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1. 全局替换字符串 %s#old string#new string#g

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import string
import random


# python 3.6.1以下
text = ''.join(random.choice(string.ascii_letters + string.digits) for _ in range(15))
print(text)

# python 3.6.1
text = ''.join(random.choices(string.ascii_letters + string.digits, k=15))

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from difflib import SequenceMatcher

def similar(a, b):
    return SequenceMatcher(None, a, b).ratio()

"""
>>> similar("Apple","Appel")
0.8
>>> similar("Apple","Mango")
0.0

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from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import *
# 打开文件对话框， 
filename, filetype = QFileDialog.getOpenFileName(None, '选择文件', "", filter="txt (*.txt)")

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import concurrent.futures
import urllib.request

URLS = ['http://www.163.com/',
        'http://www.qq.com/',
        'http://www.baidu.com/',
        'http://www.v2ex.com/',
        'http://www.360.com']

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import concurrent.futures
import math

PRIMES = [
    112272535095293,
    112582705942171,
    112272535095293,
    115280095190773,
    115797848077099,
    1099726899285419]

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"""
多进程示例
"""
import time
from multiprocessing import Pool


def run(fn):
    time.sleep(1)
    print(fn)

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ALPHABET = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"


def base62_encode(num, alphabet=ALPHABET):
    """Encode a number in Base X

    `num`: The number to encode
    `alphabet`: The alphabet to use for encoding
    """
    if (num == 0):

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.IO;

namespace ConsoleApp1
{

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def chunked(iterable, n):
    from itertools import islice
    from functools import partial

    def take(n, iterable):
        return list(islice(iterable, n))

    return iter(partial(take, n, iter(iterable)), [])