \"hello\".upper()?
\"HELLO\".
What is a falsy value in Python?
0, \"\", None, [], {}, (), False.
How do you reverse a list in-place?
Use .reverse(): my_list.reverse().
What method adds an item to the end of a list?
.append(item) (e.g., my_list.append(5)).
What is the difference between a list and a tuple?
Lists are mutable; tuples are immutable.
How do you create a single-element tuple?
Add a trailing comma: my_tuple = (\"item\",).
What method returns key-value pairs in a dictionary?
.items() (e.g., my_dict.items() → (key, value) pairs).
How do you safely get a value from a dictionary?
Use .get(key) (returns None instead of KeyError).
What is a set?
An unordered collection of unique elements (e.g., {1, 2, 3}).
How do you add multiple elements to a set?
Use .update(): my_set.update([4, 5]).
What does int(\"10\") return?
The integer 10.
How do you convert a list to a tuple?
Use tuple(): tuple([1, 2, 3]) → (1, 2, 3).
What is the output of list(\"hi\")?
['h', 'i'].
What is the result of bool(\"\")?
False (empty strings are falsy).
How do you split a string into a list?
“Use .split(): `"a
