python3.7的扩展包

# -*- coding: utf-8 -*- # Autogenerated by Sphinx on Tue Jun 12 00:39:48 2018 topics = {'assert': 'The "assert" statement\n' '**********************\n' '\n' 'Assert statements are a convenient way to insert debugging ' 'assertions\n' 'into a program:\n' '\n' ' assert_stmt ::= "assert" expression ["," expression]\n' '\n' 'The simple form, "assert expression", is equivalent to\n' '\n' ' if __debug__:\n' ' if not expression: raise AssertionError\n' '\n' 'The extended form, "assert expression1, expression2", is ' 'equivalent to\n' '\n' ' if __debug__:\n' ' if not expression1: raise AssertionError(expression2)\n' '\n' 'These equivalences assume that "__debug__" and "AssertionError" ' 'refer\n' 'to the built-in variables with those names. In the current\n' 'implementation, the built-in variable "__debug__" is "True" under\n' 'normal circumstances, "False" when optimization is requested ' '(command\n' 'line option -O). The current code generator emits no code for an\n' 'assert statement when optimization is requested at compile time. ' 'Note\n' 'that it is unnecessary to include the source code for the ' 'expression\n' 'that failed in the error message; it will be displayed as part of ' 'the\n' 'stack trace.\n' '\n' 'Assignments to "__debug__" are illegal. The value for the ' 'built-in\n' 'variable is determined when the interpreter starts.\n', 'assignment': 'Assignment statements\n' '*********************\n' '\n' 'Assignment statements are used to (re)bind names to values and ' 'to\n' 'modify attributes or items of mutable objects:\n' '\n' ' assignment_stmt ::= (target_list "=")+ (starred_expression ' '| yield_expression)\n' ' target_list ::= target ("," target)* [","]\n' ' target ::= identifier\n' ' | "(" [target_list] ")"\n' ' | "[" [target_list] "]"\n' ' | attributeref\n' ' | subscription\n' ' | slicing\n' ' | "*" target\n' '\n' '(See section Primaries for the syntax definitions for ' '*attributeref*,\n' '*subscription*, and *slicing*.)\n' '\n' 'An assignment statement evaluates the expression list ' '(remember that\n' 'this can be a single expression or a comma-separated list, the ' 'latter\n' 'yielding a tuple) and assigns the single resulting object to ' 'each of\n' 'the target lists, from left to right.\n' '\n' 'Assignment is defined recursively depending on the form of the ' 'target\n' '(list). When a target is part of a mutable object (an ' 'attribute\n' 'reference, subscription or slicing), the mutable object must\n' 'ultimately perform the assignment and decide about its ' 'validity, and\n' 'may raise an exception if the assignment is unacceptable. The ' 'rules\n' 'observed by various types and the exceptions raised are given ' 'with the\n' 'definition of the object types (see section The standard type\n' 'hierarchy).\n' '\n' 'Assignment of an object to a target list, optionally enclosed ' 'in\n' 'parentheses or square brackets, is recursively defined as ' 'follows.\n' '\n' '* If the target list is empty: The object must also be an ' 'empty\n' ' iterable.\n' '\n' '* If the target list is a single target in parentheses: The ' 'object\n' ' is assigned to that target.\n' '\n' '* If the target list is a comma-separated list of targets, or ' 'a\n' ' single target in square brackets: The object must be an ' 'iterable\n' ' with the same number of items as there are targets in the ' 'target\n' ' list, and the items are assigned, from left to right, to ' 'the\n' ' corresponding targets.\n' '\n' ' * If the target list contains one target prefixed with an\n' ' asterisk, called a “starred” target: The object must be ' 'an\n' ' iterable with at least as many items as there are targets ' 'in the\n' ' target list, minus one. The first items of the iterable ' 'are\n' ' assigned, from left to right, to the targets before the ' 'starred\n' ' target. The final items of the iterable are assigned to ' 'the\n' ' targets after the starred target. A list of the remaining ' 'items\n' ' in the iterable is then assigned to the starred target ' '(the list\n' ' can be empty).\n' '\n' ' * Else: The object must be an iterable with the same number ' 'of\n' ' items as there are targets in the target list, and the ' 'items are\n' ' assigned, from left to right, to the corresponding ' 'targets.\n' '\n' 'Assignment of an object to a single target is recursively ' 'defined as\n' 'follows.\n' '\n' '* If the target is an identifier (name):\n' '\n' ' * If the name does not occur in a "global" or "nonlocal" ' 'statement\n' ' in the current code block: the name is bound to the object ' 'in the\n' ' current local namespace.\n' '\n' ' * Otherwise: the name is bound to the object in the global\n' ' namespace or the outer namespace determined by ' '"nonlocal",\n' ' respectively.\n' '\n' ' The name is rebound if it was already bound. This may cause ' 'the\n' ' reference count for the object previously bound to the name ' 'to reach\n' ' zero, causing the object to be deallocated and its ' 'destructor (if it\n' ' has one) to be called.\n' '\n' '* If the target is an attribute reference: The primary ' 'expression in\n' ' the reference is evaluated. It should yield an object with\n' ' assignable attributes; if this is not the case, "TypeError" ' 'is\n' ' raised. That object is then asked to assign the assigned ' 'object to\n' ' the given attribute; if it cannot perform the assignment, it ' 'raises\n' ' an e