s={'mike':150, 'allice':180,'bob':200} s['lili'] # 报错 print(s.get('lili')) # 输出 None , 不报错 1. 2. 3. 4. 实例 x=['boy','girl'];y=[30,25] #两个list z=dict(zip(x,y)) # 利用两个list 生成字典 zip()返回zip对象 print(z) # {'boy': 30, 'girl': 25} p...
test_dict = {"apple": 1, "pen": 3} print(f'isinstance(1, int): {isinstance(1, int)}') print(f'isinstance("123", str): {isinstance("123", str)}') print(f'isinstance(3.14, float): {isinstance(3.14, float)}') print(f'isinstance([1, 2, 3], list): {isinstance([1, 2, ...
# 需要导入模块: from ij.measure import ResultsTable [as 别名]# 或者: from ij.measure.ResultsTable importgetRowAsString[as 别名]def__localwand(self, x, y, ip, seuil, method, light):self.__image.killRoi() ip.snapshot()ifmethod =="mean": peak=ip.getPixel(x,y) tol = (peak - sel...
1$ Python --help2usage: Python [option] ... [-c cmd | -m mod | file | -] [arg] ...3Optionsandarguments (andcorresponding environment variables):4-B : don't write .py[co] files on import; also PYTHONDONTWRITEBYTECODE=x5-c cmd : program passedinas string (terminates option list...
tab-separated words 298 def rsplit(s, sep=None, maxsplit=-1): 299 """rsplit(s [,sep [,maxsplit]]) -> list of strings 300 301 Return a list of the words in the string s, using sep as the 302 delimiter string, starting at the end of the string and working 303 to the front...
299. Return a list of the words in the string s, using sep as the 300. delimiter string, starting at the end of the string and working 301. to the front. If maxsplit is given, at most maxsplit splits are 302. done. If sep is not specified or is None, any whitespace string ...
字符串:string "你好,python" 列表: list [1,2,3] 元组: tuple (1,2,3) 字典: dict {a:1} 集合: set {1,2,3,4} 4、常量 常量名大写,常量的值始终不变 MAX = 5000 5、关键字 6、同时给多个变量赋值 x,y,z=1,2,3 7、注释:
| S.__format__(format_spec) - > string | | Return a formatted version of S as described by format_spec. | | __ge__(...) | x.__ge__(y) < = = > x> = y | | __getattribute__(...) | x.__getattribute__( 'name' ) < = = > x.name ...
'b':('string',u'Unicodestring'), 代码语言:txt 复制 'c':None} 代码语言:txt 复制 selfref_list=[1,2,3] 代码语言:txt 复制 selfref_list.append(selfref_list) 代码语言:txt 复制 output=open('data.pkl','wb') 代码语言:txt 复制
在刚才解析出的html文本中,查找出id="live-list-contentbox"的标签,并且获取所有的标签内容 # 查询ul标签 host_infos = html_tree.find("ul", {"id": "live-list-contentbox"}) # print host_infos # 查询所有li标签 host_list = host_infos.find_all("li") print host_list # 遍历获取直播信息 for...