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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

bookString Slicing

Great, now you've grasped how to pull out a single character from a string. But what if you want to grab several consecutive characters? Sure, you can pick them out individually, but that seems a tad tedious, doesn't it?

It sure does. To retrieve multiple characters in one go, you can use a technique called slicing. For this, employ square brackets and denote the beginning and end indices with a colon : in between. It's crucial to note that the end index isn't included. So, when you use [1:5], you're selecting characters at indices 1 through 4. Check out the example below.

As you'll notice, the end position is always one more than the last character's index you want to include. In the above example, there are 10 positions, but the final index is 9.

Note

Don't forget that spaces count as characters and have their own indices. Refer to the example below for clarity.


              
123456

            
# Initial strings
site = "codefinity"
greeting = "How are you"
# Slice strings
print(site[0:4], site[6:10])
print(greeting[2:5], greeting[6:11])
copy

Given the string "Python" saved in the language variable, your task is to extract the substrings "tho" and "on". To help, the indices for this string are outlined below.

question-icon

Fill in the blanks to complete the task.

# Initial variable
language = "Python"
# Output the string parts
print(language[:])
print(language[:])
tho
on

Click or drag`n`drop items and fill in the blanks

Note

Keep in mind that slicing does not include the final index. Therefore, when you use language[2:5], it includes the elements at indices 2, 3, and 4, but excludes the element at index 5.

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Section 2. Chapter 10
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