How to execute a statement which was a string initially

Question

My question is about how to make the compiler treats my string as an executable statement, consider my string mystr='1+2+3', now the question is what's the code to put in function func so when I execute the following command func(mystr) I get 6 on my screen.

score 3 · Answer 1 · 2017-09-01T15:27:04.580

3

Using exec() for more than just expression strings:

def func(mystr):
    exec(mystr)

func("mystr='1+2+3';print(mystr)")

edited Sep 01 '17 at 15:27

answered Sep 01 '17 at 15:22

What's the difference between eval() and exec()? – francisco sollima Sep 01 '17 at 15:24
@franciscosollima [exec()](https://docs.python.org/3/library/functions.html#exec) take any Python code (sentences) while [eval()](https://docs.python.org/3/library/functions.html#eval) just expressions. The doc linked is clear ;) – Sep 01 '17 at 15:28

score 0 · Accepted Answer · answered Sep 01 '17 at 15:22

0

eval(mystr).

Documentation here.

answered Sep 01 '17 at 15:22

Karl Reid

2,147
1
10
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score 0 · Answer 3 · answered Sep 01 '17 at 15:23

0

You can use eval(mystr).

 print eval('1+2+3')

gives you 6

answered Sep 01 '17 at 15:23

sxzhangzsx

65
9

How to execute a statement which was a string initially

3 Answers3