Barrier(parties[, action[, timeout]]) Create a shared threading.Barrier object and return a proxy for it. New in version 3.3.

compress(data) Provide data to the compressor object. Returns a chunk of compressed data if possible, or an empty byte string otherwise. When you have finished providing data to the compressor, call the flush() method to finish the compression process.

eof True if the end-of-stream marker has been reached. New in version 3.3.

TarInfo.tobuf(format=DEFAULT_FORMAT, encoding=ENCODING, errors='surrogateescape') Create a string buffer from a TarInfo object. For information on the arguments see the constructor of the TarFile class. Changed in version 3.2: Use 'surrogateescape' as the default for the errors argument.

os.defpath The default search path used by exec*p* and spawn*p* if the environment doesn’t have a 'PATH' key. Also available via os.path.

class ctypes.PyDLL(name, mode=DEFAULT_MODE, handle=None) Instances of this class behave like CDLL instances, except that the Python GIL is not released during the function call, and after the function execution the Python error flag is checked. If the error flag is set, a Python exception is raised. Thus, this is only useful to call Python C api functions directly.

statistics.stdev(data, xbar=None) Return the sample standard deviation (the square root of the sample variance). See variance() for arguments and other details. >>> stdev([1.5, 2.5, 2.5, 2.75, 3.25, 4.75]) 1.0810874155219827

base64.encode(input, output) Encode the contents of the binary input file and write the resulting base64 encoded data to the output file. input and output must be file objects. input will be read until input.read() returns an empty bytes object. encode() inserts a newline character (b'\n') after every 76 bytes of the output, as well as ensuring that the output always ends with a newline, as per RFC 2045 (MIME).

HMAC.digest_size The size of the resulting HMAC digest in bytes.

os.name The name of the operating system dependent module imported. The following names have currently been registered: 'posix', 'nt', 'ce', 'java'. See also sys.platform has a finer granularity. os.uname() gives system-dependent version information. The platform module provides detailed checks for the system’s identity.