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Python Programming - Variables

Exercise : Variables - General Questions
  • Variables - General Questions
1.
What is a variable?
An object that holds True by default
A value that is stored in a memory location
A named location in memory that stores a value
A method called implicitly while accessing the attributes of an object
Answer: Option
Explanation:

In Python, a variable is a named representation of a memory location that is used to store a value, such as a number, string, or boolean. By assigning a value to a variable, you can easily refer to that value later in your code.

2.
Which of the following is not a valid variable name?
my_variable
123_variable
_my_variable
MY_VARIABLE
Answer: Option
Explanation:

In Python, variable names must begin with a letter or an underscore, and can be followed by any combination of letters, underscores, and numbers.

Here are some examples of valid variable names in Python:

my_var
MyVar
_myVar
MyVar123
age
x25
india_bix_com

Here are some examples of invalid variable names in Python:

2myvar
my-var
my var
food+nonfood

Variable names in Python must start with a letter or an underscore. They can contain letters, numbers, and underscores. They cannot start with a number or contain any spaces.

3.
Which data type is assigned to a variable that contains a string?
byte
char
str
text
Answer: Option
Explanation:

In Python, the str data type is used to represent strings of text. Strings are immutable sequences of Unicode characters. They are denoted by single quotes ('), double quotes ("), or triple quotes (''' or """) and can contain any Unicode character.

Here are some examples of strings in Python:

'Hello, IndiaBIX!'

"This is a string."

'''This is a
multiline string.'''
4.
Which of the following is the correct way to assign a value of 5 to a variable called 'x'?
x = 5
int x = 5
var x = 5
def x = 5
Answer: Option
Explanation:
In Python, you can assign a value to a variable using the equal sign = . The variable name comes first, followed by the value to be assigned.
5.
What happens when you assign a new value to an existing variable?
The old value is replaced with the new value in the same memory location
The variable is assinged to a new memory location that holds the new value
The variable may or may not use the same memory location that holds the new value
Python returns an error message and stops running the code
Answer: Option
Explanation:

In Python, when you assign a new value to an existing variable, the variable may or may not use the same memory location, depending on the type of the new value and whether it is mutable or immutable.

For immutable types such as int, float, and str, a new memory location is typically created for the new value, and the variable is updated to reference this new memory location.

For mutable types such as list, dict, and set, the memory location could remain the same if the size of the data does not change. However, if the size of the data changes, a new memory location may be allocated to store the updated value.

In the case of the string variable in the example:

my_string = "Hello"
print(my_string)  # Output: Hello

my_string = "World"
print(my_string)  # Output: World

The string variable my_string would reference a new memory location after being reassigned to "World" because strings are immutable in Python.

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