defassert_empty_tuple(t):assertnott,"Tuple is not empty" 1. 2. 测试示例 下面是一个示例代码,演示了如何使用断言来判断tuple是否为空。 defassert_empty_tuple(t):assertlen(t)==0,"Tuple is not empty"defmain():t1=()assert_empty_tuple(t1)print("t1 is empty")t2=(1,2,3)assert_empty_tu...
iflen(my_list)==0:print("List is empty") Although the first approach is considered to be morePythonic, some people prefer the explicit second approach. Note that the officialPEP 8 Python Style Guiderecommends the first way: "For sequences, (strings, lists, tuples), use the fact that em...
installalso creates${prefix}/bin/python3which refers to${prefix}/bin/python3.X. If you intend to install multiple versions using the same prefix you must decide which version (if any) is your "primary" version. Install that version usingmake install. Install all other versions usingmake ...
Q: Can these methods be used to check if other collections, like tuples or dictionaries, are empty? A: Yes, these methods can be used to check if any collection in Python, not just lists, is empty. An empty tuple, dictionary, set, etc., are all considered False in a boolean context...
Method 2: NumPy array empty check-in Python using shape() function Theshape()method in the NumPy Python library returns a tuple in Python representing the dimensions of the array. An empty array will have a shape of(0,). We can use this method to check if a NumPy array is empty in ...
4. Check if an item exist in tuple 要检查一个元组是否包含给定的元素,我们可以使用'in'关键词和'not in'关键词。 检查项目是否存在于元组中 Tuple = ("a", "b", "c", "d", "e", "f") if "a" in Tuple: print("Yes, 'a' is present") # Yes, 'a' is present ...
Function’s return values: When a function returns multiple values, you’ll typically use a tuple to pack these values together. Finally, tuples can be more memory-efficient than lists, especially for large collections where immutability is acceptable or preferred. Similarly, if the integrity of ...
print("Record name is:", R1.name) # Record name is: My Record 9. Python Tuples Methods 9.1. any() 返回True如果至少一个元素存在于元组,并返回False如果元组是空的。 print( any( () ) ) # Empty tuple - False print( any( (1,) ) ) # One element tuple - True ...
if arr is None: arr = [] arr.append(r) return arr 一般,默认参数可以像这样设置, def foo2(myList=None, myDict=None, myTuple=(1, 2, 3), i=10, mystr="hello"): ... 22. 在列表上慎用"+="来赋值 对一个列表做+=操作,相当于调用列表的extend函数。对列表的+=操作,不能等同于 lst ...
Tuple = ("a", "b", "c") for x in Tuple: print(x) 4. Check if an item exist in tuple 要检查一个元组是否包含给定的元素,我们可以使用'in'关键词和'not in'关键词。 检查项目是否存在于元组中 Tuple=("a","b","c","d","e","f")if"a"inTuple:print("Yes, 'a' is present")#...