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timeit.cpython-36.pyc
3 \ 4 � @ s� d Z ddlZddlZddlZddlZddddgZdZdZd Zej Z e Z d Z d d � ZG d d� d�Zdde edfdd�Zdde eedfdd�Zddd�dd�Zedkr�eje� � dS )am Tool for measuring execution time of small code snippets. This module avoids a number of common traps for measuring execution times. See also Tim Peters' introduction to the Algorithms chapter in the Python Cookbook, published by O'Reilly. Library usage: see the Timer class. Command line usage: python timeit.py [-n N] [-r N] [-s S] [-t] [-c] [-p] [-h] [--] [statement] Options: -n/--number N: how many times to execute 'statement' (default: see below) -r/--repeat N: how many times to repeat the timer (default 3) -s/--setup S: statement to be executed once initially (default 'pass'). Execution time of this setup statement is NOT timed. -p/--process: use time.process_time() (default is time.perf_counter()) -t/--time: use time.time() (deprecated) -c/--clock: use time.clock() (deprecated) -v/--verbose: print raw timing results; repeat for more digits precision -u/--unit: set the output time unit (usec, msec, or sec) -h/--help: print this usage message and exit --: separate options from statement, use when statement starts with - statement: statement to be timed (default 'pass') A multi-line statement may be given by specifying each line as a separate argument; indented lines are possible by enclosing an argument in quotes and using leading spaces. Multiple -s options are treated similarly. If -n is not given, a suitable number of loops is calculated by trying successive powers of 10 until the total time is at least 0.2 seconds. Note: there is a certain baseline overhead associated with executing a pass statement. It differs between versions. The code here doesn't try to hide it, but you should be aware of it. The baseline overhead can be measured by invoking the program without arguments. Classes: Timer Functions: timeit(string, string) -> float repeat(string, string) -> list default_timer() -> float � N�Timer�timeit�repeat� default_timerz <timeit-src>i@B � z� def inner(_it, _timer{init}): {setup} _t0 = _timer() for _i in _it: {stmt} _t1 = _timer() return _t1 - _t0 c C s | j ddd| �S )z*Helper to reindent a multi-line statement.� � )�replace)�src�indent� r � /usr/lib64/python3.6/timeit.py�reindentP s r c @ sP e Zd ZdZddedfdd�Zddd�Zefdd �Ze efd d �Z dd d �Z dS )r a� Class for timing execution speed of small code snippets. The constructor takes a statement to be timed, an additional statement used for setup, and a timer function. Both statements default to 'pass'; the timer function is platform-dependent (see module doc string). If 'globals' is specified, the code will be executed within that namespace (as opposed to inside timeit's namespace). To measure the execution time of the first statement, use the timeit() method. The repeat() method is a convenience to call timeit() multiple times and return a list of results. The statements may contain newlines, as long as they don't contain multi-line string literals. �passNc C s� || _ i }|dkrt� n|}d}t|t�rJt|td� |d }t|d�}n*t|�rl||d< |d7 }d}d}ntd ��t|t�r�t|| td� t|d �}n&t|�r�||d < |d 7 }d }ntd��t j |||d�} | | _ t| td�} t | ||� |d | _ dS )z#Constructor. See class doc string.N� �execr � �_setupz, _setup=_setupz_setup()z&setup is neither a string nor callable� Z_stmtz , _stmt=_stmtz_stmt()z%stmt is neither a string nor callable)�stmt�setup�init�inner)�timer�_globals� isinstance�str�compile�dummy_src_namer �callable� ValueError�template�formatr r r ) �selfr r r �globalsZlocal_nsZ global_nsr Z stmtprefixr �coder r r �__init__f s6 zTimer.__init__c C sJ ddl }ddl}| jdk r:t| j�d| jjd�tf|jt< |j|d� dS )a� Helper to print a traceback from the timed code. Typical use: t = Timer(...) # outside the try/except try: t.timeit(...) # or t.repeat(...) except: t.print_exc() The advantage over the standard traceback is that source lines in the compiled template will be displayed. The optional file argument directs where the traceback is sent; it defaults to sys.stderr. r Nr )�file)� linecache� tracebackr �len�splitr �cache� print_exc)r# r' r( r) r r r r- � s zTimer.print_excc C sB t jd|�}tj� }tj� z| j|| j�}W d|r<tj� X |S )a� Time 'number' executions of the main statement. To be precise, this executes the setup statement once, and then returns the time it takes to execute the main statement a number of times, as a float measured in seconds. The argument is the number of times through the loop, defaulting to one million. The main statement, the setup statement and the timer function to be used are passed to the constructor. N)� itertoolsr �gc� isenabled�disabler r �enable)r# �number�itZgcoldZtimingr r r r � s z Timer.timeitc C s. g }x$t |�D ]}| j|�}|j|� qW |S )a� Call timeit() a few times. This is a convenience function that calls the timeit() repeatedly, returning a list of results. The first argument specifies how many times to call timeit(), defaulting to 3; the second argument specifies the timer argument, defaulting to one million. Note: it's tempting to calculate mean and standard deviation from the result vector and report these. However, this is not very useful. In a typical case, the lowest value gives a lower bound for how fast your machine can run the given code snippet; higher values in the result vector are typically not caused by variability in Python's speed, but by other processes interfering with your timing accuracy. So the min() of the result is probably the only number you should be interested in. After that, you should look at the entire vector and apply common sense rather than statistics. )�ranger �append)r# r r3 �r�i�tr r r r � s z Timer.repeatc C sF x<t dd�D ].}d| }| j|�}|r0|||� |dkr P q W ||fS )a� Return the number of loops and time taken so that total time >= 0.2. Calls the timeit method with *number* set to successive powers of ten (10, 100, 1000, ...) up to a maximum of one billion, until the time taken is at least 0.2 second, or the maximum is reached. Returns ``(number, time_taken)``. If *callback* is given and is not None, it will be called after each trial with two arguments: ``callback(number, time_taken)``. � � g�������?)r5 r )r# �callbackr8 r3 � time_takenr r r � autorange� s zTimer.autorange)N)N) �__name__� __module__� __qualname__�__doc__r r& r- �default_numberr �default_repeatr r> r r r r r T s " r c C s t | |||�j|�S )zCConvenience function to create Timer object and call timeit method.)r r )r r r r3 r$ r r r r � s c C s t | |||�j||�S )zCConvenience function to create Timer object and call repeat method.)r r )r r r r r3 r$ r r r r � s )� _wrap_timerc s^ | dkrt jdd� } ddl}y(|j| dddddd d d d d g �\}} W n2 |jk rx } zt|� td� dS d}~X nX t}dj| �p�d}d}g }t} d} d} dddd�} d� � x�|D � ]�\} }| d9kr�t|�}| d:kr�|j |� | d;k�r|| k� r�|} ntd t j d � dS | d<k�r0t|�} | dk�r0d} | d=k�r@t j }| d>k�rPt j }| d?k�r`t j }| d@k�r�| �rx� d7 � | d7 } | dAkr�ttd*d+� dS q�W dj|��p�d}ddl}t jjd|j� |dk �r�||�}t|||�}|dk�r(d}| �r� fd,d-�}y|j|�\}}W n |j� dS y|j| |�}W n |j� dS t|�}| �rxtd.d*j� fd/d0�|D ��� td1| d*d+� |d | }| dk �r�| | }n>d2d0� | j� D �}|jd3d4� x |D ]\}} ||k�r�P �q�W td5| � || | f � t|�}|d | }t|�}||d6 k�rZ|d | }ddl}|j d7� || | f t d8d� dS )Ba� Main program, used when run as a script. The optional 'args' argument specifies the command line to be parsed, defaulting to sys.argv[1:]. The return value is an exit code to be passed to sys.exit(); it may be None to indicate success. When an exception happens during timing, a traceback is printed to stderr and the return value is 1. Exceptions at other times (including the template compilation) are not caught. '_wrap_timer' is an internal interface used for unit testing. If it is not None, it must be a callable that accepts a timer function and returns another timer function (used for unit testing). Nr: r z n:u:s:r:tcpvhznumber=zsetup=zrepeat=�time�clockZprocess�verbosezunit=�helpz#use -h/--help for command line help� r r g @�@g ��.A)�usecZmsecZsecr �-n�--number�-s�--setup�-u�--unitz4Unrecognized unit. Please select usec, msec, or sec.)r' �-r�--repeat�-t�--time�-c�--clock�-p� --process�-v� --verbose�-h�--helpr )�endc s d}t |j| |� d�� d S )Nz#{num} loops -> {secs:.{prec}g} secs)ZnumZsecsZprec)�printr" )r3 r= �msg)� precisionr r r< @ s zmain.<locals>.callbackz raw times:c s g | ]}d � |f �qS )z%.*gr )�.0�x)ra r r � <listcomp>O s zmain.<locals>.<listcomp>z %d loops,c S s g | ]\}}||f�qS r r )rb Zunit�scaler r r rd U s T)�reversez best of %d: %.*g %s per loopr ztThe test results are likely unreliable. The worst time (%.*g %s) was more than four times slower than the best time.r )rL rM )rN rO )rP rQ )rR rS )rT rU )rV rW )rX rY )rZ r[ )r\ r] ) �sys�argv�getopt�errorr_ r �joinrD �intr6 �stderrrF rG Z process_timerB �os�path�insert�curdirr r> r- r �min�items�sort�max�warnings� warn_explicit� UserWarning)�argsrE ri Zopts�errr r r3 r r rH Z time_unitZunits�o�arn r9 r< �_r7 ZbestrK re ZscalesZworstrv r )ra r �main� s� r~ �__main__)N)rB r/ rg rF r. �__all__r rC rD Z perf_counterr r$ r r! r r r r r~ r? �exitr r r r �<module>3 s* y
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