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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

bookif/else Statements in Functions

Everything we've discussed up to this point can be utilized within a function. For instance, you can easily embed conditional statements within the body of a function. In the third section, you crafted an if/else statement to determine if a number is odd or even. But, this code is set up for specific numbers.

If you wanted to evaluate a different number, you'd either have to replicate the same code block with a new number or modify the existing number before the conditional check. Instead, it's more efficient to encapsulate this code within a function and then invoke it for various numbers as needed.


              
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# Define a function
def is_odd(n):
  if n % 2 == 0:
    return "even"
  else:
    return "odd"

# Testing function
print('2 is', is_odd(2))
print('3 is', is_odd(3))
copy

Note

Just a heads up: A number is deemed even if it divides by 2 with no remainder. The % operator is used to find this remainder.

Clearly, the function accurately recognizes 2 as even and 3 as odd. You can call upon this function as often as required for various numbers.

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Section 6. Chapter 5
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