Python: Count the number of arguments in a given function

Last update on April 17 2025 13:05:27 (UTC/GMT +8 hours)

Function Argument Counter

Write a Python program to count the number of arguments in a given function.

Sample Solution:

Python Code:

# Define a function named num_of_args that takes a variable number of arguments (*args).
def num_of_args(*args):
    # Return the number of arguments passed to the function using the len() function.
    return(len(args))

# Test the function with different numbers of arguments and print the results.

# Test case 1: No arguments
print(num_of_args())          # Expecting 0

# Test case 2: One argument
print(num_of_args(1))         # Expecting 1

# Test case 3: Two arguments
print(num_of_args(1, 2))      # Expecting 2

# Test case 4: Three arguments
print(num_of_args(1, 2, 3))   # Expecting 3

# Test case 5: Four arguments
print(num_of_args(1, 2, 3, 4)) # Expecting 4

# Test case 6: One argument (a list)
print(num_of_args([1, 2, 3, 4])) # Expecting 1 (the list is considered a single argument)

Sample Output:

0
1
2
3
4
1

Explanation:

Here is a breakdown of the above Python code:

• Function definition:
• The code defines a function named "num_of_args()" that takes a variable number of arguments (*args).
• Return Statement:
• The function returns the number of arguments passed to it using the "len()" function.
• Test cases:
• The function is tested with different numbers and types of arguments using print(num_of_args(...)).

Visual Presentation:

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Python program to count the number of arguments a function accepts using introspection.
• Write a Python program to determine both the default and non-default argument counts of a given function.
• Write a Python program to inspect a function’s signature and return the total number of parameters.
• Write a Python program to utilize the inspect module to retrieve and count the arguments of a function.

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