# (Length calculation outside for loop) def test_02_v1(numbers): my_list_length = len(numbers) output_list = [] foriinrange(my_list_length): output_list.append(i * 2) returnoutput_list 通过将列表长度计算移出for循环,加速1.6倍,这...
for循环用于遍历可迭代对象(如列表、元组、字典、集合和字符串)。基本语法如下: forvariableiniterable:# 执行代码块 1. 2. 示例代码 下面的示例使用for循环遍历一个列表,并计算出列表中数字的平方值: numbers=[1,2,3,4,5]squares=[]fornumberinnumbers:squares.append(number**2)print(squares) 1. 2. 3....
Before we wrap up, let’s put your knowledge of Python for loop to the test! Can you solve the following challenge? Challenge: Write a function to calculate the factorial of a number. The factorial of a non-negative integer n is the product of all positive integers less than or equal...
2. 使用for循环遍历可迭代对象 在这里,我们使用for循环来遍历列表numbers。注意,Python 会自动处理计数器的加一过程。 # 使用 for 循环遍历列表fornumberinnumbers: 1. 2. 3. 在每次迭代中执行操作 我们可以在每次迭代中进行某些操作,例如打印出当前的数字。 # 打印当前数字print(number)# 这会输出 1, 2, 3,...
In this article, you’ll learn what is for loop in Python and how to write it. We use a for loop when we want to repeat a code block a fixed number of times. A for loop is a part of a control flow statement which helps you to understand the basics of Python. Also, Solve:...
Baseline: 32.158 ns per loop Improved: 16.040 ns per loop % Improvement: 50.1 % Speedup: 2.00x 可以看到使用列表推导式可以得到2倍速的提高 2、在外部计算长度 如果需要依靠列表的长度进行迭代,请在for循环之外进行计算。 # Baseline version (Inefficient way) ...
for i in range(3): if i == 2: break print(i, end=' ') # 打印0和1 else: print("Loop completed without encountering a 'break' statement.")5.循环控制语句：range()函数：生成一个起始默认为0的序列，通常与for循环一起使用。def print_numbers(n): for i in range(1, n+1): print(i)...
for n in numbers: output.append(n ** 2.5) return output # Improved version # (Using List Comprehension) def test_01_v1(numbers): output = [n ** 2.5 for n in numbers] return output 结果如下: # Summary Of Test Results Baseline: 32.158 ns per loop ...
timeit.timeit(while_loop,number=1))print('for loop\t\t',timeit.timeit(for_loop,number=1))...
Python for loop and while loop #!pyton2#-*- coding:utf-8 -*-forletterin"Python":print"Current letter is:",letter fruits=["apple","mango","pear"]forfruitinfruits:printfruitforindexinrange(len(fruits)):printfruits[index]>python2 test.py...