defrepeat(self, repeat=default_repeat, number=default_number):"""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 5; the second argument sp...
a match object,or Noneifno match was found."""return_compile(pattern,flags).fullmatch(string)defsearch(pattern,string,flags=0):"""Scan through string lookingfora match to the pattern,returning a match object,or Noneifno match was found."""return_compile(pattern,flags).search(string)deffind...
通过实现特殊方法__len__和__getitem__,我们的FrenchDeck表现得像一个标准的 Python 序列,允许它从核心语言特性(例如迭代和切片)和标准库中受益,如使用random.choice、reversed和sorted的示例所示。得益于组合,__len__和__getitem__实现可以将所有工作委托给一个list对象self._cards。 那么洗牌呢? 到目前为止,Fren...
| | __call__( (cnn_face_detection_model_v1)arg1, (list)imgs [, (int)upsample_num_times=0 [, (int)batch_size=128]]) -> mmod_rectangless : | takes a list of images as input returning a 2d list of mmod rectangles | | __init__(...) | __init__( (object)arg1, (str)...
Fetches the next row of a query result set, returning a single sequence, or None when no more data is available. fetchmany(size=cursor.arraysize) Fetches the next set of rows of a query result, returning a list. An empty list is returned when no more rows are available.The number of...
我们可以编写下面的代码片段来确定调用add_three(number)的次数：add_three_calls = 0def add_three(number):"""Return *number* + 3.""" global add_three_calls print(f'Returning {number + 3}') add_three_calls += 1 return number + 3def num_calls(): """Return the number ...
You saw that, to define a decorator, you typically define a function returning a wrapper function. The wrapper function uses *args and **kwargs to pass on arguments to the decorated function. If you want your decorator to also take arguments, then you need to nest the wrapper function insi...
DataFrame.unstack([level, fill_value]) #Pivot a level of the (necessarily hierarchical) index labels, returning a DataFrame having a new level of column labels whose inner-most level consists of the pivoted index labels. DataFrame.melt([id_vars, value_vars, …]) #“Unpivots” a DataFrame ...
opcode=arg[A][a].lower opn=arg[A][b:] #print(opn) ifopcode=='4': M[opn[a]]=M[opn[b]]+M[opn[c]] elifopcode=='3': M[opn[a]]=M[opn[b]]*M[opn[c]] elifopcode=='5': M[opn[a]]=M[opn[a]] elifopcode=='1': ...
An object capable of returning its members one at a time. Examples of iterables include all sequence types (such as list, str, and tuple) and some non-sequence types like dict, file objects, and objects of any classes you define with an iter() method or with a getitem() method that ...