How do you represent the subtraction of two strings in Python?

In Python, you cannot directly subtract strings from each other, but there are other methods you can use to achieve the effect of subtracting strings. Here are two commonly used methods:

Option 1: Use the replace() method to remove characters from the first string based on the second string. For example:

str1 = "abcdefg"
str2 = "def"
result = str1.replace(str2, "")
print(result)  # 输出结果为：abcg

Option 2: Iterate through each character of the second string using a loop, then remove that character from the first string using the replace() method. For example:

str1 = "abcdefg"
str2 = "def"
result = str1
for char in str2:
    result = result.replace(char, "")
print(result)  # 输出结果为：abcg

Both methods involve removing characters from the second string in order to obtain the final result in the first string. It is important to note that the subtraction here does not operate like mathematical subtraction, only indicating the removal of characters from the first string that appear in the second string.