Python: read and execute lines from other script (or copy them in)?
Question: Consider a python script:

    
    
    ####
    #Do some stuff#
    
    ####
    #Do stuff from separate file
    
    ####
    #Do other stuff
    

What it the best way to implement the middle bit (do stuff that is defined in
another file)? I've been told that in C++ there's a command that can achieve
what I'm looking to do. Is there an equivalent in Python?

e.g. if A.py is:

    
    
    print 'a'
    
    ### import contents of other file here
    
    print 'm'
    

and B.py is:

    
    
    print 'b'
    print 'c'
    print 'd'
    

then the desired output of A.py is:

    
    
    a
    b
    c
    d
    m
    

B.py won't actually contain print statements, rather variable assignments and
simple flow control that won't conflict with anything declared or defined in
A.py. I understand that I could put the contents of B.py into a function,
import this into A.py and call this function at the desired place. That would
be fine if I wanted the contents of B.py to return some single value. But the
contents of B.py may contain for example twenty variable assignments.

I guess then what I am really looking to do is not so much execute the
contents of B.py within A.py, but moreover dynamically modify A.Py to contain,
at some desired line in A.py, the contents of B.py. Then, obviously, execute
the updated A.py.

Thoughts and tips much appreciated.


Answer: I don't think this is a good programming practice but you can use
[execfile](http://docs.python.org/2/library/functions.html#execfile) to
execute all the code in another file.

    
    
    #a.py
    a = a + 5
    
    #b.py
    a = 10
    execfile("a.py")
    print a 
    

If you run `b.py` it will print '15'.

