Although, we wouldn’t typically do this in a Python program,for us to really see the content of that range object,so what we can do in this case is we can turn it into a list. 所以如果我们说“范围5列表”,我们会看到范围对象由五个
从spam[0:5]得到的子串将包括从spam[0]到spam[4]的所有内容,去掉索引 5 处的逗号和索引 6 处的空格。这类似于range(5)如何导致for循环迭代到5,但不包括5。 请注意,对字符串进行切片不会修改原始字符串。您可以在单独的变量中捕获一个变量的切片。尝试在交互式 Shell 中输入以下内容: 代码语言:javascript ...
p = pd.Panel(data=np.arange(24).reshape(4,3,2), items=list('ABCD'), major_axis=pd.date_range('20130101', periods=3), minor_axis=['first', 'second']) # 结果 <class 'pandas.core.panel.Panel'> Dimensions: 4 (items) x 3 (major_axis) x 2 (minor_axis) Items axis: A to D...
Common Mistake #10: Misusing the__del__method Let’s say you had this in a file calledmod.py: import fooclassBar(object): ...def__del__(self): foo.cleanup(self.myhandle) And you then tried to do this fromanother_mod.py:
for_stmt: 'for' exprlist 'in' testlist ':' suite ['else' ':' suite] Where exprlist is the assignment target. This means that the equivalent of {exprlist} = {next_value} is executed for each item in the iterable. An interesting example that illustrates this: for i in range(4):...
great_students = [add 'the great' to eachstudent, for eachstudentin the list of students] 代码如下所示: # Consider some students. students = ['bernice', 'aaron', 'cody'] # Let's turn them into great students. great_students = [student.title() + " the great!" for student in stud...
zero_to_one_split_into_64_parts = torch.tensor (range (64))/64zero_to_one_split_into_64_parts tensor([0.0000,0.0156,0.0312,0.0469,0.0625,0.0781,0.0938,0.1094,0.1250,0.1406,0.1562,0.1719,0.1875,0.2031,0.2188,0.2344,0.2500,0.2656,0.28...
def wrapper_repeat(*args, **kwargs): for _ in range(num_times): value = func(*args, **kwargs) return value This wrapper_repeat() function takes arbitrary arguments and returns the value of the decorated function, func(). This wrapper function also contains the loop that calls the decor...
Or, you could also use an iterator and the range() function: >>> number_list = [] >>> for number in range(1, 6): ... number_list.append(number) ... >>> number_list [1, 2, 3, 4, 5] Or, you could just turn the output of range() into a list directly: >>> number...
mpy-cross/ -- the MicroPython cross-compiler which is used to turn scripts into precompiled bytecode. ports/ -- platform-specific code for the various ports and architectures that MicroPython runs on. lib/ -- submodules for external dependencies. tests/ -- test framework and test scripts. doc...