with open(sys.argv[1], encoding='utf-8') as fp: for line_no, line in enumerate(fp, 1): for match in WORD_RE.finditer(line): word = match.group() column_no = match.start() + 1 location = (line_no, column_no) # this is ugly; coded like this to make a point occurrences ...
除了格式化方法(format 和 format_map)和几个处理 Unicode 数据的方法(包括casefold、isdecimal、isidentifier、isnumeric、isprintable 和 encode)之外,str 类型的其他方法都支持 bytes 和 bytearray 类型。这意味着,我们可以使用熟悉的字符串方法处理二进制序列,如 endswith、replace、strip、translate、upper等,只有少数...
注意 在这第二版中增加了 200 多页后,我将可选部分“集合和字典的内部”移至fluentpython.com伴随网站。更新和扩展的18 页文章包括关于以下内容的解释和图表: 哈希表算法和数据结构,从在set中的使用开始,这更容易理解。 保留dict实例中键插入顺序的内存优化(自 Python 3.6 起)。 用于保存实例属性的字典的键共享...
#inplace=False:对数据进行修改,创建并返回新的对象承载其修改结果。 food_info.sort_values("Sodium_(mg)", inplace=True) print(food_info["Sodium_(mg)"]) #从大到小排序 food_info.sort_values("Sodium_(mg)", inplace=True, ascending=False) print(food_info["Sodium_(mg)"]) 1. 2. 3. 4...
{ mapReduce: <collection>, map: <function>, reduce: <function>, finalize: <function>, out: , query: <document>, sort: <document>, limit: <number>, scope: <document>, jsMode: <boolean>, verbose: <boolean>, bypassDocumentValidation: <boolean>, collation: <document>, writeConcern: ...
使用Unicode Collation Algorithm 进行排序 James Tauber,多产的 Django 贡献者,一定感受到了痛苦,并创建了pyuca,这是 Unicode Collation Algorithm(UCA)的纯 Python 实现。示例 4-20 展示了它的易用性。 示例4-20。使用pyuca.Collator.sort_key方法
connect(**DB_INFO)# 初始化数据库连接# 执行SQL语句的增删改defexecute(self,sql):try:withself...
Sorting with the Unicode Collation Algorithm James Tauber, prolific Django contributor, must have felt the pain and created PyUCA, a pure-Python implementation of the Unicode Collation Algorithm (UCA). Example 4-20 shows how easy it is to use. Example 4-20. Using the pyuca.Collator.sort_key...
importfunctoolsdefmyfunc(a,b=2):"Docstring for myfunc()."print(' called myfunc with:',(a,b))defshow_details(name,f,is_partial=False):"Show details of a callable object."print('{}:'.format(name))print(' object:',f)ifnotis_partial:print(' __name__:',f.__name__)ifis_partial...
database = pymongo.MongoClient()['book'] collection = database['myWifeSoBeautifull'] result = collection.find().collation({"locale":"zh", "numericOrdering":True}).sort("isort") with open("list.txt", "a+", encoding="utf-8") as f: for i in result: f.writelines(i["isort"]+"...