line 1, in <module> TypeError: startswith first arg must be str or a tuple of str, not list >>> url.startswith(tuple(choices)) True >>>
10、删除序列相同元素并保持顺序 序列上的值都是可哈希类型【不可变类型】defdedupe(items): seen =set()foriteminitems:ifitemnotinseen:yielditem seen.add(item)>>>a = [1,5,2,1,9,1,5,10]>>>list(dedupe(a)) [1,5,2,9,10] >>> 消除元素不可哈希(比如dict类型)的序列中重复元素的话defde...
>>> a = [ {'x':1, 'y':2}, {'x':1, 'y':3}, {'x':1, 'y':2}, {'x':2, 'y':4}] >>> list(dedupe(a, key=lambda d: (d['x'],d['y']))) [{'x': 1, 'y': 2}, {'x': 1, 'y': 3}, {'x': 2, 'y': 4}] >>> list(dedupe(a, key=lambda d:...
read('path/to/file.geojson') >>> f.seek(0) >>> records = io.read(f, ext='csv', dedupe=True)Please see readers for a complete list of available readers and recognized file types.Processing dataNumerical analysis (à la pandas) [3]In the following example, pandas equivalent methods ...
pipe2py.Context object _INPUT : iterable of items or strings conf : { 'to-str': {'value': <delimiter>}, 'dedupe': {'type': 'bool', value': <1>}, 'sort': {'type': 'bool', value': <1>} } Returns --- _OUTPUT : generator of items """ conf['delimiter'] = conf.pop...
chapter 1 杂 对于嵌套不必要类容丢失的分解: %%%%% 拆分方法的精巧函数: %%% 建议python不要写递归,python递归很艹,是因为其内在的递归限制所致...
Adding or popping items from either end of a queue has O(1) complexity. This is unlike a list where inserting or removing items from the front of the list is O(N). 1.4. Finding the Largest or Smallest N Items Problem You want to make a list of the largest or smallest N items in...
def dedupe(items): seen = set() for item in items: if item not in seen: yield item seen.add(item) 下面是使用上述函数的例子: >>> a = [1, 5, 2, 1, 9, 1, 5, 10] >>> list(dedupe(a)) [1, 5, 2, 9, 10]
def dedupe(items): seen = set() for item in items: if item not in seen: yield item seen.add(item) 1. 2. 3. 4. 5. 6.下面是使用上述函数的例子: AI检测代码解析 >>> a = [1, 5, 2, 1, 9, 1, 5, 10] >>> list(dedupe(a)) [1, 5, 2, 9, 10] >>> 1. 2. 3. 4...
关键:collections.Counter(list)类;most_common(3);可跟数学运算操作相结合 1.13 通过某个关键字排序一个字典列表 关键:operator 模块的 itemgetter 函数;将itemgetter作为key传入sorted(),也适用于max/min();有时候也可以用 lambda 表达式代替,但itemgetter更快 ...