我们平时用的最多的是Object,比如你定义一个类时,会继承object: >>> class Test(object): ... pass 1. 2. 这里你定义了一个自定义类Test,不难看出,Test继承了object,也就是说,object是Test的超类(或者说基类)。 接下来,你可以再定义一个类: >>> class subTest(Test): ... pass 1. 2
last): File "<stdin>", line 1, in <module> TypeError: 'set' object does not support indexing、 与集合有关的方法和函数 add() add()用来一组集合里添加新元素其返回值依然是集合,举例如下: >>> vendors.add('Huawei') >>> vendorsset
1classset(object):2"""3 set() -> new empty set object 4 set(iterable) -> new set object 5 6 Build an unordered collection of unique elements. 7"""8defadd(self, *args, **kwargs):#real signature unknown9"""10 Add an element to a set. 11 12 This has no effect if the elemen...
set() -> new empty set object 把可迭代的数据类型转换成元组 set(iterable) -> new set object Build an unordered collection of unique elements.""" View Code #向集合中增加元素,如果存在,不做任何操作。defadd(self, *args, **kwargs):#real signature unknown"""Add an element to a set. This...
set的内建方法help(set) >>> help(set) Help on class set in module __builtin__: class set(object) | set() -> new empty set object | set(iterable) -> new set object | | Build an unordered collection of unique elements. |
用__add__()方法来说,从样式上看它是特殊方法,特殊之处在于,这个方法定义了’+‘运算符对于list对象的意义。比如两个list对象相加时: print([1,2,3]+[4,5]) #打印结果为[1,2,3,4,5] 1. 2. 对于list对象,它的运算符,’+‘,’-‘,’>‘,'<',and,or等都是通过这些特殊方法实现的: ...
['To'] = recipient_email message['Subject'] = subject message.attach(MIMEText(body, 'plain')) with open(file_path, "rb") as attachment: part = MIMEBase('application', 'octet-stream') part.set_payload(attachment.read()) encoders.encode_base64(part) part.add_header('Content-Disposition...
>>> names = set() >>> fileobj = resources[0] # 文件资源是一个file-like的object。 >>> for l in fileobj: >>> names.add(l) >>> collection = resources[1] >>> for r in collection: >>> names.add(r.name) # 这里可以通过字段名或者偏移来取。 >>> def h(x): >>> if x in...
} static int set_add_entry(PySetObject *so, setentry *entry) { Py_ssize_t n_used; PyObject *key = entry->key; Py_hash_t hash = entry->hash; assert(so->fill <= so->mask); /* at least one empty slot */ n_used = so->used; Py_INCREF(key); // 调用函数 set_insert_key...
print(result) # A result object can be indexed to get the output value. Note: a result object # also has a getOutput() method that can be used for the same purpose. result_value = result[0] 如果为结果对象建立索引或使用其 getOutput() 方法,那么返回值为字符串。 当使用派生输出参数运行...