math.atan(x) Return the arc tangent of x, in radians.

compare_total_mag(other, context=None) Compare two operands using their abstract representation rather than their value as in compare_total(), but ignoring the sign of each operand. x.compare_total_mag(y) is equivalent to x.copy_abs().compare_total(y.copy_abs()). This operation is unaffected by context and is quiet: no flags are changed and no rounding is performed. As an exception, the C version may raise InvalidOperation if the second operand cannot be converted exactly.

Element.removeAttribute(name) Remove an attribute by name. If there is no matching attribute, a NotFoundErr is raised.

class tkinter.tix.LabelFrame The LabelFrame widget packages a frame widget and a label into one mega widget. To create widgets inside a LabelFrame widget, one creates the new widgets relative to the frame subwidget and manage them inside the frame subwidget.

assertFalse(expr, msg=None) Test that expr is true (or false). Note that this is equivalent to bool(expr) is True and not to expr is True (use assertIs(expr, True) for the latter). This method should also be avoided when more specific methods are available (e.g. assertEqual(a, b) instead of assertTrue(a == b)), because they provide a better error message in case of failure.

signal.getsignal(signalnum) Return the current signal handler for the signal signalnum. The returned value may be a callable Python object, or one of the special values signal.SIG_IGN, signal.SIG_DFL or None. Here, signal.SIG_IGN means that the signal was previously ignored, signal.SIG_DFL means that the default way of handling the signal was previously in use, and None means that the previous signal handler was not installed from Python.

shlex.infile The name of the current input file, as initially set at class instantiation time or stacked by later source requests. It may be useful to examine this when constructing error messages.

classmethod fromkeys(seq[, value]) Create a new dictionary with keys from seq and values set to value. fromkeys() is a class method that returns a new dictionary. value defaults to None.

rfind(sub[, start[, end]]) Returns the highest index in the object where the subsequence sub is found, such that sub is contained in the range [start, end]. Optional arguments start and end are interpreted as in slice notation. Returns -1 on failure. Changed in version 3.5: Writable bytes-like object is now accepted.

class email.message.EmailMessage(policy=default) If policy is specified (it must be an instance of a policy class) use the rules it specifies to udpate and serialize the representation of the message. If policy is not set, use the default policy, which follows the rules of the email RFCs except for line endings (instead of the RFC mandated \r\n, it uses the Python standard \n line endings). For more information see the policy documentation. This class is a subclass of Message. It adds the fo