nested_list = [[1, 2, 3], [4, 5, 6], [7, 8, 9]] for sublist in nested_list: for item in sublist: print(item) 在这个例子中,我们首先遍历nested_list的每个子列表,然后在内层循环中遍历每个子列表的元素。这种方法适用于遍历多维列表或矩阵的情况。 八、MAP函数 map函数可以对列表中的每个元...
Print all items in the list, one by one: thislist = ["apple", "banana", "cherry"] for x in thislist: print(x) Try it Yourself » Learn more about for loops in our Python For Loops Chapter.Loop Through the Index NumbersYou...
This first creates a range corresponding to the indexes in our list (0tolen(colors) - 1). We can loop over this range using Python’s for-in loop (really aforeach). This provides us with the index of each item in ourcolorslist, which is the same way that C-styleforloops work. T...
Iterate String using for loop Iterate List using for loop Iterate Dictionary using for loop What is for loop in Python In Python, the for loop is used to iterate over a sequence such as a list, string, tuple, other iterable objects such as range. With the help of for loop, we can ...
python for loop with index #!/usr/bin/python3 Blue = 17 GREEN = 27 RED = 22 LEDs = list([RED, GREEN, Blue]) for index, led in enumerate(LEDs): print('led = ', LEDs[index]) # 22, 27, 17 # 等价于,start default 0 for index, led in enumerate(LEDs, start=0): print('led...
print(sys.getsizeof(list1)) #getsizeof是sys模块中输出列表占用的内存字节大小的 print(sys.getrefcount(list1)) #getrefcount是sys模块中的用于计算对象的引用个数的 76 2 list = [x**2 for x in range(1,10)] list = list+[20,30] %timeit(1,2,3,4,5,3,2,1,1,3,4,4,5,) ...
# Python List – Append or Add Item cars = ['Ford','Volvo','BMW','Tesla'] cars.append('Audi') print(cars) 执行和输出: 5. 移除元素 移除Python 列表中的某项可以使用列表对象的 remove() 函数,使用该方法语法如下: mylist.remove(thisitem) ...
1.for-loop和列表 在开始使用 for 循环之前,你需要在某个位置存放循环的结果。最好的方法是使用列表(list),顾名思义,它就是一个按顺序存放东西的容器。如 何创建列表: hairs = [‘brown’, ‘blond’, ‘red’] eyes = [‘brown’, ‘blue’, ‘green’] ...
If you omit the start index, the slicing starts from the first element. Similarly, if you omit the last index, the slicing ends at the last element. For example, my_list = ['p', 'r', 'o', 'g', 'r', 'a', 'm'] print("my_list =", my_list) # get a list with items ...
jinlist_1:sht_3[int(i),int(j)].color=(255,25,0)f()list_1=[]foriinrange(30):forjin...