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原创 python列表的骚操作1

list1 = ['你答错了','你答对了'][True]print(list1)

原创 python里格式化输出字符串

之前常用的两种形式为：#格式化输出字符串a, b = 5, 6print('%d * %d = %d'%(a, b, a*b))#字符串提供的方法来完成字符串的格式化a, b = 5, 6print('{0} * {1} = {2}'.format(a,b,a*b))python3.6以后有了更加简单的方式：a, b = 5, 6print(f'{a} + {b} =...

原创 python里多行缩进调整

多行向右：tab多行向左：shift+tab

原创 Jupyter notebook怎么显示行号

初学python时用Jupyter notebook很方便，让行号显示出来就更方便类菜单栏里 View——show line Numbers

原创 一行代码搞定部分网页文字无法copy

在原来url地址栏输入下面一行代码就可以右键复制了：javascript:void($={});

原创 pip安装：Fatal error in launcher: Unable to create process using '"d:\software\anaconda\python.exe"

可能是安装了python2 python3版本弄得有点乱，在pip install 时总是过不去，后来查到直接python -m pip install pyspider就OK啦

原创 leetcode 26:Remove Duplicates from Sorted Array

class Solution(object): def removeDuplicates(self, nums): """ :type nums: List[int] :rtype: int """ length = len(nums) k = 0 if length==0:...

原创 leetcode 18:4Sum

class Solution(object): def fourSum(self, nums, target): """ :type nums: List[int] :type target: int :rtype: List[List[int]] """ length = len(nums)...

原创 leetcode 16:3Sum Closest with python

import sysclass Solution(object): def threeSumClosest(self, nums, target): """ :type nums: List[int] :type target: int :rtype: int """ nums.sort()...

原创 leetcode 15:3Sum with Python

class Solution(object): def threeSum(self, nums): """ :type nums: List[int] :rtype: List[List[int]] """ length = len(nums) nums.sort() res ...

原创 Leetcode 11.Container With Most Water with Python

class Solution(object): def maxArea(self, height): """ :type height: List[int] :rtype: int """ length = len(height) if length == 2: ret...

原创 Leetcode 4.Median of Two Sorted Arrays with Python

class Solution(object): def findMedianSortedArrays(self, nums1, nums2): """ :type nums1: List[int] :type nums2: List[int] :rtype: float """ m = len...

原创 Vi/Vim 键盘图

原创 leetcode 867：Transpose Matrix

https://leetcode.com/problems/transpose-matrix/class Solution: def transpose(self, A): """ :type A: List[List[int]] :rtype: List[List[int]] """ return [[...

原创 leetcode 908:Smallest Range I

https://leetcode.com/problems/smallest-range-i/class Solution: def smallestRangeI(self, A, K): """ :type A: List[int] :type K: int :rtype: int """ ...

原创 leetcode 700:Search in a Binary Search

https://leetcode.com/problems/search-in-a-binary-search-tree/class Solution: def searchBST(self, root, val): """ :type root: TreeNode :type val: int :rtype: Tree...

原创 590. N-ary Tree Postorder Traversal

https://leetcode.com/problems/n-ary-tree-postorder-traversal/class Solution(object): def postorder(self, root): """ :type root: Node :rtype: List[int] """ ...

原创 589. N-ary Tree Preorder Traversal

https://leetcode.com/problems/n-ary-tree-preorder-traversclass Solution(object): def preorder(self, root): """ :type root: Node :rtype: List[int] """ res...

原创 mac os 下安装 chromedriver

去这里下载最新版本的chromedriver，前提是你的chrome也是最新的版本http://chromedriver.chromium.org/下载好了之后双击解压缩，然后在目录下打开命令行，执行$ mv chromedriver /usr/local/bin将chromedriver移动到bin目录里执行下面检验是否安装正确from selenium import...

原创 Mac OS下brew的安装和使用

打开终端执行以下命令/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" 

原创 Python leetcode 922:Sort Array By Parity II

https://leetcode.com/problems/sort-array-by-parity-ii/ class Solution(object): def sortArrayByParityII(self, A): """ :type A: List[int] :rtype: List[int] """ ...

原创 python leetcode 852.peak-index-in-a-mountain-array

https://leetcode.com/problems/peak-index-in-a-mountain-array/class Solution: def peakIndexInMountainArray(self, A): """ :type A: List[int] :rtype: int """ ...

原创 leetcode 728:Self Dividing Numbers with Python

https://leetcode.com/problems/self-dividing-numbers/class Solution: def selfDividingNumbers(self, left, right): """ :type left: int :type right: int :rtype: List...

原创 leetcode 561：Array Partition I with Python

https://leetcode.com/problems/array-partition-i/class Solution: def arrayPairSum(self, nums): """ :type nums: List[int] :rtype: int """ length = len(nums...

原创 leetcode 617:Merge Two Binary Tree with Python

https://leetcode.com/problems/merge-two-binary-trees class Solution: def mergeTrees(self, t1, t2): """ :type t1: TreeNode :type t2: TreeNode :rtype: TreeNode ...

原创 leetcode 832:Flipping an Image with Python

https://leetcode.com/problems/flipping-an-image/class Solution: def flipAndInvertImage(self, A): """ :type A: List[List[int]] :rtype: List[List[int]] """ ...

原创 leetcode 657:Robot Return to Origin with Python

https://leetcode.com/problems/robot-return-to-origin/class Solution: def judgeCircle(self, moves): """ :type moves: str :rtype: bool """ list1 = [0,0] ...

原创 leetcode 441:Hamming Distance with Python

https://leetcode.com/problems/hamming-distance/class Solution: def hammingDistance(self, x, y): """ :type x: int :type y: int :rtype: int """ ...

原创 leetcode 905:Sort Array By Parity with Python

https://leetcode.com/problems/sort-array-by-parity/class Solution: def sortArrayByParity(self, A): """ :type A: List[int] :rtype: List[int] """ B=A.copy(...

原创 leetcode 804:Submission Detail with Python

https://leetcode.com/problems/unique-morse-code-words/class Solution: def uniqueMorseRepresentations(self, words): """ :type words: List[str] :rtype: int """ ...

原创 leetcode 771:Jewels and Stones with Python

https://leetcode.com/problems/jewels-and-stones/class Solution: def numJewelsInStones(self, J, S): """ :type J: str :type S: str :rtype: int """ ...

原创 leetcode 821:Shortest Distance to a Character Python

https://leetcode.com/problems/shortest-distance-to-a-character/import mathclass Solution: def shortestToChar(self, S, C): """ :type S: str :type C: str :rtype: ...

原创 leetcode 766 Toeplitz Matrix Python

三年前刷过leetcode,今天开始决定闲来无事继续刷着玩，并且把答案传一下博客~问题描述就不写了，贴一下链接吧https://leetcode.com/problems/toeplitz-matrix/class Solution(object): def isToeplitzMatrix(self, matrix): """ :type mat...

原创 python collection.Counter() for leetcode 811 Subdomain Visit Count

在刷leetcode 811题时，单纯用字典去写会比较繁琐，看到答案里有人用到了collection模块中的Counter（）类，感觉so方便啊先贴上这个题的答案：class Solution(object): def subdomainVisits(self, cpdomains): """ :type cpdomains: List[str]...

原创 requests结合正则表达式爬取猫眼电影top100

import requestsimport reimport jsondef get_page(url): headers = {'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.92 Safari/537....

原创 正则表达式 ？P<name>

import re # 将匹配的数字乘以 2def double(matched): value = int(matched.group('value')) return str(value * 2) s = 'A23G4HFD567'print(re.sub('(?P&lt;value&gt;\d+)', double, s))?P&lt;value&gt;的意...

原创 python爬虫爬取淘宝商品的销量

代码使用过程中如果有任何问题，下方留言，我会及时解释回答；import reimport requestsimport jsondef openurl(keyword,page): params = {'q':keyword,'sort':'sale-desc','s':str(page*44)} 字典中第二项是按销量排序 headers = { 'us...

原创 python爬虫爬取网易云音乐的热门评论

import requestsimport jsonfrom bs4 import BeautifulSoupdef get_comments(res): comments = json.loads(res.text) hot_comments = comments['hotComments'] with open('热门评论.txt','w',encoding=...

原创 爬虫爬取豆瓣Top250电影 生成本地.txt文件

import requestsfrom bs4 import BeautifulSoup#request 豆瓣url，修改一下headersdef open_url(url): headers = { 'user-agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, lik...

原创 ImportError: No module named 'django.core.urlresolvers'

Django 2.0 把原来的 django.core.urlresolvers 包改为了 django.urls包，所以需要把原来的from django.core.urlresolvers import reverse 改为 from django.urls import reverse