小编Gre*_*war的帖子

为什么以下python3代码会产生错误？

a='''
def x():
  print(42)
'''

class Test:
    def __init__(self):
        exec(a)
        x()

t = Test()

结果在此消息中:

Traceback (most recent call last):
  File "bug.py", line 11, in <module>
    t = Test()
  File "bug.py", line 9, in __init__
    x()
NameError: global name 'x' is not defined