直接从文件运行python方法/函数

Question

我想知道是否有一种方法可以直接从文件中直接运行python函数,只需在一行中提及文件后跟函数.

例如,假设我有一个带有' newfunction() ' 函数的文件' test.py '.

---------- ----------- test.py

def newfunction():
     print 'welcome'

我可以运行newfunction()做类似的事情.

  python test.py newfunction

我知道如何导入和调用函数等.在django etc(python manage.py runserver)中看到类似的命令,我觉得有一种方法可以直接调用这样的函数.如果可能的话,请告诉我.

我希望能够与django一起使用它.但是,适用于所有地方的答案都很棒.

Answer 1

尝试globals()和arguments (sys.argv)：

#coding:utf-8

import sys

def moo():
    print 'yewww! printing from "moo" function'

def foo():
    print 'yeeey! printing from "foo" function'

try:
    function = sys.argv[1]
    globals()[function]()
except IndexError:
    raise Exception("Please provide function name")
except KeyError:
    raise Exception("Function {} hasn't been found".format(function))

结果：

? python calling.py foo
yeeey! printing from "foo" function

? python calling.py moo
yewww! printing from "moo" function

? python calling.py something_else
Traceback (most recent call last):
  File "calling.py", line 18, in <module>
    raise Exception("Function {} hasn't been found".format(function))
Exception: Function something_else hasn't been found

? python calling.py
Traceback (most recent call last):
  File "calling.py", line 16, in <module>
    raise Exception("Please provide function name")
Exception: Please provide function name