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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

bookCombining Conditions

In Boolean logic, two fundamental operators are OR and AND. What do they represent?

The OR operator checks if either of the conditions is true and returns True if so; otherwise, it returns False.

The AND operator ensures both conditions are true before returning True. If not, it returns False. In Python, to combine conditions, use the and & or operators (always in lowercase).

For example:

  • condition1 and condition2 yields True only when both conditions are True;
  • condition1 or condition2 gives True if at least one condition is True.

Note

You can also chain more than two conditions using these operators. Employ parentheses to clarify the order of operations.

As an illustration, consider these conditions:

  1. Whether 2 exceeds 1 and if "bbb" isn't the same as "aaa";
  2. If the character with index 2 in the string "my string" is either "y" or "s".

              
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# Check the first two conditions
print(2 > 1 and "bbb" != "aaa")
# Check the next two conditions
print("my string"[2] == "y" or "my string"[2] == "s")
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How should we interpret the outcomes? The initial print() issues a True response since both 2 > 1 and "bbb" != "aaa" hold true. The following print() yields False because the character at index 2 is neither 'y' nor 's' (it's actually a space).

Note

If you wish to reverse a boolean value, employ the not operator. For instance, not 1 == 1 results in False because 1 == 1 is True, and we've negated that to False.

What output does the subsequent code produce?

What output does the subsequent code produce?

Select the correct answer

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Section 3. Chapter 3
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