方法/步骤 1 python 3的命名元组在collections模块内，如图。构造命名元组非常简单，使用namedtuple然后指定类型名和各个字段名。2 各个字段名除了可以写成一个字符串，空格隔开，也可以写成一个列表，如图。要读取字段值，使用'.'运算符。3 此外，命名元组还可以通过数字下标读取各个字段，也可以多赋值来展开...
name with which this function was defined func_code code object containing compiled function bytecode func_defaults tuple of any default values for arguments func_doc (same as __doc__) func_globals global namespace in which this function was defined func_name (same as __name__) generator _...
defaults=tuple(defaults)iflen(defaults) >len(field_names):raiseTypeError('Got more default values than field names') field_defaults=dict(reversed(list(zip(reversed(field_names), reversed(defaults)))#Variables used in the methods and docstringsfield_names =tuple(map(_sys.intern, field_names)) n...
add(name) field_defaults = {} if defaults is not None: defaults = tuple(defaults) if len(defaults) > len(field_names):# 默认值长度大于总长度时候报错 raise TypeError('Got more default values than field names') field_defaults = dict(reversed(list(zip(reversed(field_names), reversed(defaults...
使用图像中对象的凸包自动裁剪图像(问题取自https://stackoverflow.com/questions/14211340/automatically-cropping-an-image-with-python-pil/51703287#51703287)。使用以下图像并裁剪白色背景: [外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-qxbyj6kF-1681961425703)(https://gitcode.net/apac...
def init(): global _cache _cache = {} # Maps key to (datetime, value) tuple.如你所见,我们创建了一个名为init()的新函数。这个函数的第一条语句global _cache定义了一个名为_cache的新变量。global语句使得这个变量作为模块级全局变量可用,也就是说,这个变量可以被cache.py模块的所有部分共享。
If you’ve called it with arguments, then _func will be None, and some of the keyword arguments may have been changed from their default values. The asterisk in the argument list means that you can’t call the remaining arguments as positional arguments. Line 6: In this case, you called...
sep: string inserted between values, default a space. end: string appended after the last value, default a newline. flush: whether to forcibly flush the stream. """pass sep=' '分隔符,默认为一个空格 end='\n'结束符,默认以换行结束 ...
The only required value is stop; as with slices, the last value created will be just before stop. The default value of step is 1, but you can go backward with -1. Like zip(), range() returns an iterable object, so you need to step through the values with for ... in, or ...
(for a Turtle instance named turtle):| >>> turtle.clear()|| clearstamp(self, stampid)| Delete stamp with given stampid|| Argument:| stampid - an integer, must be return value of previous stamp() call.|| Example (for a Turtle instance named turtle):| >>> turtle.color("blue")| ...