I have both Python 2.7 and Python 3.4 installed on my MacBook, as both are needed sometimes. 

Python 2.7 is shipped by Apple itself.
Python 3.4 is installed by Mac OS X 64-bit/32-bit installer in the link
<https://www.python.org/downloads/release/python-343/>

Here is how I installed Meld on Mac OS X 10.10:

1. Install apple development command line tools;
2. Install Homebrew;
3. `homebrew install homebrew/x11/meld`
4. When launched meld, it says:

```
**bash: /usr/local/bin/meld: /usr/local/opt/python/bin/python2.7: bad interpreter: No such file or directory**

```

From my research, some people recommend to modify the first line in `/usr/local/bin/pip`, i.e.,

```none
#!/usr/local/opt/python/bin/python2.7

```

This file is missing. However, if I want to be able to use both Python 2.7 and Python 3.4 for Meld, what should I do to make it work?