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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:


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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:


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# 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"

Task

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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.

Requirements checklist

Check that the variable dairy1 is equal to the substring of grocery_items from index 0 up to (but not including) the index of the first space.
Check that the variable dairy2 is equal to the substring of grocery_items starting just after the first space and ending at the index just before the second space.
Check that the variable bakery1 is equal to the substring of grocery_items starting just after the second space and ending at the index just before the third space.
Check that the printed output matches the format: "We have dairy and bakery items: , , and in aisle 5." with the correct extracted values.

Solution

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Section 2. Chapter 6

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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"

Task

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.

Requirements checklist

Check that the variable dairy1 is equal to the substring of grocery_items from index 0 up to (but not including) the index of the first space.
Check that the variable dairy2 is equal to the substring of grocery_items starting just after the first space and ending at the index just before the second space.
Check that the variable bakery1 is equal to the substring of grocery_items starting just after the second space and ending at the index just before the third space.
Check that the printed output matches the format: "We have dairy and bakery items: , , and in aisle 5." with the correct extracted values.

Solution

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

Swipe to show menu

String Slicing and Concatenation

Example Application

Output Requirements

Requirements checklist

Solution

Awesome!

Awesome!

String Slicing and Concatenation

Example Application

Output Requirements

Requirements checklist

Solution

Awesome!