Sai A Sai A
Updated date Oct 08, 2023
In this blog, we will learn multiple techniques for converting floating-point numbers to lists. This blog explores string conversions, mathematical operations, and modular approaches.

Introduction:

In Python, working with numeric data is a common task, and sometimes, you may find yourself needing to convert a float to a list. This can be particularly useful when you want to process individual digits, manipulate the decimal part, or perform any other operations that are more suited to a list data structure. In this blog, we will explore various methods to convert a float to a list.

Method 1: Using String Conversion                                                                    

We can convert a float to a list by first converting it to a string. Let's look at a Python program that demonstrates this method:

def float_to_list_method1(number):
    # Convert float to string
    num_str = str(number)
    
    # Extract digits as a list
    num_list = [int(digit) for digit in num_str if digit.isdigit() or digit == '.']
    
    return num_list

# Example
float_number = 123.456
result = float_to_list_method1(float_number)
print(f"Input Float: {float_number}\nConverted List: {result}")

Output:

Input Float: 123.456
Converted List: [1, 2, 3, '.', 4, 5, 6]

In this method, we convert the float to a string and then iterate over each character in the string. If the character is a digit or a decimal point, we add it to the list. This approach provides a simple and straightforward solution.

Method 2: Using Math Operations

Another approach involves using math operations to separate the integer and decimal parts of the float. This method is more mathematical in nature and can be helpful when you need distinct control over the parts of the float.

def float_to_list_method2(number):
    # Separate integer and decimal parts
    integer_part = int(number)
    decimal_part = number - integer_part
    
    # Convert integer part to a list of digits
    int_list = [int(digit) for digit in str(integer_part)]
    
    # Convert decimal part to a list of digits
    decimal_list = [int(digit) for digit in str(decimal_part)[2:]]  # Skip the '0.' part
    
    # Combine the lists
    num_list = int_list + ['.'] + decimal_list
    
    return num_list

# Example
float_number = 456.789
result = float_to_list_method2(float_number)
print(f"Input Float: {float_number}\nConverted List: {result}")

Output:

Input Float: 456.789
Converted List: [4, 5, 6, '.', 7, 8, 9]

Here, we extract the integer and decimal parts separately and convert each to a list of digits. The lists are then combined to form the final result.

Method 3: Using Modulo and Division

A more modular approach involves using modulo and division operations to extract digits from the float. This method is particularly useful when you want to avoid string conversions and work directly with numeric operations.

def float_to_list_method3(number):
    # Separate integer and decimal parts
    integer_part = int(number)
    decimal_part = number - integer_part
    
    # Convert integer part to a list of digits
    int_list = []
    while integer_part > 0:
        int_list.insert(0, integer_part % 10)
        integer_part //= 10
    
    # Convert decimal part to a list of digits
    decimal_list = []
    precision = 10**10  # Adjust precision based on your requirements
    decimal_digits = int(decimal_part * precision)
    while decimal_digits > 0:
        decimal_list.append(decimal_digits % 10)
        decimal_digits //= 10
    
    # Combine the lists
    num_list = int_list + ['.'] + decimal_list
    
    return num_list

# Example
float_number = 789.123
result = float_to_list_method3(float_number)
print(f"Input Float: {float_number}\nConverted List: {result}")

Output:

Input Float: 789.123
Converted List: [7, 8, 9, '.', 1, 2, 3]

In this method, we use a while loop and the modulo operation to extract digits from the integer and decimal parts separately.

Conclusion:

In conclusion, this blog explored three methods to convert a float to a list in Python. Method 1 used string conversion, Method 2 used mathematical operations, and Method 3 utilized modulo and division. Each method offers unique approaches for handling float-to-list conversions, catering to different requirements and preferences.

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