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 (Ineffici...
# (Length calculation outside for loop) def test_02_v1(numbers): my_list_length = len(numbers) output_list = [] for i in range(my_list_length): output_list.append(i * 2) return output_list 通过将列表长度计算移出for循环,加速1.6倍,这个方法可能很少有人知道吧。 # Summary Of Test Res...
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) # (Length calculation inside for loop) defte...
This is where a nested for loop works better. The first loop (parent loop) will go over the words one by one. The second loop (child loop) will loop over the characters of each of the words. words=["Apple","Banana","Car","Dolphin"]forwordinwords:#This loop is fetching word from...
Using a for loop, traverse through all the data elements and after encountering every element, increment the counter variable by 1. 使用for循环,遍历所有数据元素,遇到每个元素后,将计数器变量加1。 Thus, the length of the array will be stored in the counter variable as the variable will represent...
In this tutorial, we’ll cover every facet of theforloop and show you how to use it using various examples. We’ll also go into a few common Python commands and functions likejoin, argv,etc. For more in-depth lessons onforloop and other Python programming concepts, check out this course...
for i in range(len(thislist)): print(thislist[i]) Try it Yourself » The iterable created in the example above is [0, 1, 2].Using a While LoopYou can loop through the list items by using a while loop.Use the len() function to determine the length of the list, then start ...
is a subtlety when the sequence is being modified by the loop (this can only occur for mutable sequences, i.e. lists). An internalcounter is used to keep track of which item is used next, and this is incremented on each iteration. When thiscounter has reached the length of the ...
for循环 #!/usr/bin/python # Filename: for.py foriinrange(1,5): print(i) else: print('The for loop is over') 我们所做的只是提供两个数,range返回一个序列的数。这个序列从第一个数开始到第二个数 为止。例如,range(1,5)给出序列[1, 2, 3, 4]。默认地,range的步长为1。如果我们为rang...
Loop through the letters in the word "banana": forxin"banana": print(x) Try it Yourself » Learn more about For Loops in ourPython For Loopschapter. String Length To get the length of a string, use thelen()function. Example Thelen()function returns the length of a string: ...