Python Data Types and Operations

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Questions and Answers

Which Python data type is used to represent whole numbers without any decimal points?

  • Integer (correct)
  • Float
  • Boolean
  • String

If you assign the value 5.0 to a variable in Python, what data type will Python automatically assign to that variable?

  • Integer
  • String
  • Float (correct)
  • Boolean

Which of the following values is considered a floating-point number in Python?

  • `"25.5"`
  • `25.5` (correct)
  • `"25"`
  • `25`

Which built-in Python function can be used to determine the data type of a variable during runtime?

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

What is the correct Python syntax to convert the integer 7 into a string?

<p><code>str(7)</code> (A)</p> Signup and view all the answers

Which Python function is used to convert the string "9.5" into a floating-point number?

<p><code>float(&quot;9.5&quot;)</code> (D)</p> Signup and view all the answers

Which of the following represents the correct way to convert the string "5" into an integer in Python?

<p><code>int(&quot;5&quot;)</code> (D)</p> Signup and view all the answers

In Python, what will be the result if you convert the string "False" to a boolean using bool("False")?

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

Which operator is used in Python to concatenate two or more strings together?

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

What is the correct way to concatenate the strings "Hello" and "World" in Python to produce "HelloWorld"?

<p><code>&quot;Hello&quot; + &quot;World&quot;</code> (A)</p> Signup and view all the answers

What happens in Python if you try to concatenate a string with an integer without explicitly converting the integer to a string?

<p>Python returns an error (D)</p> Signup and view all the answers

Given an integer variable points = 10, which of the following lines of code will correctly concatenate it with the string "Score: " to produce "Score: 10"?

<p><code>&quot;Score: &quot; + str(points)</code> (A)</p> Signup and view all the answers

Which operator is used to perform exponentiation (raising to a power) in Python?

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

What is the result of the expression 5 / 2 in Python 3?

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

In Python, what type of division does the // operator perform?

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

In Python, which mathematical operation has the highest precedence according to the order of operations?

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

What does the modulus operator % return?

<p>Remainder after division (B)</p> Signup and view all the answers

What is the result of the operation 10 % 3 in Python?

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

How can you determine if an integer variable x is an even number using the modulus operator?

<p><code>x % 2 == 0</code> (D)</p> Signup and view all the answers

What is the output of the expression 7 % 7?

<p><code>0</code> (C)</p> Signup and view all the answers

In Python, how are strings typically enclosed?

<p>Quotes <code>&quot;&quot;</code> or <code>' '</code> (C)</p> Signup and view all the answers

In Python, what is the index of the first character in a string?

<p><code>0</code> (B)</p> Signup and view all the answers

From which end of the string does negative indexing start in Python?

<p>The end of the string (B)</p> Signup and view all the answers

What will be the result of the expression "apple"[1] in Python?

<p><code>&quot;p&quot;</code> (A)</p> Signup and view all the answers

What does the .upper() method do to a string in Python?

<p>Converts to uppercase (C)</p> Signup and view all the answers

Which string method is used to remove whitespace from both the beginning and the end of a given string?

<p><code>.strip()</code> (C)</p> Signup and view all the answers

Which string method is used to find the index of a specific character or substring within a string?

<p><code>.find()</code> (A)</p> Signup and view all the answers

In Python, what would be the result of applying .replace("a", "o") to the string "banana"?

<p><code>&quot;bonono&quot;</code> (B)</p> Signup and view all the answers

What will "hello".count("l") return?

<p><code>2</code> (D)</p> Signup and view all the answers

What will "Hello, World!".startswith("Hello") return?

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

Which method is used to split a string into a list of substrings?

<p><code>.split()</code> (C)</p> Signup and view all the answers

What will "apple".endswith("e") evaluate to?

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

How do you correctly check if the substring "cat" is present within the string "concatenate" in Python?

<p><code>&quot;cat&quot; in &quot;concatenate&quot;</code> (A)</p> Signup and view all the answers

What will "123".isdigit() return in Python?

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

What will "python3".isalpha() return?

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

Which string method would you use to verify if the string "DOG" consists entirely of uppercase characters?

<p><code>.isupper()</code> (D)</p> Signup and view all the answers

What is the result of int(3.7)?

<p><code>3</code> (C)</p> Signup and view all the answers

What is the result of the expression "4" + "2" in Python?

<p><code>&quot;42&quot;</code> (C)</p> Signup and view all the answers

What will the expression "abcdef"[2:4] return?

<p><code>&quot;cd&quot;</code> (A)</p> Signup and view all the answers

What is the output of len("hello world") in Python?

<p><code>11</code> (A)</p> Signup and view all the answers

Flashcards

Integer

Represents whole numbers without decimals.

Float

Data type assigned to numbers with decimal points.

Floating-point number

A number that includes a decimal point.

type()

Function that checks the data type of a variable.

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str(7)

Converts the integer 7 to its string representation.

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float("9.5")

Converts the string '9.5' into a floating-point number.

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int("5")

Converts the string '5' to its integer representation.

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bool("False")

Returns a boolean True value.

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String concatenation: +

Symbol used to join strings.

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"Hello" + "World"

Correctly joins strings 'Hello' and 'World'.

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Concatenate: string + int

Python returns an error.

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"Score: " + str(points)

To concatenate "Score: " with the integer variable points.

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Exponentiation: **

Calculates exponentiation in Python.

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5 / 2

The result of integer division 5 / 2 in Python.

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Integer division: //

Performs integer (floor) division in Python.

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Math precedence

Parentheses have the highest precedence.

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Modulus operator (%)

Returns the remainder.

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10 % 3

Returns the value of 1.

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x % 2 == 0

Checks if x is an even number using modulus.

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7 % 7

The output is 0.

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Strings in Python

Enclosed in quotes (", ").

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First character index

The index of the first character is 0.

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Negative indexing start

The end of the string.

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"apple"[1]

The letter 'p'.

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.upper()

Converts to uppercase.

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.strip()

Removes whitespace from both ends of a string.

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.find()

Finds the index of a character.

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".replace("a", "o")"

The string "bonono".

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"hello".count("l")

Returns 1.

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".startswith("Hello")"

Returns true.

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.split()

Splits into a list.

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".endswith("e")"

Evaluates to True.

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Check if string consists of substring

"cat" in "concatenate"

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".isdigit()"

Returns True.

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".isalpha()"

Returns False.

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".isupper()"

To verify if 'DOG' is uppercase.

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int(3.7)

The result of int(3.7).

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"4" + "2"

The string "42".

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"abcdef"[2:4]

The letters 'cd'.

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len("hello world")

It will print 11.

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Study Notes

  • Python's Integer data type represents whole numbers, and excludes decimals.
  • The data type Float is assigned to the number 5.0 in Python.
  • The value 25.5 is a floating-point number.
  • The function type() checks the data type of a variable in Python.
  • str(7) converts the integer 7 to a string.
  • The function float("9.5") converts the string "9.5" into a floating-point number.
  • int("5") converts the string "5" to an integer.
  • bool("False") conversion results in True.

String Concatenation

  • The plus sign + concatenates strings in Python.
  • "Hello" + "World" correctly concatenates the two strings.
  • Python returns an error when attempting to concatenate a string and an integer without converting the integer's type.
  • "Score: " + str(points) concatenates "Score: " with the integer variable points.

Python Math

  • ** calculates exponentiation in Python.
  • The result of 5 / 2 in Python is 2.5.
  • // performs integer (floor) division in Python.
  • Parentheses have the highest precedence in math operations.

Modulus Operator

  • The modulus operator % returns the remainder after division.
  • The result of 10 % 3 is 1.
  • x % 2 == 0 checks if x is an even number using the modulus operator.
  • The output of 7 % 7 is 0.

Python Strings

  • Strings in Python are enclosed in single ' ' or double quotes "".
  • The index of the first character in a Python string is 0.
  • Negative indexing in Python strings begins from the end of the string.
  • "apple"[1] results in "p".

String Methods

  • .upper() converts a string to uppercase.
  • .strip() removes whitespace from both ends of a string.
  • .find() locates the index of a character in a string.
  • "banana".replace("a", "o") yields "bonono".
  • "hello".count("l") returns 2.
  • "Hello, World!".startswith("Hello") returns True.
  • .split() splits a string into a list.
  • "apple".endswith("e") evaluates to True.

Checking Strings

  • "cat" in "concatenate" checks if "cat" is in "concatenate".
  • "123".isdigit() returns True.
  • "python3".isalpha() returns False.
  • .isupper() verifies if "DOG" is uppercase.

Mixed Review

  • int(3.7) results in 3.
  • "4" + "2" is "42".
  • "abcdef"[2:4] returns "cd".
  • len("hello world") outputs 11.

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