Python eval() Function:
In Python, eval() is a built-in function that evaluates the expression passed to it as a string and returns the result. It takes a single argument, which is the string to be evaluated.
Here's an example:
python
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expression = "2 + 2"
result = eval(expression)
print(result) # Output: 4
In this example, the string "2 + 2" is evaluated using eval(), and the result, which is the integer 4, is assigned to the variable result.
While eval() can be a powerful tool, it can also be dangerous if used incorrectly. It is capable of executing arbitrary code, so it should only be used with trusted input.
int() vs eval() in Python:
The int() function in Python is used to convert a string or a number to an integer. It takes a single argument, which is the string or number to be converted.
Here's an example:
python
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string_number = "123"
integer_number = int(string_number)
print(integer_number) # Output: 123
The main difference between int() and eval() is that int() only converts the input to an integer, whereas eval() evaluates the input as a Python expression.
Here's an example to demonstrate the difference:
python
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string_number = "123"
integer_number = int(string_number)
print(integer_number + 1) # Output: 124
expression = "123"
result = eval(expression)
print(result + 1) # Output: 124
In the first example, int() is used to convert the string "123" to the integer 123, which can then be used in a mathematical expression. In the second example, eval() is used to evaluate the string "123" as a Python expression, which also results in the integer 123.
However, eval() can also be used to execute arbitrary code, which can be a security risk if the input is not properly validated.
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3 окт 2024
