Working with Data in Python

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Questions and Answers

What will the output of the statement 'print("Sum is", _sum)' be if num1 and num2 are both inputs as '1'?

  • 11 (correct)
  • 1
  • 2
  • Error due to data type

Which of the following correctly converts the input values to integers before performing addition?

  • num1 = input("Enter number1: ") and num2 = input("Enter number2: ")
  • num1 = float(input("Enter number1: ")) and num2 = float(input("Enter number2: "))
  • num1 = input("Enter number1: ") + num2 = input("Enter number2: ")
  • num1 = int(input("Enter number1: ")) and num2 = int(input("Enter number2: ")) (correct)

If the statement _sum = num1 + num2 is executed where num1 = 'Hello' and num2 = 'World', what will be the result?

  • TypeError
  • Hello + World
  • 'HelloWorld' (correct)
  • 'Hello World'

What is the purpose of explicitly converting input data types in Python?

<p>To store values in a format suitable for arithmetic operations (C)</p> Signup and view all the answers

In Python, what will happen if you try to add two string representations of numbers without converting them?

<p>It will return a concatenated string of the two values. (A)</p> Signup and view all the answers

What happens when you use the input() function in Python?

<p>It always returns a string value. (B)</p> Signup and view all the answers

Which function can convert a float represented as a string into an actual float in Python?

<p>float() (A)</p> Signup and view all the answers

When defining a string variable in Python, which of the following is a correct syntax?

<p>Both A and B (D)</p> Signup and view all the answers

What will be the output of this code: print('Hello', 5, 10.5)?

<p>'Hello 5 10.5' (B)</p> Signup and view all the answers

Which of the following statements is true about data type conversion in Python?

<p>All of the above. (D)</p> Signup and view all the answers

What data type is best used to represent an age?

<p>Integer (B)</p> Signup and view all the answers

Which example appropriately represents a float?

<p>50.5 (D)</p> Signup and view all the answers

What distinguishes a boolean data type?

<p>It only denotes true or false. (D)</p> Signup and view all the answers

Which statement is true regarding strings?

<p>They can include letters, numerals, and special characters. (B)</p> Signup and view all the answers

When should an ID number be considered a string?

<p>When it includes alphabetical characters. (A)</p> Signup and view all the answers

How is a boolean value represented in code?

<p>True or False (D)</p> Signup and view all the answers

Which of the following correctly describes the float data type?

<p>Can include decimals. (D)</p> Signup and view all the answers

Which data type is best for representing a license plate number?

<p>String (B)</p> Signup and view all the answers

What is the result of the operation $16 % 3$?

<p>1 (D)</p> Signup and view all the answers

Which operator produces a float regardless of the operands?

<p>Division (C)</p> Signup and view all the answers

Performing addition between an integer and a float results in what type?

<p>Float (C)</p> Signup and view all the answers

Which operator is used to obtain the remainder of a division?

<p>Modulo (D)</p> Signup and view all the answers

What is the result of the operation $5 / 2$ in Python?

<p>2.5 (D)</p> Signup and view all the answers

What does the negation operator (-) do in Python?

<p>Inverts the sign of a number (B)</p> Signup and view all the answers

Flashcards

Data type conversion

Explicitly changing the data type of a value.

String concatenation

Joining strings together.

Input data type mismatch

Using incorrect data type for operations.

Integer data type

Whole numbers (e.g., -2, 0, 5).

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String data type

Sequence of characters (e.g., “Hello”).

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String

Text data; composed of letters, numbers, and special characters. Enclosed in quotation marks.

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Integer

Whole numbers (no decimals). Used for counts.

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Float

Decimal numbers. Used for precise measurements.

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Boolean

Data that's either true or false.

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Data Type

Categories for data in a computer; tell the computer how to handle the value.

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Example of String

A sequence of characters (letters, numbers, symbols) enclosed within quotes.

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Example of Integer

A whole number without any decimal part.

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Example of Float

A number containing a decimal part.

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Python Data Types

Python automatically identifies data types like integers, floats, and strings based on their format.

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Data Type Converters

Functions like int(), float(), and str() change a value's data type.

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Input() returns a string

The input() function in Python always returns a string, even when the user inputs a number.

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Conversion Functions

Python functions like int(), float(), str(), and bool() convert values into different data types.

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Python Operators

Symbols like + (addition) are used for calculations in Python.

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Negation Operator

The negation operator (-) changes the sign of a number. It's used to make a positive number negative, or a negative number positive.

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Addition Operator

The addition operator (+) adds two numbers together.

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Subtraction Operator

The subtraction operator (-) subtracts one number from another.

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Multiplication Operator

The multiplication operator (*) multiplies two numbers together.

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Division Operator

The division operator (/) divides one number by another, producing a floating-point (decimal) result.

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Integer Division Operator

The integer division operator (//) divides two numbers and rounds the result down to the nearest whole number.

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Modulo Operator

The modulo operator (%) calculates the remainder after dividing one number by another.

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Mixing Integers and Floats

In Python, if you perform arithmetic operations between integers and floats, the result will always be a float.

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Calculating with Operators

You can combine operators in Python to perform complex calculations.

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Python Operators - Converting Fahrenheit to Celsius

You can use Python operators to convert Fahrenheit to Celsius.

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Study Notes

Working with Data (Python)

  • This presentation discusses data types and operators in Python.
  • Recalling previous topics like output, assignment, and input statements is covered.
  • Data types, including strings, integers, floats, and booleans are explained. Strings are text. Integers are whole numbers. Floats are decimals. Booleans have two states, True or False.
  • String variables in code are enclosed in quotation marks.
  • Each data type has specific uses (e.g., integers for counts, floats for measurements).
  • Code examples are provided illustrating how to combine data types and use operators correctly.
  • Example operators are: +, -, *, /, // (floor division), % (modulo remainder).
  • Converting data types is important, especially using int() and float() on input from the user to make calculations.
  • Example computations are presented.
  • Conversion examples in the slides include translating between int(), float(), str(), and bool() data types.

Data Types

  • Python recognizes and deals with various data types.
  • Data type converters help change data types.
  • Data types like strings, integers, floats, and booleans are important for manipulating data in Python.

Operators in Python

  • Many operators are available in Python.
  • The arithmetic operators are the most frequently used.
  • The following operators were shown and explained: negation (-), addition (+), subtraction (-), multiplication (*), division (/), integer division (//), modulo (%).
  • int(), float(), str(), and bool() help convert between these data types.
  • Python treats operations on integers and floats differently, producing a float as the result of arithmetic operations that include floats.
  • Examples were shown with operators in the command line (shell).

Summary

  • Python data types include integer, float, string, and boolean.
  • Python operations or calculations utilize operators like + (addition), - (subtraction), * (multiplication), / (division), // (floor division), % (modulo).
  • Data type converters are crucial when working with user input.

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