如何在Python中执行包含Python代码的字符串? [英] How do I execute a string containing Python code in Python?

问题描述

如何在Python中执行包含Python代码的字符串?

How do I execute a string containing Python code in Python?

推荐答案

在该示例中，使用exec函数将字符串作为代码执行.

In the example a string is executed as code using the exec function.

import sys
import StringIO

# create file-like string to capture output
codeOut = StringIO.StringIO()
codeErr = StringIO.StringIO()

code = """
def f(x):
    x = x + 1
    return x

print 'This is my output.'
"""

# capture output and errors
sys.stdout = codeOut
sys.stderr = codeErr

exec code

# restore stdout and stderr
sys.stdout = sys.__stdout__
sys.stderr = sys.__stderr__

print f(4)

s = codeErr.getvalue()

print "error:\n%s\n" % s

s = codeOut.getvalue()

print "output:\n%s" % s

codeOut.close()
codeErr.close()

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