compile() : Getting code object from AST or source String for execution by eval() or exec()

compile(source, filename, mode, flags=0, dont_inherit=False, optimize=-1)

source: String , byte or AST object
filename: file name
mode: exec for sequnce, eval for sequnce of statement , single for interactive statements

Returns code object for execution by exec() , eval() functions.

Using string object

cb=compile('print("Hello")', '', 'single')
exec(cb)  # Hello

Reading from file

Our sample.txt file

print('plus2net')

fob=open("D:\sample.txt",'r')
str=fob.read()
fob.close()
cb=compile(str,'sample.txt','single')
exec(cb)

Output

plus2net

Example

str="sum([1,2,3,4])"
cb=compile(str,'','single')
exec(cb)

Output

Using AST object

import ast
ast_obj = ast.parse("print('plus2net')")
code = compile(ast_obj, filename="", mode="exec")
exec(code)  # plus2net

Take precaution by not allowing un-cleaned code to get executed through exec(). There is a potential danger in allowing codes to get executed without proper check.

All Built in Functions in Python exec() eval()

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