もちろん、任意の寸法の任意の材料のブロックの重量を計算するPython関数を更新しました：

``` 
import numpy as np

# Define a dictionary of materials and their densities in g/cm^3
MATERIAL_DENSITIES = {
    'ice': 0.92,
    'iron': 7.87,
    'aluminum': 2.7,
    'gold': 19.3,
    'lead': 11.3,
}

def calculate_block_weight(length, width, height, material):
    # Check if the material is a string or a float
    if isinstance(material, str):
        try:
            density = MATERIAL_DENSITIES[material.lower()]
        except KeyError:
            raise ValueError(f"Invalid material: {material}")
    elif isinstance(material, (int, float)):
        if material <= 0:
            raise ValueError("Density must be a positive number")
        density = material
    else:
        raise TypeError("Material must be a string or a number")

    # Convert dimensions to metric units
    length_cm = length * 30.48
    width_cm = width * 30.48
    height_cm = height * 2.54

    # Calculate volume and weight
    volume_cm = length_cm * width_cm * height_cm
    weight_grams = density * volume_cm
    weight_pounds = weight_grams / 453.592

    return weight_pounds
```
この関数の使い方は以下の通りです：

``` 
# Calculate weight of an ice block
weight = calculate_block_weight(18, 12, 1, 'ice')
print(f"The ice block weighs {round(weight, 2)} pounds")

# Calculate weight of a gold block with custom dimensions and density
weight = calculate_block_weight(10, 5, 3, 19.3)
print(f"The gold block weighs {round(weight, 2)} pounds")
```
この関数は、ブロックの長さ、幅、高さをフィート単位で、材質を文字列または密度をg/cm^3単位で表す浮動小数点数で指定します。この関数は寸法をメートル単位に変換し、与えられた密度を用いて体積と重量を計算します。そして重量をグラムからポンドに変換し、その結果を返します。材料が文字列の場合、MATERIAL_DENSITIES辞書で密度を検索し、材料が見つからない場合はValueErrorを発生させます。材料がfloatの場合、密度が正であるかどうかをチェックします。
Sure, here's an updated Python function that calculates the weight of a block of any material with any dimensions:

``` 
import numpy as np

# Define a dictionary of materials and their densities in g/cm^3
MATERIAL_DENSITIES = {
    'ice': 0.92,
    'iron': 7.87,
    'aluminum': 2.7,
    'gold': 19.3,
    'lead': 11.3,
}

def calculate_block_weight(length, width, height, material):
    # Check if the material is a string or a float
    if isinstance(material, str):
        try:
            density = MATERIAL_DENSITIES[material.lower()]
        except KeyError:
            raise ValueError(f"Invalid material: {material}")
    elif isinstance(material, (int, float)):
        if material <= 0:
            raise ValueError("Density must be a positive number")
        density = material
    else:
        raise TypeError("Material must be a string or a number")

    # Convert dimensions to metric units
    length_cm = length * 30.48
    width_cm = width * 30.48
    height_cm = height * 2.54

    # Calculate volume and weight
    volume_cm = length_cm * width_cm * height_cm
    weight_grams = density * volume_cm
    weight_pounds = weight_grams / 453.592

    return weight_pounds
``` 
Here's how to use the function:

``` 
# Calculate weight of an ice block
weight = calculate_block_weight(18, 12, 1, 'ice')
print(f"The ice block weighs {round(weight, 2)} pounds")

# Calculate weight of a gold block with custom dimensions and density
weight = calculate_block_weight(10, 5, 3, 19.3)
print(f"The gold block weighs {round(weight, 2)} pounds")
``` 
The function takes the length, width, and height of the block in feet, and the material as either a string or a float representing the density in g/cm^3. The function converts the dimensions to metric units and calculates the volume and weight using the given density. It then converts the weight from grams to pounds and returns the result. If the material is a string, it looks up the density in the MATERIAL_DENSITIES dictionary, raising a ValueError if the material is not found. If the material is a float, it checks that the density is positive.