Python Keywords

Sure! Here are some of the most commonly used Python keywords:

• 'and'
• 'as'
• 'assert'
• 'break'
• 'class'
• 'continue'
• 'def'
• 'del'
• 'elif'
• 'else'
• 'except'
• 'finally'
• 'for'
• 'from'
• 'global'
• 'if'
• 'import'
• 'in'
• 'is'
• 'lambda'
• 'not'
• 'or'
• 'pass'
• 'raise'
• 'return'
• 'try'
• 'while'
• 'with'
• 'yield'

These keywords have specific meanings in Python and cannot be used as variable names or any other identifiers.

The 'def' keyword in Python is used to define a function. It is followed by the function name and a set of parentheses, which may contain parameters. The function definition is then followed by a colon and an indented block of code that makes up the function body.

Here's an example:

# Function definition

def greet(name):
    print('Hello, ' + name + '!')

# Function call

greet('Alice')

In this example, the 'def' keyword is used to define a function called 'greet' that takes a parameter 'name'. The function body prints a greeting message using the provided name. The function can be called later using the function name and passing an argument.

The 'pass' keyword in Python is used as a placeholder when a statement is required syntactically but no action is needed. It is often used as a placeholder for code that will be implemented later.

Here's an example:

if x < 0:
    pass  # TODO: Implement error handling
else:
    print('Positive number')

In this example, the 'pass' keyword is used as a placeholder in the 'if' statement. It indicates that no action is needed for the negative case, but the code will be implemented later. Without the 'pass' keyword, the code would result in a syntax error.

If a function doesn't have a return statement, it will still execute the code inside the function but it will not return any value. In this case, the function will implicitly return 'None', which is a special value in Python that represents the absence of a value. It is important to note that 'None' is not the same as '0' or an empty string, it is a unique object in Python.

Yes, a function can return multiple values in Python. This can be achieved by returning a tuple, which is an ordered collection of elements. The values to be returned can be enclosed in parentheses and separated by commas. For example:

def get_name_and_age():
    name = 'John'
    age = 25
    return name, age

name, age = get_name_and_age()
print(name)  # Output: John
print(age)  # Output: 25

Certainly! Here's an example of an 'if' statement in Python:

x = 10

if x > 5:
    print('x is greater than 5')

The 'elif' keyword is used to specify an additional condition to be checked if the previous 'if' or 'elif' condition(s) are false. It allows you to chain multiple conditions together. The 'else' keyword is used to specify a block of code to be executed if none of the previous conditions are true. Here's an example that demonstrates the usage of 'elif' and 'else' with 'if':

x = 10

if x > 5:
    print('x is greater than 5')
elif x < 5:
    print('x is less than 5')
else:
    print('x is equal to 5')

Sure! Here's an example of a 'for' loop that iterates over a list of numbers and prints each number:

numbers = [1, 2, 3, 4, 5]

for num in numbers:
    print(num)

Output:

1
2
3
4
5

The 'break' keyword is used to exit a 'for' loop prematurely. When the 'break' keyword is encountered inside a 'for' loop, the loop is immediately terminated and the program execution continues with the next statement after the loop. This can be useful when you want to stop the loop execution based on a certain condition.

In Python, when an exception occurs within a 'try' block, the code execution is immediately transferred to the 'except' block. The 'except' block catches the exception and executes the code within it. If there is no matching 'except' block for the raised exception, the program terminates and displays an error message.

Certainly! Here's an example:

try:
    x = 10 / 0
except ZeroDivisionError:
    print('Error: Division by zero')