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()

Math Functions math.fabs() Python- Tutorials

Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

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compile(): compiles a source code string, a byte string, or an AST object into a code object

Using string object

Reading from file

Example

Using AST object

Subhendu Mohapatra