如何在变量中获取python代码的python交互式shell输出？

Question

Suppose I have

code = '2+3'

I want to run this code in python interactive shell and get the output string in a variable. So the result of the execution of code would be stored in another variable called output

In this case, the output variable would be '5'.

So is there any way to do this?

def run_code(string):
    # execute the string
    return output # the string that is given by python interactive shell

!!! note:

  exec returns None and eval doesn't do my job

Suppose code = "print('hi')" output should be 'hi'

Suppose code = 'hi' output should be

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'hi' is not defined 

Answer 1

if you really must run strings as python code, you COULD spawn another python process with the subprocess.Popen function, specify stdout, stderr, stdin each to subprocess.PIPE and use the .communicate() function to retrieve the output.

python takes a -c argument to specify you're giving it python code as the next argument to execute/interpret.

IE python -c "print(5+5)" will output 10 to stdout

IE

proc = subprocess.Popen(["python", "-c", code], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
stdout, stderr = proc.communicate()
print(stdout.decode('utf-8'))

Answer 2

您正在寻找的函数是内置的python函数

eval(string)