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How do I execute a string containing Python code in Python?
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String find() in Python Just call the method on the string object to search for a string, like so: obj. find(“search”). The find() method searches for a query string and returns the character position if found. If the string is not found, it returns -1.
Python code is translated into intermediate code, which has to be executed by a virtual machine, known as the PVM, the Python Virtual Machine. This is a similar approach to the one taken by Java. There is even a way of translating Python programs into Java byte code for the Java Virtual Machine (JVM).
For statements, use exec(string) (Python 2/3) or exec string (Python 2):
>>> mycode = 'print "hello world"' >>> exec(mycode) Hello world When you need the value of an expression, use eval(string):
>>> x = eval("2+2") >>> x 4 However, the first step should be to ask yourself if you really need to. Executing code should generally be the position of last resort: It's slow, ugly and dangerous if it can contain user-entered code. You should always look at alternatives first, such as higher order functions, to see if these can better meet your needs.
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