Please enable JavaScript.

Coggle requires JavaScript to display documents.

Python (syntax (complex (int, float, long, complex(J), conjugate), round…

- - - - :check:
  - - - import string remove_punctuation_map=dict((ord(char),None)for char in string.punctuation) s="I like python! I want to learn better." s_nopunctuation=s.translate(remove_punctuation_map)
  - - - :moneybag:r'(xx|yy|zz)'
        
        :raising_hand:xx/yy/zz都是字符串.因为本身在字符串里面,所以就是几个字母
        
        :explode:满足xx/yy/zz正则的都可以
    - - import re a=re.compile(xxx) a.findall('xxx')
  - - - 自动添加分号
      - :check:
  - - - sys.stdout.write('\r%d/%d'%(i,total))
  - - - c=chr(65)
    - - ascii=ord('A')
- - - - :explode::one:先写标准库,(一个空行), 后写第三方. :two:不要同时导入两个模块, 除非是一个模块的两个对象
      - import os import sys from subprocess import Popen, PIPE
    - - :explode:包和模块都用小写, 模块可以用下划线, 包不建议用下划线
- - - - :pencil2:判断字典是不是可迭代对象
        
        import collections isinstance({},collections.Iterable)
      - :explode:使用isinstance函数
  - - - :pencil2:将列表转换成迭代器
        
        a=iter([1,2,3])
    - - :pencil2:创建从0,1,2,迭代到9的迭代器
        
        a=(x for x in range(10))
      - :warning::one:含有yield都是生成器,所以也是迭代器 :two:如果是中括号包起来的话,就是列表,同时也是可迭代对象,小括号创建迭代器
  - - - import collections isinstance(a,collections.Iterator)
- - - - 复制引用
    - - copy.deepcopy
        
        开辟新空间+内部引用也开辟新空间
    - - 第一层开辟新空间
      - 第二层有引用也不开辟新空间
- - - - :explode:在ipython中导入pdb模块,然后用pdb.run("函数")来调试函数
      - :pencil2:调试求和函数
        
        pdb.run("get_sum(1,2)")
        
        :warning:注意用s进入函数先.否则l的话,会是eof(因为ipython的话是在行尾)
- - - - from urllib.request import * import random url="http://acupunctureschoolonline.com/wp-content/uploads/2012/09/OrrisRoot.jpg" # construct the request object ua_list=[ "Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.122 Safari/537.36 SE 2.X MetaSr 1.0", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.87 Safari/537.36 OPR/37.0.2178.32,", "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36", ] user_agent=random.choice(ua_list) headers={"User-Agent":user_agent} request=Request(url,headers=headers) # send a request response=urlopen(request)
- - - - :explode:远程连接到服务器的文件目录和python编译器,从而远程编程
- - - - /usr/bin/pip2 install -i https://pypi.tuna.tsinghua.edu.cn/simple numpy