Core Python syntax, variable types, and common data structures (lists, dicts, tuples) explained with a short example each.
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- What is a variable in Python?
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A named container that stores a value. You assign it once and can refer to it by name throughout your code.- How do you assign a value to a variable in Python?
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Use the equals sign (=). Example: name = 'Alice'- What is dynamic typing in Python?
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The type of a variable is determined by the value assigned to it at runtime, and can change if reassigned.- What is the int data type in Python?
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A data type for whole numbers without a decimal point. Example: x = 5- What is the float data type in Python?
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A data type for numbers with a decimal point. Example: pi = 3.14- What is the str data type in Python?
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A sequence of characters enclosed in quotes (single, double, or triple). Example: text = 'Hello'- What is the bool data type in Python?
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A data type with only two values: True or False.- How do you create a list in Python?
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Use square brackets with comma-separated values. Example: nums = [1, 2, 3]- How do you access a single element in a list?
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Use the index in square brackets. Example: nums[0] returns the first element.- What is list indexing in Python?
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The position of an element in a list, starting from 0 for the first element.- What is negative indexing in Python?
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Using negative numbers to index from the end of a list. Example: nums[-1] is the last element.- How do you add an element to a list?
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Use the append() method. Example: nums.append(4) adds 4 to the end.- How do you remove an element from a list?
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Use remove() to delete by value, or pop() to delete by index. Example: nums.remove(2) or nums.pop(0)- What is a tuple in Python?
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An ordered collection of elements enclosed in parentheses that cannot be changed after creation.- How do you create a tuple?
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Use parentheses with comma-separated values. Example: coords = (10, 20)
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