Literals and Variables in Python

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Questions and Answers

Which of the following is NOT considered a literal in Python?

`True` (correct)

`'Hello'`

`10.50`

`10`

What will be the result of the variable assignment `name = 'Alice'`?

A string variable named name (correct)

A list variable named name

A floating-point variable named name

An integer variable named name

Which of the following correctly describes a tuple in Python?

A string that can change

A collection of unordered values

An ordered, immutable set of values (correct)

A mutable set of values

Which of the following statements is correct regarding Python keywords?

Keywords are reserved for special uses in Python. Signup and view all the answers

In Python, how is a comment indicated?

By starting a line with <code>#</code> Signup and view all the answers

Which of the following variable names is valid in Python?

length_rectangle Signup and view all the answers

What type of data does the variable `b = [2, 9, 4]` represent?

List Signup and view all the answers

Which of the following is true about the statement `if x < 10:`?

It is a control structure. Signup and view all the answers

What symbol is used in Python to indicate that a physical line should continue onto the next line?

Backslash (<code>\</code>) Signup and view all the answers

Which of the following correctly suppresses the newline character at the end of a print statement?

print('Hello', end=' ') Signup and view all the answers

What is the purpose of a continuation line in Python?

To extend a statement that doesn't fit on one line. Signup and view all the answers

What must be done to properly display multiple strings on the same line in a print statement?

All of the above Signup and view all the answers

Which of the following statements is true about indentation in continuation lines?

Only the first physical line requires indentation. Signup and view all the answers

What will be the output of the following code: `print('Hello' + 'World')`?

HelloWorld Signup and view all the answers

What does the format code `%d` represent in the context of the print function?

Decimal format Signup and view all the answers

What would be the result of executing: `print('Value:', 'API', 1, 'or', '0')`?

Value: API 1 or 0 Signup and view all the answers

What will happen if a string is passed to the `%d` format code?

Auto conversion will happen Signup and view all the answers

How can you display two strings separated by a space using concatenation?

print('Hello' + ' ' + 'World') Signup and view all the answers

Which of the following format codes is used for displaying floating-point numbers?

%f Signup and view all the answers

What will be the output of executing: `print ('Length is %d and Breadth is %d' %(8, 5))`?

Length is 8 and Breadth is 5 Signup and view all the answers

What is incorrect about this print statement? `print('Hello World!' + 'It might rain today')`

It doesn't show space between strings. Signup and view all the answers

Study Notes

Literals in Python

Python has different literals, these are values that are directly represented in the code
Integer literal is a whole number, example 10
Floating-point literal is a decimal number, example 10.50
Imaginary literal is a complex number, example 10.50j
String literal is a sequence of characters, enclosed in single or double quotes, example 'Hello' or "World!"
Triple-quoted strings are used for multi-line strings and can span multiple lines, example '''Hello World!It might rain today\n# Triple-quoted string literal\nTomorrow is Sunday'''

Variables in Python

Variables are used to store data in a program
To set a variable, use the equals sign (=) followed by the data it stores
Variable names can consist of letters, numbers, and underscores
Example l = 10, length = 10, length_rectangle = 10.0, k="Hello World!"
Different data types are stored in variables:
- Integer: Example l = 10, length = 10
- Floating-point: Example length_rectangle = 10.0
- String: Example k="Hello World!"
- Boolean: Example a=True
- List: Example b=[2,9,4] - A list is an ordered, mutable sequence of elements
- Tuple: Example c=('apple', 'mango', 'banana') - A tuple is an ordered, immutable sequence of elements

Keywords in Python

Keywords are reserved words used for special purposes
Consist of lowercase letters only
Cannot be used as identifiers
Python has 30 keywords:
- and, assert, break, class, continue, def, del, elif, else, except, exec, finally, for, from, global, if, import, in, is, lambda, nonlocal, not, or, pass, raise, return, try, while, with, yield

Comments in Python

Comments are for documentation purposes
Ignored by the interpreter
Start a comment with the hash sign (#)
All characters after the # until the end of the line are part of the comment
Example:
- # This program computes area of rectangle
- a=b+c # values of b and c are added and stored in a

Continuation Lines in Python

A physical line is what you see in the code
A logical line is a single Python statement
The end of a physical line usually marks the end of a statement
To continue a statement on the next line, use a backslash (\) at the end of the first line
Example:
- print('This is a long statement that' \
  - 'continues on the next line.')`
Python also allows implicit line continuation if an opening parenthesis ((), bracket ([ ), or brace ({) is not closed on the same line.

Printing using the `print()` function

The print() function is used for displaying messages and results
Syntax: print(["message"][variable list])
Example:
- print("Hello World!")
- print(10)
- print(1)
- print("Length is ", 1)
By default, print() adds a newline character at the end
Use end='' to suppress the newline character and add a space instead
Example:
- print("Hello World!", end=" ")
- print('It might rain today')
Can concatenate strings with + or ,
Format codes (%) can be used to insert values in a string:
- %s for strings
- %d for integers
- %e for exponential format
- %f for floating-point format
- %o for octal format
- %x for hexadecimal format
- %c for ASCII code
Example:
- print ("Length is %d and Breadth is %d" %(l,b))
Automation conversion takes place if the data type doesn't match the format code

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Description

This quiz covers the fundamental concepts of literals and variables in Python programming. Explore different types of literals such as integers, floating-point numbers, and strings, along with how to define and use variables. Test your knowledge on how these elements are utilized within code.