Question

我有一些使用exec（）的python（2.7）代码：

import math

def some_function(a, b):
    return a+b

safe_dict = { 'Sqrt': math.sqrt, 'Smurf': some_function, "__builtins__": None }
with open('my_file.py') as f:
    exec(f.read(), safe_dict, {})

print('The End')

“ my_file.py”是：打印（“在执行脚本中”）

print('sqrt(2) = %f' % Sqrt(2)) # Call to math.sqrt     through name 'Sqrt'  given in globals
print('3+4 = %d' % Smurf(3, 4)) # Call to some_function through name 'Smurf' given in globals

def my_func(x):
    return Sqrt(2+x)
print("my_func: %f" % my_func(1))   # No problems

def my_func2(x, f):
    return f(x-1)
print("my_func2: %f" % my_func2(5, my_func))   # No problems too

def my_func3(x):
    return my_func(x-1) # Here, leads to a "NameError: global name 'my_func' is not defined" in the next line
print("my_func3: %f" % my_func3(5))

我不明白为什么在尝试调用my_func时my_func3中出现NameError。

为什么my_func3即使先前已定义也无法调用my_func？

有没有办法使其工作（不是在主模块中定义的my_func）？

修改错误是：

Traceback (most recent call last):
  File "main.py", line 9, in <module>
    exec(f.read(), safe_dict, {})
  File "<string>", line 16, in <module>
  File "<string>", line 15, in my_func3
NameError: global name 'my_func' is not defined

无法在exec（）环境中的函数内部调用函数

0 个答案: