AQA String Manipulation

String Manipulation

​String Concatenation

• ​The + operator does not just add two numbers

• It can also “add” two strings

• The process of combining two strings is called string concatenation

• Performing string concatenation creates a brand new string comprised of the first string’s contents followed by the second string’s contents

​String Concatenation

• ​The + operator does not just add two numbers

• It can also “add” two strings

• The process of combining two strings is called string concatenation

• Performing string concatenation creates a brand new string comprised of the first string’s contents followed by the second string’s contents

​Concatenation does not include spaces between the strings!

​Finding position

Casting

There may be times when you want to specify a type on to a variable. This can be done with casting.

• int() - constructs an integer number from an integer literal, a float literal (by removing all decimals), or a string literal (providing the string represents a whole number)

• float() - constructs a float number from an integer literal, a float literal or a string literal (providing the string represents a float or an integer)

• str() - constructs a string from a wide variety of data types, including strings, integer literals and float literals

Multiple Choice

What is concatenation in python?

• Concatenation in Python refers to the method of converting strings to integers.
• Concatenation in Python is the process of combining strings using the '+' operator.
• Concatenation in Python is the process of splitting strings using the '-' operator.
• Concatenation in Python is the technique of reversing strings using the '*' operator.

Multiple Choice

What is casting in python?

• Casting is a method for defining functions in Python.
• Casting in Python is the process of converting one data type to another.
• Casting refers to the process of creating new data types in Python.
• Casting is a way to optimize memory usage in Python.

Multiple Choice

What is a substring / slicing in python?

• Extracting a character from a string using string[index]
• Substring or slicing in Python is the process of extracting a portion of a string using the syntax string[start:end].
• Replacing a portion of a string with another string
• Finding the length of a string using len(string)

​Python - String Length example

Multiple Choice

What will the output of this code be?

• 5

• 5
• 8
• 6
• 7

Concatenation

Multiple Choice

what do we call what is happening on line 4?

• concatenation

• Variable assignment
• Array declaration
• interpolation

Multiple Choice

What will output from this code?

• ABC123XYZ
• XYZ123
• XYZ123ABC
• 123ABCXYZ

Multiple Choice

What will output from this code?

• XYZABC123
• XYZ123ABC
• ABCXYZ123
• 123XYZABC

​​Casting

​Checking if a string is all digits

Convert character to character code + convert character code to character

​Substring / Slicing

Multiple Choice

Which will change the python input to lower case?

• user_input.toLowerCase()
• user_input.lowercase()
• user_input.lower()
• user_input.make_lower()

Multiple Choice

Which will change the python input to upper case?

• input_string.title()
• input_string.lower()
• input_string.capitalize()
• input_string.upper()

Multiple Choice

The pseudocode below assigns two strings to two variables:

title = "computer science"

level = "gcse"

What is title[0]?

• 'c'

• 'o'

• 'g'

• An error

Multiple Choice

The pseudocode below assigns two strings to two variables:

title = "computer science"

level = "gcse"

What is title[4]?

• 'p'

• 'u'

• 't'

• An error

Multiple Choice

The pseudocode below assigns two strings to two variables:

title = "computer science"

level = "gcse"

What is level concatenated (linked together) with title?

• "gcsecomputer science"

• "gcse computer science"

• "gcsecomputerscience"

• An error

Multiple Choice

What is will the output be of this code?

• None
• Error
• False
• True

Multiple Choice

What will the output of this code be?

• True
• Error
• False
• None

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