重写过程中,再次出现IndexError: list index out of range,以及报错的行数。 好端端的怎么越界了= = 我用len()方法,获取到了包含数据父元素的个数,当前页面是有50条数据的 然后用for x in range()方法,循环将数据以一定格式输出 listLen = len(selector.css("#resultList>div.el>p.t1>span>a::attr(ti...
fromunicode(s):将一个Unicode字符串中的字符添加到当前array对象中,不过此时array对象必须是'u'类型,如果s是其他类型,可以使用array.frombytes(unicodestring.encode(enc))。 index(x):返回x在array中的第一个索引。 insert(i, x):在位置i前插入值x,i允许为负值。 pop([i]):从array数组中删除并返回索引为...
IIn[15]:'a%sc'%'b'Out[15]:'abc'In[16]:'a%sc%s'%('b',10)Out[16]:'abc10'In[17]:'a%sc%s'%('b',3.14)Out[17]:'abc3.14'In[18]:'a%sc%s'%('b','中文')Out[18]:'abc中文'# 整数测试 In[19]:'num=%d'%150Out[19]:'num=150'In[20]:'num=%f'%3.14Out[20]:'num=3....
int Find(string findStr, int startIndex)Finds the index of the first string equal to findStr. The search begins at startIndex. If the string is not found, -1 is returned. The first string in the array is at index 0. top FindFirstMatch int FindFirstMatch(string matchPattern, int start...
string index() -- return index of first occurrence of an object insert() -- insert a new item into the array at a provided position pop() -- remove and return item (default last) remove() -- remove first occurrence of an object reverse() -- reverse the order of the items in the...
A new array whose items are restricted by typecode, and initializedfrom the optional initializer value, which must be a list, abytes-like object, or iterable over elements of theappropriate type. If given a list or string, the initializer is passed to the new array’sfromlist(), frombytes...
A few weeks ago I was helping someone write a Python script to automate their work-flow. At one point we needed to create a string array. Since it was a while since I last coded in Python, I didn’t have the syntax memorized on how to create an array of strings. What to do? A...
Concatenate any number of strings. The string whose method is called is inserted in between each given string. The result is returned as a new string. Example: '.'.join(['ab', 'pq', 'rs']) -> 'ab.pq.rs' """pass 看了构造就知道函数内需要传入可迭代对象,所以我们先传入一个列表演示...
a = np.array([1,2,3])` 1. np.r_[np.repeat(a, 3), np.tile(a, 3)] #> array([1, 1, 1, 2, 2, 2, 3, 3, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3]) 1. 2. 创建一定维度的矩阵:np.full((2,3),5) 其中创建布尔值矩阵的方法是:np.full((2,3),Ture,dtype=bool);或者...
index_string ::= <any source character except "]"> + conversion ::= "r" | "s" | "a" format_spec ::= <described in the next section> format_spec 的格式 format_spec ::= [[fill]align][sign][#][0][width][,][.precision][type] fill ::= <any character> align ::= "<" |...