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Introduction to Python
course content

Course Content

Introduction to Python

Introduction to Python

1. First Acquaintance
The Very First StepsCommentsSome Simple MathMore Challenging MathChallengeBringing It All Together
2. Variables and Types
Storing NumbersNaming RulesUsing VariablesData TypesNumbersChallengeStoring TextString IndexingNegative Indexing and LengthString SlicingChallengeConcatenation
3. Conditional Statements
Boolean Data TypeChallenge: Comparison OperatorsCombining ConditionsChallenge: Logical OperatorsMembership Operators and Types ComparisonSimple if/else ExpressionsChallenge: Grocery StoreChallenge: Odd and Evenif/elif/else ExpressionsChallenge: Grocery Store ExtendedChallenge: Positive, Negative or Zero
4. Other Data Types
What Is a List?List MethodsChallengeNested ListsChallengeWhat Is a Tuple?Tuple MethodsChallengeNested TuplesChallengeWhat Is a Dictionary?ChallengeDictionary MethodsChallenge
5. Loops
while LoopChallengefor LoopChallengeRangeChallengeIterating Over IndexesNested Loops
6. Functions
Built-in FunctionsChallengeDefining Your First FunctionChallengeif/else Statements in FunctionsChallengeFunctions With No ReturnChallengeModifying FunctionsChallengeLambda FunctionsChallenge

bookWhat Is a List?

A list is a data type that can hold multiple items, which can be of various types such as numbers, strings, tuples, and more.

To create a list, simply place a series of comma-separated values or variables inside square brackets []. Alternatively, you can convert other iterable objects (like strings, sets, or tuples) into lists using the list() function.

For instance, let's craft a list that contains details about the USA (name of the country, its land area, and population):


              
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# Create list
US_Info = ["USA", 9629091, 331002651]
print(US_Info)
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Accessing elements within a list is similar to how you'd access characters in a string: through indexing and slicing. For instance, if we wanted to retrieve both the land area and population data, we'd target the second (index 1) and third (index 2) items in the list US_Info. When slicing, you specify the start and end positions using a colon :.

Note

Remember that the upper limit of the slice is not included. Hence, to retrieve these two elements, the slicing syntax [1:3] should be used.

Check out the example provided:


              
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# Getting area and population
US_Info = ["USA", 9629091, 331002651]
print(US_Info[1:3])
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Section 4. Chapter 1
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