itertools.filterfalse(predicate, iterable) Make an iterator that filters elements from iterable returning only those for which the predicate is False. If predicate is None, return the items that are false. Roughly equivalent to: def filterfalse(predicate, iterable): # filterfalse(lambda x: x%2, range(10)) --> 0 2 4 6 8 if predicate is None: predicate = bool for x in iterable: if not predicate(x): yield x

turtle.sety(y) Parameters: y – a number (integer or float) Set the turtle’s second coordinate to y, leave first coordinate unchanged. >>> turtle.position() (0.00,40.00) >>> turtle.sety(-10) >>> turtle.position() (0.00,-10.00)

pkgutil.walk_packages(path=None, prefix='', onerror=None) Yields (module_finder, name, ispkg) for all modules recursively on path, or, if path is None, all accessible modules. path should be either None or a list of paths to look for modules in. prefix is a string to output on the front of every module name on output. Note that this function must import all packages (not all modules!) on the given path, in order to access the __path__ attribute to find submodules. onerror is a function which

nntplib.decode_header(header_str) Decode a header value, un-escaping any escaped non-ASCII characters. header_str must be a str object. The unescaped value is returned. Using this function is recommended to display some headers in a human readable form: >>> decode_header("Some subject") 'Some subject' >>> decode_header("=?ISO-8859-15?Q?D=E9buter_en_Python?=") 'Débuter en Python' >>> decode_header("Re: =?UTF-8?B?cHJvYmzDqG1lIGRlIG1hdHJpY2U=?=") 'Re: problème de matr

sys.getallocatedblocks() Return the number of memory blocks currently allocated by the interpreter, regardless of their size. This function is mainly useful for tracking and debugging memory leaks. Because of the interpreter’s internal caches, the result can vary from call to call; you may have to call _clear_type_cache() and gc.collect() to get more predictable results. If a Python build or implementation cannot reasonably compute this information, getallocatedblocks() is allowed to return

operator.truth(obj) Return True if obj is true, and False otherwise. This is equivalent to using the bool constructor.

IMAP4.partial(message_num, message_part, start, length) Fetch truncated part of a message. Returned data is a tuple of message part envelope and data.

ctypes.sizeof(obj_or_type) Returns the size in bytes of a ctypes type or instance memory buffer. Does the same as the C sizeof operator.

fcntl.lockf(fd, cmd, len=0, start=0, whence=0) This is essentially a wrapper around the fcntl() locking calls. fd is the file descriptor of the file to lock or unlock, and cmd is one of the following values: LOCK_UN – unlock LOCK_SH – acquire a shared lock LOCK_EX – acquire an exclusive lock When cmd is LOCK_SH or LOCK_EX, it can also be bitwise ORed with LOCK_NB to avoid blocking on lock acquisition. If LOCK_NB is used and the lock cannot be acquired, an OSError will be raised and the

class numbers.Complex Subclasses of this type describe complex numbers and include the operations that work on the built-in complex type. These are: conversions to complex and bool, real, imag, +, -, *, /, abs(), conjugate(), ==, and !=. All except - and != are abstract. real Abstract. Retrieves the real component of this number. imag Abstract. Retrieves the imaginary component of this number. abstractmethod conjugate() Abstract. Returns the complex conjugate. For example, (1+