Encode a sequence of two-element tuples or dictionary into a URL query string.

If any values in the query arg are sequences and doseq is true, each
sequence element is converted to a separate parameter.

If the query arg is a sequence of two-element tuples, the order of the
parameters in the output will match the order of parameters in the
input.

quote('abc def') -> 'abc%20def'

Each part of a URL, e.g. the path info, the query, etc., has a
different set of reserved characters that must be quoted.

RFC 2396 Uniform Resource Identifiers (URI): Generic Syntax lists
the following reserved characters.

reserved    = ";" | "/" | "?" | ":" | "@" | "&" | "=" | "+" |
              "$" | ","(more...)

unquote('abc%20def') -> 'abc def'.

Create a file-like object for the specified URL to read from.

No Document.

Quote the query fragment of a URL; replacing ' ' with '+'

No Document.

No Document.

class to add info() and geturl() methods to an open file.

splittype('type:opaquestring') --> 'type', 'opaquestring'.

unquote('%7e/abc+def') -> '~/abc def'

Derived class with handlers for errors we can handle (perhaps).

OS-specific conversion from a file system path to a relative URL
of the 'file' scheme; not recommended for general use.

OS-specific conversion from a relative URL of the 'file' scheme
to a file system path; not recommended for general use.

splithost('//host[:port]/path') --> 'host[:port]', '/path'.

splituser('user[:passwd]@host[:port]') --> 'user[:passwd]', 'host[:port]'.

splitport('host:port') --> 'host', 'port'.

Join a base URL and a possibly relative URL to form an absolute
interpretation of the latter.

Class used by open_ftp() for cache of open FTP connections.

splitpasswd('user:passwd') -> 'user', 'passwd'.