Kursinnehåll

Introduction to Python (copy)

1. Getting Started

First Steps Comments Simple Math: Add & Subtract Simple Math: Multiply & Divide Recap

2. Variables and Types

Data Types Storing Data in Variables Variable Naming Rules Using Variables String Indexing and Length String Slicing and Concatenation Challenge: Inventory Sorting Capstone Recap

3. Conditional Statements

Boolean Data Type Combining Conditions Challenge: Boolean Logic Membership Operators and Type Comparisons Conditional Expressions Challenge: Product Management Capstone Recap

4. Other Data Types

Lists and List Methods Nested Lists Challenge: List Management Tuples and Tuple Methods Tuple Operations Challenge: Tuple Operations Dictionaries and Dictionary Methods Challenge: Pricing Adjustment Capstone Recap

5. Loops

For Loops While Loops Range Function Iterating Over Indexes Challenge: Sales and Shipments Nested Loops Challenge: Automating Stock Control Challenge: Solo Coding Capstone Recap

6. Functions

Built-in Functions Challenge: Zip and Sort Functions User Defined Functions List Behavior in Functions Functions with no Return Modifying Functions Challenge: Product Revenues Capstone Recap

String Slicing and Concatenation

String slicing and concatenation are essential techniques in Python for manipulating sequences of characters. By understanding how to slice and combine strings (concatenation), you can efficiently process text data, which is crucial in many programming contexts.

In the following video, Alex will demonstrate the practical applications of string slicing and concatenation. Watch closely, as these concepts are key to effective string manipulation:

String slicing allows you to extract substrings from a larger string by specifying the start and end indices. The syntax string[start:end] is used, where start is the index of the first character you want to include, and end is the index one past the last character you want to include. This technique is especially useful for breaking down and analyzing strings by parts.

Example Application

Let's take a closer look at how slicing works:


              1234567
            
fruit = "Strawberries"

# Slicing the string to get "Straw"
# Remember, the 'w' is indexed at 4 but if we want to include it in the slice, we need to go up to 5 
sliced_fruit = fruit[0:5]

print("Sliced part:", sliced_fruit)

Concatenation is the process of joining two or more strings end-to-end, forming a new string.

This is achieved using the + operator, making it straightforward to combine strings for various purposes, such as creating full sentences or generating formatted output.

Here's how you can concatenate strings to create a new string:


              12345678
            
# Concatenating strings
part1 = "Straw"
part2 = "berry"
new_word = part1 + part2  # "Strawberry"
print("Concatenated word:", new_word)

# If you want to separate the words with a space, you need to add " " between the two parts
print(part1 + " " + part2)  # "Straw berry"

Uppgift

Swipe to start coding

Extract specific grocery items from a string and create a message about their store location.

Use the given string grocery_items, which contains a list of items.
Use string slicing to extract the dairy items "milk" and "cheese", and assign them to dairy1 and dairy2.
Extract the bakery item "bread" using slicing and assign it to bakery1.
Use string concatenation to build a message stating that these items are in aisle 5.

Output Requirements

Print the following message format:

We have dairy and bakery items: <dairy1>, <dairy2>, and <bakery1> in aisle 5.

Lösning

Byt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedan

Var allt tydligt?

Tack för dina kommentarer!

Avsnitt 2. Kapitel 6

String Slicing and Concatenation

In the following video, Alex will demonstrate the practical applications of string slicing and concatenation. Watch closely, as these concepts are key to effective string manipulation:

Example Application

Let's take a closer look at how slicing works:


              1234567
            
fruit = "Strawberries"

# Slicing the string to get "Straw"
# Remember, the 'w' is indexed at 4 but if we want to include it in the slice, we need to go up to 5 
sliced_fruit = fruit[0:5]

print("Sliced part:", sliced_fruit)

Concatenation is the process of joining two or more strings end-to-end, forming a new string.

This is achieved using the + operator, making it straightforward to combine strings for various purposes, such as creating full sentences or generating formatted output.

Here's how you can concatenate strings to create a new string:


              12345678
            
# Concatenating strings
part1 = "Straw"
part2 = "berry"
new_word = part1 + part2  # "Strawberry"
print("Concatenated word:", new_word)

# If you want to separate the words with a space, you need to add " " between the two parts
print(part1 + " " + part2)  # "Straw berry"

Uppgift

Swipe to start coding

Extract specific grocery items from a string and create a message about their store location.

Use the given string grocery_items, which contains a list of items.
Use string slicing to extract the dairy items "milk" and "cheese", and assign them to dairy1 and dairy2.
Extract the bakery item "bread" using slicing and assign it to bakery1.
Use string concatenation to build a message stating that these items are in aisle 5.

Output Requirements

Print the following message format:

We have dairy and bakery items: <dairy1>, <dairy2>, and <bakery1> in aisle 5.

Lösning

Byt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedan

Var allt tydligt?

Tack för dina kommentarer!

Avsnitt 2. Kapitel 6

Byt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedan