Recording the Way

csv.reader(csvfile, dialect=’excel’, *\fmtparams*)If csvfile is a file object, it should be opened with newline=''. A short usage example: 12345import csvwith open('eggs.csv', newline='') as csvfile: spamreader = csv.reader(csvfile, delimiter=' ', quotechar='|') for row in spamreade...

Python爬虫较为常用的较冷门的PackagesCacheControlCacheControl is a port of the caching algorithms in httplib2 for use with the requests session object. It was written because httplib2’s better support for caching is often mitigated by its lack of thread-safety. The same is true of requests in terms of cachin...

'.' (Dot.) 表示除换行符意外的所有符号。 '$' 本质上来说，代表换行符，为本行的换行符。 '^' (Caret.)本质上来说也可以表示换行符，只不过是上一行的换行符。 '?' 表示其前面的字符出现一次或者没有出现。 *?, +?, ?? The '*', '+', and '?'会匹配尽可能多的匹配想，而*?, +?, ??一旦发现匹配项即立即终止匹配。 {m,n}? 同上。 '\' 转义符，消除紧连其后符号的特殊意义，只表示符号本身。 [] Spe...

12345678replacement_field ::= “{” [field_name] [“!” conversion] [“:” format_spec] “}”field_name ::= arg_name (“.” attribute_name | “[” element_index “]”)*arg_name ::= [identifier | integer]attribute_name ::= identifierelement_index ::= integer | index_stringi...

Request123456Request = Request-Line *(( general-header | request-header | entity-header ) CRLF) CRLF [ message-body ] Request-Line1Request-Li...

Xpath test bed(链接地址)Test queries in the Xpath test bed:Xpath test bed (whitebeam.org) Browser console1$x('//div') Works in Firefox and Chrome. SelectorsDescendant selectors h1 //h1 ? div p //div//p ? ul > li //ul/li ? ul > li > a //ul/li/a div > * //div/* :ro...

Exiting(链接地址) :qa Close all files :qa! Close all files, abandon changes :w Save :wq / :x Save and close file :q Close file :q! Close file, abandon changes ZZ Save and quit ZQ Quit without checking changes Navigating h j k l Arrow keys <C-U> / <C-D> Page up/p...

Path 句法(URL)： Syntax Meaning tag Selects all child elements with the given tag. For example, spam selects all child elements named spam, and spam/egg selects all grandchildren named egg in all children named spam. * Selects all child elements. For example, */egg selects all grandchildren ...

转载地址： Shashank Tiwari Atom is a beautiful and customizable editor that can be leveraged gainfully for Python programming. Built on Electron, a technology for building cross platform desktop apps with JavaScript, HTML, and CSS, Atom is, as Github says, “hackable”. Its support for plugins and add-o...

Code example: 123456789101112131415161718192021222324252627class Vehicle(object): """Docstring""" def __init__(self, color, doors, tires, vtype): """Constructor""" self.color = color self.doors = doors self.tires = tires self.vtype = vtype def brake(...