bytearray.capitalize() Return a copy of the sequence with each byte interpreted as an ASCII character, and the first byte capitalized and the rest lowercased. Non-ASCII byte values are passed through unchanged. Note The bytearray version of this method does not operate in place - it always produces a new object, even if no changes were made.

sys.implementation An object containing information about the implementation of the currently running Python interpreter. The following attributes are required to exist in all Python implementations. name is the implementation’s identifier, e.g. 'cpython'. The actual string is defined by the Python implementation, but it is guaranteed to be lower case. version is a named tuple, in the same format as sys.version_info. It represents the version of the Python implementation. This has a distinct

winreg.CreateKey(key, sub_key) Creates or opens the specified key, returning a handle object. key is an already open key, or one of the predefined HKEY_* constants. sub_key is a string that names the key this method opens or creates. If key is one of the predefined keys, sub_key may be None. In that case, the handle returned is the same key handle passed in to the function. If the key already exists, this function opens the existing key. The return value is the handle of the opened key. If t

BaseHandler.http_error_default(req, fp, code, msg, hdrs) This method is not defined in BaseHandler, but subclasses should override it if they intend to provide a catch-all for otherwise unhandled HTTP errors. It will be called automatically by the OpenerDirector getting the error, and should not normally be called in other circumstances. req will be a Request object, fp will be a file-like object with the HTTP error body, code will be the three-digit code of the error, msg will be the user-v

add_header(name, value, **_params) Add a (possibly multi-valued) header, with optional MIME parameters specified via keyword arguments. name is the header field to add. Keyword arguments can be used to set MIME parameters for the header field. Each parameter must be a string or None. Underscores in parameter names are converted to dashes, since dashes are illegal in Python identifiers, but many MIME parameter names include dashes. If the parameter value is a string, it is added to the header

delete(*items) Delete all specified items and all their descendants. The root item may not be deleted.

sysconfig.get_platform() Return a string that identifies the current platform. This is used mainly to distinguish platform-specific build directories and platform-specific built distributions. Typically includes the OS name and version and the architecture (as supplied by os.uname()), although the exact information included depends on the OS; e.g. for IRIX the architecture isn’t particularly important (IRIX only runs on SGI hardware), but for Linux the kernel version isn’t particularly impor

class importlib.util.LazyLoader(loader) A class which postpones the execution of the loader of a module until the module has an attribute accessed. This class only works with loaders that define exec_module() as control over what module type is used for the module is required. For those same reasons, the loader’s create_module() method will be ignored (i.e., the loader’s method should only return None; this excludes BuiltinImporter and ExtensionFileLoader). Finally, modules which substitute

compileall.compile_dir(dir, maxlevels=10, ddir=None, force=False, rx=None, quiet=0, legacy=False, optimize=-1, workers=1) Recursively descend the directory tree named by dir, compiling all .py files along the way. The maxlevels parameter is used to limit the depth of the recursion; it defaults to 10. If ddir is given, it is prepended to the path to each file being compiled for use in compilation time tracebacks, and is also compiled in to the byte-code file, where it will be used in tracebac

exception http.client.CannotSendHeader A subclass of ImproperConnectionState.