for outer_variable in outer_sequence: for inner_variable in inner_sequence: # 内层循环体 # 外层循环体 其中,outer_sequence是外层循环遍历的序列,inner_sequence是内层循环遍历的序列。内层循环完全嵌套在外层循环中,内层循环每执行一次,外层循环都会执行其循环体。 二、嵌套循环的常见应用场景 1. 遍历多维数组 ...
在这个示例中,我们首先定义了一个nested_loop函数,用于执行嵌套循环的逻辑。然后,我们定义了一个parallel_nested_loop函数,其中使用concurrent.futures.ThreadPoolExecutor创建了一个线程池,并使用executor.submit方法提交了所有的嵌套循环任务。最后,我们使用concurrent.futures.as_completed方法获取并行计算的结果,并打印出来。
示例:编写一个嵌套的 for 循环程序以在 Python 中打印乘法表。 # outer loop for i in range(1, 11): # nested loop # to iterate from 1 to 10 for j in range(1, 11): # print multiplication print(i * j, end=' ') print() 1. 2. 3. 4. 5. 6. 7. 8. 输出: 在这个程序中,外部...
# (nested lookups using for loop) common_items = [] foriteminlist_1: ifiteminlist_2: common_items.append(item) returncommon_items def test_03_v1(list_1, list_2): # Improved version # (sets to replace nested lookups) s_1 =set(list_1) ...
Nested for loops While loop inside for loop for loop in one line Accessing the index in for loop 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...
Let's look at one example of nested loop in Python: number = [1,2,3] alphabets = ['a','b','c']fornuminnumber:print(num, end=" ")forletterinalphabets:print(letter, end=" ") This will print the following output: 1a b c2a b c3a b c ...
A nested loop is structurally similar tonestedifstatements Python for loop with range() function Python range is one of thebuilt-in functions. When you want the for loop to run for a specific number of times, or you need to specify a range of objects to print out, the range function wo...
在Python中,for循环用以下的格式构造: for[循环计数器]in[循环序列]:[执行循环任务] Copy [循环任务]在循环序列用尽之前,将会将一直被执行。 我们来看看这个例子中,如何用for循环去重复打印一个区间内的所有数字: foriinrange(0,5):print(i) Copy
举出具体例子来 读《head first python》时没有看懂书中这段…学习Python循环，包括FOR、WHILE、Nested...
forlineinrange(1,5):forspaceinrange(4-line):print(" ",end="")forstarinrange(2*line-1):print("*",end="")print() 图四:对应图三 foriinrange(7,0,-2):print(int((7-i)/2)*" ",end="")forjinrange(i):print("*",end="")print() 或者 foriinrange(7,0,-2):forjinrange(in...