或者,我们可以使用any()函数。 my_list = ['a','b',None,'c']ifany(itemisNoneforiteminmy_list):# 👇️ this runsprint('list contains a None value') any函数将一个可迭代对象作为参数,如果可迭代对象的任何元素为真,则返回 True。 my_list = ['a','b',None,'c']# 👇️ Trueprint(...
element_to_check= 3ifcontains_element(my_list, element_to_check):print(f"{element_to_check} 存在于列表中。")else:print(f"{element_to_check} 不存在于列表中。")11. 使用 index() 方法 index() 方法能够返回指定元素的索引值,如果元素不存在,则抛出 ValueError。可以通过捕获异常的方式判断元素是否...
if my_list.count(element_to_check) > 0: print(f"{element_to_check} 存在于列表中。") else: print(f"{element_to_check} 不存在于列表中。") 1. 2. 3. 4. 5. 6. 3. 使用any()函数 any()函数接受一个可迭代对象,只要其中任何一个元素为真(即非零、非空、非None等),就返回True。这个特...
This operator is shorthand for calling an object's __contains__ method, and also works well for checking if an item exists in a list. It's worth noting that it's not null-safe, so if our fullstring was pointing to None, an exception would be thrown: TypeError: argument of type 'No...
(self, *args, **kwargs): # real signature unknown """ Return True if two sets have a null intersection. 如果没有交集,返回True,否则返回False""" pass def issubset(self, *args, **kwargs): # real signature unknown """ Report whether another set contains this set. 是否是子序列""" ...
static PyObject * // 这个函数的传入参数是列表本身 self 需要 append 的元素为 v // 也就是将对象 v 加入到列表 self 当中 listappend(PyListObject *self, PyObject *v) { if (app1(self, v) == 0) Py_RETURN_NONE; return NULL; } static int app1(PyListObject *self, PyObject *v) { ...
迭代通常是隐式的。如果一个集合没有__contains__方法,in运算符会进行顺序扫描。恰好:in适用于我们的FrenchDeck类,因为它是可迭代的。看看这个: >>>Card('Q','hearts')indeckTrue>>>Card('7','beasts')indeckFalse 那么排序呢?一个常见的牌的排名系统是先按点数(A 最高),然后按花色顺序:黑桃(最高)、...
if input_string == "": print("Input string is an empty string.") else: myList = [True for character in input_string if character in whitespaces] output = all(myList) if output: print("The string contains only whitespace characters.") else: print("The string contains characters other ...
filename extension is '.txt' REMOTE_PATH_MEMID = '/stack/stack_member.txt' # File path of license list file, filename extension is '.xml' REMOTE_PATH_LICLIST = 'Index.xml' # File path of sha256 file, contains sha256 value of image / patch / memid / license file, file extension...
(0, 76, __pyx_L1_error) /* "pystone.py":77 * Char1Glob = '\0' * Char2Glob = '\0' * Array1Glob = [0]*51 # <<< * Array2Glob = list(map(lambda x: x[:], [Array1Glob]*51)) * PtrGlb = None */ __pyx_t_7 = PyList_New(1 * 51); if (unlikely(!__pyx_...