# get the HTTP/S status of a webpage async def get_status(url): # ...必须将 URL 解析为...
str1 = 'I am a unicode string' type(str1) # type(str1) => 'str' str2 = b"And I can't be concatenated to a byte string" type(str2) # type(str2) => 'bytes' str3 = str1 + str2 --- Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError...
In [6]: c1# bytearray 没有字面量句法Out[6]:bytearray(b'cafe') In [8]: c1[0]# 各个元素是 range(256) 的数字Out[8]:99In [7]: c1[-1:]# 切片是 bytearray 对象Out[7]:bytearray(b'e') my_bytes[0] 获取的是一个整数,而 my_bytes[:1] 返回的是一个长度为 1的 bytes 对象——...
file_bitcount_byte = f.read(4) # 得到每个像素占位大小 #下面就是将读取的字节转换成指定的类型 self.f_size,=struct.unpack('l',file_size_byte) self.f_ofset,=struct.unpack('l',file_ofset_byte) self.f_width,=struct.unpack('l',file_wide_byte) self.f_height,=struct.unpack('l',file_...
首先要知道,Python 内置了两种基本的二进制序列类型:Python 3 引入的不可变 bytes 类型和 Python 2.6 添加的可变bytearray 类型。(Python 2.6 也引入了 bytes 类型,但那只不过是 str 类型的别名,与Python 3 的 bytes 类型不同。) python3 str 是 Unicode字符,python2 str 是 字节序列 bytes 或 bytearray ...
These modules support various data models including document stores, key-value pairs, wide column stores, and graph databases, each optimized for specific use cases and scaling requirements. ModuleDatabase TypeMain Features pymongo Document Native BSON support, GridFS redis-py Key-Value Pipelining, pu...
二、广域网 广域网(Wide Area Network),简称WAN,是一种跨越大的、地域性的计算机网络的集合。 通常跨越省、市,甚至一个国家。广域网包括大大小小不同的子网,子网可以是局域网,也可以是小型的广域网。 三、局域网和广域网的区别 局域网是在某一区域内的,而广域网要跨越较大的地域,那么如何来界定这个区域呢...
In Python 3.12, comprehensions are inlined into the bytecode. Have a look at the disassembly of reverse_names() in the new version:Python >>> dis.dis(reverse_names) 1 0 RESUME 0 2 2 LOAD_FAST 0 (names) 4 GET_ITER 6 LOAD_FAST_AND_CLEAR 1 (name) 8 SWAP 2 10 BUILD_LIST 0 ...
In this quiz, you'll test your understanding of Python's bytearray data type. By working through this quiz, you'll revisit the key concepts and uses of bytearray in Python. Interactive Quiz Python's enumerate() Once you learn about for loops in Python, you know that using an index to...
getpass — Secure Password Prompt cmd — Line-oriented Command Processors shlex — Parse Shell-style Syntaxes configparser — Work with Configuration Files logging — Report Status, Error, and Informational Messages fileinput — Command-Line Filter Framework ...