Multiple parameters in Python - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does it mean when a Python function has multiple parameters?

It means the function can accept more than one input value, each separated by a comma, to perform its task.

beginner

How do you define a function with two parameters named a and b in Python?

Use def function_name(a, b): to define a function that takes two inputs named a and b.

beginner

What happens if you call a function with multiple parameters but provide fewer arguments than parameters?

Python will give an error because it expects all required parameters to have values unless they have default values.

intermediate

Can a Python function have parameters with default values? How does it affect calling the function?

Yes, parameters can have default values. If you don't provide an argument for that parameter when calling the function, the default value is used.

intermediate

How do you call a function with multiple parameters using keyword arguments?

You specify the parameter names and values like function_name(a=5, b=10), which makes the call clearer and order-independent.

What is the correct way to define a function with three parameters named x, y, and z?

A def func[x, y, z]:

B def func(x y z):

C def func(x, y, z):

D def func(x; y; z):

In Python, parameters are separated by commas inside parentheses after the function name.

What will happen if you call a function defined as def add(a, b): with only one argument?

A It will cause an error because b is missing.

B It will ignore the missing argument and run anyway.

C It will run and use a default value for b.

D It will assign None to b automatically.

If a parameter has no default value, Python requires an argument for it when calling the function.

How can you call a function with parameters a and b by specifying the arguments in any order?

A Both C and D

B func(1, 2)

C func(b=2, a=1)

D func(a=1, b=2)

Using keyword arguments lets you specify parameters in any order by naming them.

Which of these is a valid function call if the function is defined as def greet(name, greeting='Hello'):?

A greet('Alice', 'Hi')

B All of the above

C greet(greeting='Hi', name='Alice')

D greet('Alice')

The function can be called with just the required parameter, with both parameters, or with keyword arguments in any order.

What is the output of this code?

def multiply(x, y):
    return x * y

print(multiply(3, 4))

A 7

B Error

C 34

D 12

The function multiplies 3 by 4 and returns 12, which is printed.

Explain how to define and call a Python function with multiple parameters, including an example.

Think about how you tell a friend to do something with two or more pieces of information.

Describe the difference between positional and keyword arguments when calling a function with multiple parameters.

Imagine giving directions by order or by naming each step.

Practice

1. What does it mean when a Python function has multiple parameters?
def greet(name, age):

easy

A. The function can only have one parameter at a time.

B. The function can only return multiple values.

C. The function must be called without any arguments.

D. The function can receive more than one piece of information to work with.

Solution

1. Step 1: Understand function parameters

   Parameters inside parentheses let a function accept inputs to use inside its code.

2. Step 2: Multiple parameters mean multiple inputs

   When separated by commas, each parameter is a separate input the function expects.

3. Final Answer:

   The function can receive more than one piece of information to work with. -> Option D

4. Quick Check:

   Multiple parameters = multiple inputs [OK]

Hint: Multiple parameters mean multiple inputs separated by commas [OK]

Common Mistakes:

• Thinking parameters are outputs
• Believing functions can't have more than one parameter
• Confusing parameters with function return values

2. Which of the following is the correct way to define a function with two parameters named x and y?

easy

A. def add(x; y):

B. def add(x y):

C. def add(x, y):

D. def add[x, y]:

Solution

1. Step 1: Check function definition syntax

   Python functions use parentheses to list parameters separated by commas.

2. Step 2: Identify correct separator and brackets

   Parameters must be separated by commas inside parentheses, not spaces, semicolons, or brackets.

3. Final Answer:

   def add(x, y): -> Option C

4. Quick Check:

   Parameters separated by commas inside () [OK]

Hint: Use commas between parameters inside parentheses [OK]

Common Mistakes:

• Using spaces instead of commas
• Using semicolons or brackets instead of commas and parentheses
• Missing parentheses around parameters

3. What will be the output of this code?

def multiply(a, b):
    return a * b

result = multiply(3, 4)
print(result)

medium

A. 12

B. 7

C. 34

D. Error

Solution

1. Step 1: Understand function call with parameters

   The function multiply receives 3 and 4 as inputs for a and b.

2. Step 2: Calculate the return value

   It returns the product 3 * 4 = 12, which is stored in result and printed.

3. Final Answer:

   12 -> Option A

4. Quick Check:

   3 times 4 equals 12 [OK]

Hint: Multiply inputs given to function parameters [OK]

Common Mistakes:

• Adding instead of multiplying
• Concatenating numbers as strings
• Expecting an error due to parameters

4. Find the error in this function definition:

def greet(name, age)
    print(f"Hello {name}, you are {age} years old.")

medium

A. Missing colon at the end of the function header.

B. Parameters should be inside square brackets.

C. The print statement should be outside the function.

D. Function name cannot be 'greet'.

Solution

1. Step 1: Check function header syntax

   Python requires a colon ':' at the end of the function header line.

2. Step 2: Identify missing colon

   The given function header lacks the colon after the closing parenthesis.

3. Final Answer:

   Missing colon at the end of the function header. -> Option A

4. Quick Check:

   Function header must end with ':' [OK]

Hint: Always put ':' after function header parentheses [OK]

Common Mistakes:

• Forgetting the colon ':'
• Using wrong brackets for parameters
• Misplacing print statement

5. You want to write a function describe_person that takes name, age, and city as parameters and returns a sentence like:
"Alice is 30 years old and lives in Paris."
Which function definition and return statement is correct?

hard

A. def describe_person(name, age, city):
print(f"{name} is {age} years old and lives in {city}.")

B. def describe_person(name, age, city):
return f"{name} is {age} years old and lives in {city}."

C. def describe_person(name, age, city):
return name + " is " + age + " years old and lives in " + city + "."

D. def describe_person(name, age, city):
return f"{name} is {age} years old lives in {city}."

Solution

1. Step 1: Check function parameters and string formatting

   The function must accept three parameters and return a formatted string with all parts included.

2. Step 2: Compare return statements

   def describe_person(name, age, city): return f"{name} is {age} years old and lives in {city}." uses an f-string correctly with all parts and punctuation. def describe_person(name, age, city): return name + " is " + age + " years old and lives in " + city + "." tries string addition but age is an int, causing error. def describe_person(name, age, city): print(f"{name} is {age} years old and lives in {city}.") prints instead of returning. def describe_person(name, age, city): return f"{name} is {age} years old lives in {city}." misses 'and' in the sentence.

3. Final Answer:

   def describe_person(name, age, city): return f"{name} is {age} years old and lives in {city}." -> Option B

4. Quick Check:

   Use f-string with all parameters and return [OK]

Hint: Use f-string with all parameters and return the string [OK]

Common Mistakes:

• Concatenating strings with int without conversion
• Using print instead of return
• Missing words or punctuation in the string