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 list, string, tuple, other iterable objects such as range. With ...
#!/usr/bin/python3 Blue = 17 GREEN = 27 RED = 22 LEDs = list([RED, GREEN, Blue]) # enumerate ✅ 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 = ', LE...
for循环通常用于从定义循环边界的变量列表中访问成员变量的索引:for index in range(len(tips)):print(...
StartEnumerateForLoopCheckConditionFetchElementOutputIndex 关系图 在理解enumerate()的过程中,我们可以借助关系图来表示其和for循环结构之间的关系。 FORLOOPstringelementintindexENUMERATEintstartuses 小结 在Python中,for in循环是处理可迭代对象的一种便捷方式,而enumerate()函数则提供了一种轻松获取索引的方案。在实际...
forindexinrange(n):statement 其中，index 被称为循环计数器（loop counter），n 是循环执行的次数。
def circularArrayLoop(self, nums): """ :type nums: List[int] :rtype: bool """ if len(nums) <= 1: return False flag = False for start in range(len(nums)): route = [] indexs = [] while len(route) <= len(nums) + 1: ...
Python for Loops: The Pythonic Way In this quiz, you'll test your understanding of Python's for loop. You'll revisit how to iterate over items in a data collection, how to use range() for a predefined number of iterations, and how to use enumerate() for index-based iteration.Getting...
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. ...
# 假设您有一个列表,您想用反向索引遍历它 my_list=['a','b','c','d','e']#使用range()函数以及列表的长度,你可以创建一个反向的索引序列 reverse_indices=range(len(my_list)-1,-1,-1)# 使用for循环遍历反向索引序列forindexinreverse_indices:print(my_list[index]) ...
forxinrange(2,30,3): print(x) Try it Yourself » Else in For Loop Theelsekeyword in aforloop specifies a block of code to be executed when the loop is finished: Example Print all numbers from 0 to 5, and print a message when the loop has ended: ...