Python sys.displayhook函数代码示例

    def edit_syntax_error(self):
        """The bottom half of the syntax error handler called in the main loop.

        Loop until syntax error is fixed or user cancels.
        """

        while self.SyntaxTB.last_syntax_error:
            # copy and clear last_syntax_error
            err = self.SyntaxTB.clear_err_state()
            if not self._should_recompile(err):
                return
            try:
                # may set last_syntax_error again if a SyntaxError is raised
                self.safe_execfile(err.filename,self.user_ns)
            except:
                self.showtraceback()
            else:
                try:
                    f = open(err.filename)
                    try:
                        # This should be inside a display_trap block and I
                        # think it is.
                        sys.displayhook(f.read())
                    finally:
                        f.close()
                except:
                    self.showtraceback()

 def pre_prompt(self, ip):
     ec = self.shell.execution_count
     try:
         for num, result in self.delayed:
             self.shell.execution_count = num
             sys.displayhook(result)
         self.delayed = []
     finally:
         self.shell.execution_count = ec

def pretty_print(thing):
    if isinstance(thing, str):
        py_print(thing)
    elif not isinstance(thing, (Mapping, Sequence)) and isinstance(thing, Iterable):
        sliced = []
        for n, item in enumerate(thing):
            if n < 5:
                sliced.append(item)
            else:
                sliced.append(raw('...'))
                break
        py_print("<iterable {}>".format(repr(sliced)))
    else:
        sys.displayhook(thing)

def pretty_print(thing):
    if isinstance(thing, str):
        _write(thing)
        _write('\n')
    elif not isinstance(thing, (Mapping, Sequence)) and isinstance(thing, Iterable):
        sliced = []
        for n, item in enumerate(thing):
            if n < 5:
                sliced.append(repr(item))
            else:
                sliced.append('...')
                break
        py_print("<iterable [{}]>".format(', '.join(sliced)))
    else:
        sys.displayhook(thing)
    return thing

def showcmd(args, stdin=None):
    """usage: showcmd [-h|--help|cmd args]

    Displays the command and arguments as a list of strings that xonsh would
    run in subprocess mode. This is useful for determining how xonsh evaluates
    your commands and arguments prior to running these commands.

    optional arguments:
      -h, --help            show this help message and exit

    example:
      >>> showcmd echo $USER can't hear "the sea"
      ['echo', 'I', "can't", 'hear', 'the sea']
    """
    if len(args) == 0 or (len(args) == 1 and args[0] in {'-h', '--help'}):
        print(showcmd.__doc__.rstrip().replace('\n    ', '\n'))
    else:
        sys.displayhook(args)

    def shell_substitute_run_ast_nodes(
                self,
                nodelist, cellname, interactivity='last_expr',
                compiler=compile, # ignored
                result=None,
            ):
        """
        Replaces get_ipython().run_ast_nodes
        """
        if not nodelist:
            return

        try:
            result_val = self.exec_ast_nodes(nodelist)
            if interactivity == 'last_expr':
                sys.displayhook(result_val)
            return False
        except:
            if result:
                result.error_before_exec = sys.exc_info()[1]
            self.shell.showtraceback()
            return True

    def evaluate(self, statement, session, printer=None, stream=None):
        """Evaluate the statement in sessions's globals. """
        # the Python compiler doesn't like network line endings
        source = statement.replace('\r\n', '\n').rstrip()

        # split source code into 'exec' and 'eval' parts
        exec_source, eval_source = self.split(source)

        try:
            self.compile(eval_source, 'eval')
        except (OverflowError, SyntaxError, ValueError):
            exec_source, eval_source = source, None

        if exec_source is not None:
            exec_source += '\n'
        if eval_source is not None:
            eval_source += '\n'

        # create a dedicated module to be used as this statement's __main__
        statement_module = new.module('__main__')

        # use this request's __builtin__, since it changes on each request.
        # this is needed for import statements, among other things.
        import __builtin__
        statement_module.__builtin__ = __builtin__

        # create customized display hook
        stringify_func = printer or sstr

        def displayhook(arg):
            if arg is not None:
                __builtin__._ = None
                print stringify_func(arg)
                __builtin__._ = arg

        old_displayhook = sys.displayhook
        sys.displayhook = displayhook

        # swap in our custom module for __main__. then unpickle the session
        # globals, run the statement, and re-pickle the session globals, all
        # inside it.
        old_main = sys.modules.get('__main__')

        try:
            sys.modules['__main__'] = statement_module
            statement_module.__name__ = '__main__'

            # re-evaluate the unpicklables
            for code in session.unpicklables:
                exec code in statement_module.__dict__

            old_globals = dict(statement_module.__dict__)

            # re-initialize the globals
            session_globals_dict = session.globals_dict()

            for name, val in session_globals_dict.items():
                try:
                    statement_module.__dict__[name] = val
                except:
                    session.remove_global(name)

            # re-initialize '_' special variable
            __builtin__._ = session_globals_dict.get('_')

            # run!
            offset = 0

            try:
                old_stdout = sys.stdout
                old_stderr = sys.stderr

                try:
                    if stream is not None:
                        sys.stdout = stream
                        sys.stderr = stream

                    if exec_source is not None:
                        try:
                            exec_code = self.compile(exec_source, 'exec')
                        except (OverflowError, SyntaxError, ValueError):
                            return self.error(stream, self.syntaxerror())

                        eval(exec_code, statement_module.__dict__)

                    if eval_source is not None:
                        if exec_source is not None:
                            offset = len(exec_source.split('\n'))

                        result = eval(eval_source, statement_module.__dict__)
                        sys.displayhook(result)
                finally:
                    sys.stdout = old_stdout
                    sys.stderr = old_stderr
            except:
                return self.error(stream, self.traceback(offset))

            # extract the new globals that this statement added
            new_globals = {}

#.........这里部分代码省略.........

def finished(outfile):
    """Print a closing message"""
    sys.displayhook("Fixed pseudoscaffold can be found at " + os.getcwd() + "/" + outfile)
    sys.exit(0)

 def eval(self, id, control_vals, displayhook):
     f, controls = self._interacts[id]
     assert len(controls) == len(control_vals)
     displayhook(f(*[c.eval(v) for c, v in zip(controls, control_vals)]))

    def evaluate(self, source):
        """Evaluate a piece of Python source code. """
        source = source.replace('\r', '').rstrip()

        # XXX: make all this SIGINT aware

        if '\n' in source:
            exec_source, eval_source = self.split(source)
        else:
            exec_source, eval_source = None, source

        eval_source += '\n'

        try:
            self.compile(eval_source, 'eval')
        except (OverflowError, SyntaxError, ValueError):
            if '\n' not in source and self.is_inspect(source):
                return self.inspect(source)

            exec_source = source
            eval_source = None

        try:
            del self.namespace['__plots__']
        except KeyError:
            pass

        interrupted = False
        traceback = False
        result = None

        start = time.clock()

        try:
            if exec_source is not None:
                try:
                    exec_code = self.compile(exec_source, 'exec')
                except (OverflowError, SyntaxError, ValueError):
                    traceback = self.syntaxerror()
                    eval_source = None
                else:
                    eval(exec_code, self.namespace)

            if eval_source is not None:
                result = eval(eval_source, self.namespace)
                sys.displayhook(result)
        except SystemExit:
            raise
        except KeyboardInterrupt:
            traceback = self.traceback()
            interrupted = True
        except:
            traceback = self.traceback()

        end = time.clock()

        try:
            plots = self.namespace['__plots__']
        except KeyError:
            plots = []

        self.index += 1

        if result is not None:
            self.namespace['_%d' % self.index] = result

            self.namespace['___'] = self.namespace.get('__')
            self.namespace['__'] = self.namespace.get('_')
            self.namespace['_'] = result

        result = {
            'source': source,
            'index': self.index,
            'time': end - start,
            'plots': plots,
            'traceback': traceback,
            'interrupted': interrupted,
        }

        return result

    def __call__(self, tp, val, argin3):
        global _auto_quote_funcs_

        # We only handle SyntaxErrors
        if not isinstance(val, exceptions.SyntaxError):
            self._orig_ehook(tp, val, argin3)
            return

        # Complain if we're not at the top level
        if (val.text[0]).isspace():
            raise RuntimeError, "LazyPython shortcuts do not work in loops or functions."

        # Test for shell escape
        if val.text[0] == _SHELL_ESCAPE:
            os.system(val.text[1:])
            return

        # 0 -> normal exception, 1 -> auto-quote, 2 -> auto-paren
        lp_mode = 0

        iFun = _first_word_re_.match(val.text)
        if iFun is None:  # Hard to see how this could happen, but just in case
            self._orig_ehook(tp, val, argin3)
            return
        iFun = iFun.group(0)[:-1]

        if val.text[0] == _PAREN_ESCAPE:
            # Check for the auto-paren escape
            lp_mode = 2
            iFun = iFun[1:]
            text = val.text[1:]
        elif val.text[0] == _QUOTE_ESCAPE:
            # Check for the auto-quote escape
            lp_mode = 1
            iFun = iFun[1:]
            text = val.text[1:]
        else:
            # See if it's an auto-quote/paren function or a callable
            text = val.text
            if iFun in _auto_quote_funcs_:
                lp_mode = 1
            elif iFun in _auto_paren_funcs_:
                lp_mode = 2
            else:
                try:
                    if callable(eval(iFun, _ns_)):
                        lp_mode = 2
                except:
                    lp_mode = 0

        # Now decide what to do based on lp_mode
        if lp_mode == 0:
            # Normal Exception
            self._orig_ehook(tp, val, argin3)
            return

        if lp_mode == 1:
            theRest = text[len(iFun) :].strip()
            # Auto-quote
            newcmd = iFun + '("' + '", "'.join(theRest.split()) + '")\n'
        elif lp_mode == 2:
            # Auto-paren
            # newcmd = iFun + '(' + ','.join(theRest.split()) + ')\n'
            theRest = text[len(iFun) :].strip()
            newcmd = iFun + "(" + theRest + ")\n"
        elif lp_mode == 3:
            pass  # newcmd has already been set
        else:
            raise RuntimeError, "Error in LazyPython.py!  Illegal lp_mode."

        # Try to execute the new command
        try:
            print "-->", newcmd
            sys.displayhook(eval(newcmd, _ns_))
            # exec newcmd in _ns_
        except:
            traceback.print_exc()

    def loop(self):
        while True:
            try:
                if self.readMore:
                    sys.stdout.write("... ")
                    sys.stdout.flush()
                    self.single_input += sys.stdin.readline()
                else:
                    sys.stdout.write(">>> ")
                    sys.stdout.flush()
                    self.single_input = sys.stdin.readline()

                input_stream = antlr4.InputStream(self.single_input)

                # Instantiate and run generated lexer
                self.lexer = CustomLexer(input_stream)
                self.tokens = antlr4.CommonTokenStream(self.lexer)

                # Setting up error handling stuff
                error_handler = CustomErrorStrategy()
                error_listener = CustomErrorListener()
                buffered_errors = BufferedErrorListener()
                error_listener.addDelegatee(buffered_errors)

                # Run parser and set error handler
                self.parser = TinyPyParser(self.tokens)
                self.parser._errHandler = error_handler

                # Remove default terminal error listener & and our own
                self.parser.removeErrorListeners()
                self.parser.addErrorListener(error_listener)

                # Parse input
                parse_tree = self.parser.single_input()

                # Determine what to do next
                if error_listener.eof_received:
                    print()
                    exit(0)
                elif error_listener.input_unfinished or self.lexer.opened > 0:
                    # User has not finished his input yet, read the next line and repeat
                    self.readMore = True
                    continue
                elif error_listener.errors_encountered > 0:
                    # Errors encountered, start over
                    print(buffered_errors.buffer)
                    self.readMore = False
                    continue
                else:
                    # Successfully parsed the input, next time start over
                    self.readMore = False

                # Build a flattened syntax tree
                cst = CST.CstFiltered(tree=parse_tree)

                # Print some stuff... (if needed)
                if self.args.cst:
                    print(cst)

                if self.args.parse_tree:
                    parseTreeString = Trees.toStringTree(parse_tree, recog=self.parser)
                    print(parseTreeString)

                # Evaluate it...
                visitor = CustomVisitor()
                ast = visitor.visitSingle_input(parse_tree)
                if ast == None:
                    continue

                if self.args.parse_only:
                    continue

                results = ast.eval()

                #
                # ast.eval() returns list of statements; loop through them and print
                #
                if results != None:
                    for statement in results:
                        if statement != None and not isinstance(statement, ControlFlowMark):
                            sys.displayhook(statement)

                #if results != None:
                #    sys.displayhook(results)

            except KeyboardInterrupt as e:
                print("")
                exit(0)
            except antlr4.RecognitionException as e:
                print("Caught" + str(e) )
            except runtime.Errors.BaseRuntimeException as e:
                print(e.__class__.__name__ + ": " + str(e))
            except SystemExit as e:
                sys.exit(e)
            except BaseException as e:
                print(e.__class__.__name__ + ": " + str(e))

# -*- coding:utf-8 -*-
from sympy import pprint
from sympy import Symbol
from sympy.matrices import *
from random import *
import sys
sys.displayhook(pprint)
import time
import numpy as np
import matplotlib.pyplot as plt


print '''
****************************************************************************
6. Estime a complexidade do algoritmo de solução de sistemas lineares do pacote computacional de sua
preferência: registre os tempos que o pacote levou para resolver sistemas aleatórios nxn, com n =
16; 32; 64; 128; 256; 512; 1024; 2048. Faça um gráfico do log do número de colunas contra o log dos tempos
registrados. O algoritmo do pacote tem complexidade inferior a O(nˆ3)?
'''

def random_ints(num, lower=-100, upper=100):
    return [randrange(lower,upper+1) for i in range(num)]

def geraMatriz(n, l=-100, u=100):
    return Matrix(n, n, random_ints(n**2, l, u))

tempoGeracao = {}
tempoDeterminante = {}
for n in range(4,11):
    
    ''' Contagem de tempo para criação das matrizes '''

print(sys.modules)  # 打印系统所有模块,字典形式返回
# print(sys.exit(2))  # 打印程序返回代码
print(sys.version)  # 打印python版本
print(sys.maxsize)  # 打印最大值
print(sys.path)  # 返回当前PYTHONPATH环境变量
print(sys.platform)  # 返回操作系统平台名称
print(sys.stdout.write("inpu9t"))  # 返回标准输出长度
# print(sys.stdin.readlin()[:-1])  # 标准输入,并分片取开头到倒数第一个(不包含)的内容
print(sys.modules.keys())  # 打印所有模块名
print(sys.modules.values())  # 打印所有模块位置
print(sys.exc_info())  # 获取当前正在处理的异常类,exc_type、exc_value、exc_traceback当前处理的异常详细信息
print(sys.hexversion)  # 获取十六进制的版本值
print(sys.api_version)  # 获取Cpython API版本
print(sys.version_info)  # 打印版本详细信息
print(
    sys.displayhook(2)
)  # 如果value非空，这个函数会把他输出到sys.stdout，并且将他保存进__builtin__._.指在python的交互式解释器里，’_’ 代表上次你输入得到的结果，hook是钩子的意思，将上次的结果钩过来
print(sys.getdefaultencoding())  # 获取当前默认编码格式
print(sys.getfilesystemencoding())  # 获取文件系统编码
print(sys.builtin_module_names)  # 打印内置模块名
print(sys.executable)  # 打印python解释权程序路径
print(sys.getprofile())
print(sys.getallocatedblocks())
# print(sys.copyright)  # 打印python版权信息
print(sys.byteorder)  # 本地字节规则的指示器，big-endian平台的值是’big’,little-endian平台的值是’little’
# print(sys.exc_value)
print(sys.stdin)  # 标准输入
print(sys.stdout)  # 标准输出
print(sys.stderr)  # 标准错误输出
print(sys.maxunicode)  #   打印最大unicode值

    def evaluate(self, source):
        """Evaluate a piece of Python source code. """
        source = source.replace('\r', '').rstrip()

        # XXX: make all this SIGINT aware

        if '\n' in source:
            exec_source, eval_source = self.split(source)
        else:
            exec_source, eval_source = None, source

        eval_source += '\n'

        try:
            self.compile(eval_source, 'eval')
        except (OverflowError, SyntaxError, ValueError):
            if '\n' not in source and self.is_inspect(source):
                return self.inspect(source)

            exec_source = source
            eval_source = None

        # If in debug mode, then don't setup output trap so that we can
        # run a debugger (e.g. pdb). Note that stdout and stderr won't
        # be captured and stored in the resulting dict object.
        if not self.debug:
            self.trap.set()

        try:
            try:
                del self.locals['__plots__']
            except KeyError:
                pass

            interrupted = False
            traceback = False
            result = None

            start = time.clock()

            try:
                if exec_source is not None:
                    try:
                        exec_code = self.compile(exec_source, 'exec')
                    except (OverflowError, SyntaxError, ValueError):
                        traceback = self.syntaxerror()
                        eval_source = None
                    else:
                        exec exec_code in self.locals

                if eval_source is not None:
                    result = eval(eval_source, self.locals)
                    sys.displayhook(result)
            except SystemExit:
                raise
            except KeyboardInterrupt:
                traceback = self.traceback()
                interrupted = True
            except:
                traceback = self.traceback()

            end = time.clock()

            try:
                plots = self.locals['__plots__']
            except KeyError:
                plots = []

            self.index += 1

            if result is not None:
                self.locals['_%d' % self.index] = result

                self.locals['___'] = self.locals.get('__')
                self.locals['__'] = self.locals.get('_')
                self.locals['_'] = result

            result = {
                'source': source,
                'index': self.index,
                'time': end - start,
                'out': self.trap.out,
                'err': self.trap.err,
                'plots': plots,
                'traceback': traceback,
                'interrupted': interrupted,
            }

            if traceback:
                result['traceback_html'] = self.highlight.traceback(traceback)

            return result
        finally:
            self.trap.reset()