python 2.7 / exec /有什么问题？

I have this code which runs fine in Python 2.5 but not in 2.7:

我有这个代码在Python 2.5中运行良好,但在2.7中没有:

import sys
import traceback
try:
    from io import StringIO
except:
    from StringIO import StringIO

def CaptureExec(stmt):
    oldio = (sys.stdin, sys.stdout, sys.stderr)
    sio = StringIO()
    sys.stdout = sys.stderr = sio
    try:
        exec(stmt, globals(), globals())
        out = sio.getvalue()
    except Exception, e:
        out = str(e) + "\n" + traceback.format_exc()
    sys.stdin, sys.stdout, sys.stderr = oldio
    return out

print "%s" % CaptureExec("""
import random
print "hello world"
""")

And I get:

我得到:

string argument expected, got 'str'
Traceback (most recent call last):
  File "D:\3.py", line 13, in CaptureExec
    exec(stmt, globals(), globals())
  File "", line 3, in 
TypeError: string argument expected, got 'str'

2 个解决方案

#1

io.StringIO is confusing in Python 2.7 because it's backported from the 3.x bytes/string world. This code gets the same error as yours:

io.StringIO在Python 2.7中令人困惑,因为它从3.x字节/字符串世界向后移植。此代码与您的错误相同:

from io import StringIO
sio = StringIO()
sio.write("Hello\n")

causes:

Traceback (most recent call last):
  File "so2.py", line 3, in <module>
    sio.write("Hello\n")
TypeError: string argument expected, got 'str'

If you are only using Python 2.x, then skip the io module altogether, and stick with StringIO. If you really want to use io, change your import to:

如果您只使用Python 2.x,则完全跳过io模块,并坚持使用StringIO。如果您确实想使用io,请将导入更改为:

from io import BytesIO as StringIO

2 个解决方案

#1

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