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def gen_permutation(string):
    if len(string) == 1:
        yield string

    for char in string:
        rest = string.replace(char, "")
        for p_string in gen_permutation(rest):
            yield char + p_string

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# copy from easy_thumbnails
from PIL import Image, ImageChops

def is_transparent(image):
    """
    Check to see if an image is transparent.
    """
    if not isinstance(image, Image.Image):
        # Can only deal with PIL images, fall back to the assumption that that
        # it's not transparent.

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$(function(){

	var threadNames = [];
	$('th').each(function(i){
		threadNames.push($(this).html());
	});

	var style = document.createElement('style');
	style.type = 'text/css';
	style.innerHTML = "@media "+

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{
    "color_scheme": "Packages/Color Scheme - Default/Solarized (Dark).tmTheme",
    "font_size": 14,
    "ignored_packages":
    [
        "Vintage"
    ],
    "theme": "Spacegray.sublime-theme",
    "translate_tabs_to_spaces": true,
    "update_check": false,

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[
    { "keys": ["ctrl+d"], "command": "run_macro_file", "args": {"file": "res://Packages/Default/Delete Line.sublime-macro"} },
    { "keys": ["ctrl+up"], "command": "swap_line_up" },
    { "keys": ["ctrl+down"], "command": "swap_line_down" },
    { "keys": ["ctrl+alt+l"], "command": "beautify" },
]

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/**
    Usage:
    app.addRoute("/user/<userid>/", function(){
    console.log("userid:", this.userid);
    }).addRoute("/post/<postid>/", function(){
        console.log("postid:", this.postid);
    }).addRoute("/post/<postid>/comments", function(){
        console.log("comment of post");
    })
    app.startMain("/user/1/"); // >>> userid: 1

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.yue {
font: 400 18px/1.62 "Georgia", "Xin Gothic", "Hiragino Sans GB", "WenQuanYi Micro Hei", "Microsoft YaHei", "SimSun", sans-serif;
color: #333332;
}

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Redressed: [https://www.google.com/fonts/specimen/Redressed](https://www.google.com/fonts/specimen/Redressed)

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ngrok: https://ngrok.com/              # Introspected tunnels to localhost

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class Solution(object):
    def invertTree(self, root):
        """
        :type root: TreeNode
        :rtype: TreeNode
        """
        if root is None:
            return root
            
        if root.left: